User:Tom.Reding/Articles in Category:Astronomy (2/2)
This page is identical in scope to Pages in Category:Astronomy (2/2), except that it omits #Redirects. Compiled: 14:30, 17 December 2020 (UTC).
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List compiled 14:30, 17 December 2019 (UTC)
List compiled 14:30, 17 December 2018 (UTC)
List compiled 18:15, 29 December 2017 (UTC)
List[edit]
- Kosmos 9
- Kosmos 901
- Kosmos 903
- Kosmos 909
- Kosmos 917
- Kosmos 919
- Kosmos 93
- Kosmos 931
- Kosmos 936
- Kosmos 95
- Kosmos 954
- Kosmos 955
- Kosmos 959
- Kosmos 96
- Kosmos 967
- Kosmos 97
- Kosmos 98
- Kosmos 99
- Kosmos-1
- Kosmos-2I
- Kosmos-3
- Kosmos-3M
- Kosovo
- Kostinskiy (crater)
- Kostya (crater)
- Kotoamatsukami
- Kottamia Astronomical Observatory
- Kounotori 2
- Kounotori 3
- Kounotori 4
- Kounotori 5
- Kounotori 6
- Kounotori 7
- Kounotori 8
- Kounotori 9
- Kourou Station
- Koval'skiy (crater)
- Koval'sky (crater)
- Kovalevskaya (crater)
- Koyash
- Kozai mechanism
- Kozyrev (crater)
- Krafft (crater)
- Krafft Arnold Ehricke
- Kraft break
- Kraken Catena
- Kraken Mare
- Kraken galaxy
- Kraków School of Mathematics and Astrology
- Kramarov (crater)
- Kramers (crater)
- Kramers' law
- Krampus Unleashed
- Krampus: The Reckoning
- Krasnaya Zvezda State Enterprise
- Krasnojarsk (meteorite)
- Krasnov (crater)
- Krasovskiy (crater)
- Kraus-type radio telescope
- Krazy's Race of Time
- Kree–Skrull War
- Kreft's dichromaticity index
- Kreiken (crater)
- Krell
- Kremsmünster Abbey
- Kretschmann scalar
- Kreutz sungrazer
- Krewella
- Krieger (crater)
- Kris Ottman Neville
- Kris Sigurdson
- Krishnan Medal
- Kristal Glam Club
- Kristall
- Kristen Parker
- Kristen Rohlfs
- Kristian Lous
- Kristian von Bengtson
- Kristine Kathryn Rusch
- Kristine Kochanski
- Kristine Spekkens
- Kristín Vala Ragnarsdóttir
- Krisztián Sárneczky
- Kriterion Monrovia
- Kriyakramakari
- Krogh (crater)
- Krona space object recognition station
- Krona-N
- Kronberger 61
- Kronid Lyubarsky
- Kronos (spacecraft)
- Kroppedal
- Krotite
- Krrish
- Krrish (franchise)
- Krrish 3
- Krtin Nithiyanandam
- Kruger 60
- Krull (film)
- Krun Macula
- Krusenstern (crater)
- Kruskal–Szekeres coordinates
- Kryal
- Krylov (crater)
- Krypton (TV series)
- Krypton (comics)
- Krysis
- Kryten (Red Dwarf)
- Krytie TV
- Krytron
- Kryštofovo Údolí astronomical clock
- Krzysztof Stanek
- Kuafu project
- Kuan Han-Ch'ing (crater)
- Kubo and the Two Strings
- Kubrick Mons
- Kueyen
- Kuffner Observatory
- Kufra (crater)
- Kugelblitz (astrophysics)
- Kugler (crater)
- Kuhn (crater)
- Kuiper (Martian crater)
- Kuiper (Mercurian crater)
- Kuiper (lunar crater)
- Kuiper Airborne Observatory
- Kuiper Systems
- Kuiper belt
- Kukri Peneplain
- Kulik (crater)
- Kulthum (crater)
- Kuma Kogen Astronomical Observatory
- Kumbha (month)
- Kumeyaay astronomy
- Kumiko Goto-Azuma
- Kumulipo
- Kundt (crater)
- Kundt spacetime
- Kunioki Mima
- Kunisada (crater)
- Kuniumi
- Kuniyoshi (crater)
- Kunlun Dark Universe Survey Telescope
- Kunowsky (Martian crater)
- Kunowsky (lunar crater)
- Kunstformen der Natur
- Kuo Shou Ching (crater)
- Kuppe
- Kurchatov (crater)
- Kurd Kisshauer
- Kurosawa (crater)
- Kurs (docking navigation system)
- Kursk crater
- Kurt Adelberger
- Kurt H. Debus
- Kurt Lambeck
- Kurt Neumann (director)
- Kurt Wimmer
- Kushyar Gilani
- Kusumbai Motichand Planetarium
- Kutch Lacuna
- Kuterastan
- Kuu
- Kuutar
- Kuwait Space Rocket
- Kuznetsov Design Bureau
- Kušuḫ
- Kvant-1
- Kvant-2
- Kvistaberg Observatory
- Kwaheri
- Kwangmyŏngsŏng program
- Kwangmyŏngsŏng-1
- Kwangmyŏngsŏng-2
- Kwangmyŏngsŏng-3
- Kwangmyŏngsŏng-3 Unit 2
- Kwangmyŏngsŏng-4
- Kwatsi Alibaruho
- Kweilin Street Night Market
- KySat-1
- Kyaukkyan Fault
- Kyiv Planetarium
- Kyle Valenti
- Kylo Ren
- Kyl–Bingaman Amendment
- Kyojuu Tokusou Juspion
- Kyongae Chang
- Kyoto Prize in Basic Sciences
- Kyr
- Kyrgyzstan
- Kyril Bonfiglioli
- Kystagerparken
- Kyubey
- Kyung Hee Astronomical Observatory
- Kyōryū Sentai Zyuranger
- Kyōsai (crater)
- Kzin
- Kármán line
- Károly Nagy
- Kärdla crater
- Kärlekens språk
- Kästner (crater)
- Kérdik
- König (crater)
- Kālidāsā (crater)
- Kārlis Šteins
- Kōichirō Tomita
- Kōshō (crater)
- Kōyō Kawanishi
- Kʼatun
- Kʼin
- Kʼàakʼ Chiʼ
- Kṛttikā
- L 1159-16
- L 97-12
- L Carinae
- L Puppis
- L Velorum
- L band (infrared)
- L'Aigle
- L'Aigle (meteorite)
- L'Astronomie (magazine)
- L'Enchanteur
- L'Institut de Recherche en Astrophysique et Planétologie
- L'International des Feux Loto-Québec
- L'Orphelin de Perdide
- L-3 SmartDeck
- L-shell
- L-type asteroid
- L. Blaine Hammond
- L. Sprague de Camp
- L. V. Vaidyanathan
- L.B. One
- L.O.L.: Lack of Love
- L.S.F. (song)
- L1014
- L1157
- L1448-IRS2E
- L1551 IRS 5
- L183
- L2 Puppis
- L3HARRIS Electron Devices
- L5 Society
- LADEE
- LAE J095950.99+021219.1
- LAGEOS
- LAMMPS
- LAMOST
- LAMOST 1
- LAPLander
- LARES (satellite)
- LARLE crater
- LArIAT
- LB-1
- LBG-2377
- LBN 114.55+00.22
- LBN 140
- LBOZ
- LBQS 1429-008
- LBV 1806-20
- LCROSS
- LE-9
- LED street light
- LEDA 1000714
- LEDA 135657
- LEDA 2108986
- LEDA 74886
- LEDA 83677
- LEDA 89996
- LEGRI
- LEO (spacecraft)
- LEON
- LEROS
- LES-1
- LES-2
- LES-3
- LES-4
- LExEN
- LGM-118 Peacekeeper
- LGM-25C Titan II
- LGM-30 Minuteman
- LGM-30 Minuteman chronology
- LGTE
- LGarde
- LH 95
- LH41-1042
- LH54-425
- LHA 120-N 55
- LHS 1140
- LHS 1140 b
- LHS 1723
- LHS 2520
- LHS 288
- LHS 292
- LHS 3844 b
- LHS 6343
- LI-900
- LIDAX
- LIGO
- LIGO Scientific Collaboration
- LINUS (fusion experiment)
- LISA Pathfinder
- LK (spacecraft)
- LK-1
- LK-700
- LKS (spacecraft)
- LL Andromedae
- LL Pegasi
- LLNL RISE process
- LM-700
- LMC N49
- LMC195-1
- LN-3 inertial navigation system
- LNAPL transmissivity
- LOCAD
- LOFT
- LOFTI-1
- LOPES (telescope)
- LORAX
- LORUN
- LOWERN
- LP 145-141
- LP 40-365
- LP 658-2
- LP 816-60
- LP 944-20
- LP Andromedae
- LP Aquarii
- LQ Andromedae
- LR91
- LRGB
- LRK
- LRLL 54361
- LS 5039
- LS Canis Majoris
- LS I +61 303
- LS IV-14 116
- LSD: Dream Emulator
- LSPM J0207+3331
- LSR J1835+3259
- LSS 4067
- LT50
- LTT 1445
- LUCID
- LULI
- LV Vulpeculae
- LX-14
- LY Aurigae
- LYRA
- LZ experiment
- La Bestia in calore
- La Brèche
- La Caille (crater)
- La Cañada Observatory
- La Clique
- La Condamine (crater)
- La Coupole (Paris)
- La Galigo
- La Hita Astronomical Observatory
- La Luna (2011 film)
- La Moinerie crater
- La Murta Observatory
- La Nouvelle Athènes
- La Perouse (New Zealand)
- La Plata Astronomical Observatory
- La Posta Astro-Geophysical Observatory
- La Pérouse (crater)
- La Sagra Observatory
- La Silla Observatory
- La Soirée
- La Specola, Padua
- La Superba
- La Trastienda Club
- La poupée
- La poupée de Nuremberg
- La saga de los Aznar
- LaRa
- LaVal's disk-winged bat
- Labarum
- Labeatis Fossae
- Labia Theatre
- Laboratoire Plasma et Conversion d'Energie
- Laboratoire atmosphères, milieux, observations spatiales
- Laboratoire des sciences du climat et de l'environnement
- Laboratori Nazionali del Gran Sasso
- Laboratorio de Energía Solar Termoeléctrica
- Laboratory Cabin Module
- Laboratory frame of reference
- Laboratório Nacional de Energia e Geologia
- Labou Vallis
- Labrador Sea
- Labrador Sea Water
- Labtayt Sulci
- Labyrinth of Evil
- Lac Dodon
- Lacaille 8760
- Lacaille 9352
- Lacaille 9352 c
- Lacchini (crater)
- Lacerta
- Lacerta in Chinese astronomy
- Laceyella
- Laceyella sediminis
- Laceyella tengchongensis
- Lacroix (crater)
- Lacrosse (satellite)
- Lacus Aestatis
- Lacus Autumni
- Lacus Bonitatis
- Lacus Doloris
- Lacus Excellentiae
- Lacus Felicitatis
- Lacus Gaudii
- Lacus Hiemalis
- Lacus Lenitatis
- Lacus Luxuriae
- Lacus Mortis
- Lacus Oblivionis
- Lacus Odii
- Lacus Perseverantiae
- Lacus Solitudinis
- Lacus Somniorum
- Lacus Spei
- Lacus Temporis
- Lacus Timoris
- Lacus Veris
- Lacustrine deposits
- Lada Terra
- Ladder of the Tyrians
- Ladder paradox
- Lade (crater)
- Ladislaus Weinek
- Ladislav Brožek
- Ladoga Lacus
- Ladon Valles
- Lady Bunny
- Lady Catiria
- Lady Cocoa
- Lady Cynthia Asquith
- Lady Miss Kier
- Lady of the Lake
- Laetitia Garriott de Cayeux
- Laevens 1
- Laevens 3
- Lag BaOmer
- Lag deposit
- Lagalla (crater)
- Laghu Parashari
- Lagna
- Lagoon
- Lagoon Nebula
- Lagos bat lyssavirus
- Lagrange (crater)
- Lagrange (spacecraft)
- Lagrange point
- Lagrange point colonization
- Lahaina Noon
- Lahar
- Laidback Luke
- Laika
- Laimosphere
- Laird A. Thompson
- Lajos Jánossy
- Lake
- Lake Afton Public Observatory
- Lake Agassiz
- Lake Assal (Djibouti)
- Lake Baikal
- Lake Bosumtwi
- Lake Cheko
- Lake Cities (train)
- Lake Elgygytgyn
- Lake Hudson State Recreation Area
- Lake Komi
- Lake Lappajärvi
- Lake Lawrence erratic
- Lake Murray meteorite
- Lake Nemi
- Lake North Pole
- Lake Parime
- Lake Shore Limited
- Lake Shore Limited (New York Central Railroad train)
- Lake Souris
- Lake Tharthar
- Lake Vostok
- Lake Wanapitei
- Lake Yanisyarvi
- Lake ball
- Lake capture
- Lake of fire
- Lakes of Titan
- Lakes on Mars
- Lakshmi Planum
- Lal Kitab
- Lalande (crater)
- Lalande 21185
- Lalande Prize
- Lalla
- Lallemand (crater)
- Lamarck (crater)
- Lamb & Flag, Oxford
- Lamb (crater)
- Lamb Hotel, Eccles
- Lamb Hotel, Nantwich
- Lambda (rocket family)
- Lambda Andromedae
- Lambda Aquarii
- Lambda Aquilae
- Lambda Arae
- Lambda Arietis
- Lambda Aurigae
- Lambda Boötis
- Lambda Boötis star
- Lambda Caeli
- Lambda Cancri
- Lambda Canis Majoris
- Lambda Capricorni
- Lambda Cassiopeiae
- Lambda Centauri
- Lambda Cephei
- Lambda Ceti
- Lambda Chamaeleontis
- Lambda Columbae
- Lambda Coronae Australis
- Lambda Coronae Borealis
- Lambda Crateris
- Lambda Crucis
- Lambda Cygni
- Lambda Draconis
- Lambda Eridani
- Lambda Eridani variable
- Lambda Fornacis
- Lambda Geminorum
- Lambda Gruis
- Lambda Herculis
- Lambda Horologii
- Lambda Hydrae
- Lambda Leonis
- Lambda Leporis
- Lambda Librae
- Lambda Lupi
- Lambda Lyrae
- Lambda Mensae
- Lambda Muscae
- Lambda Normae
- Lambda Octantis
- Lambda Ophiuchi
- Lambda Orionis Cluster
- Lambda Pavonis
- Lambda Pegasi
- Lambda Persei
- Lambda Phoenicis
- Lambda Pictoris
- Lambda Piscis Austrini
- Lambda Piscium
- Lambda Pyxidis
- Lambda Sagittarii
- Lambda Scorpii
- Lambda Sculptoris
- Lambda Serpentis
- Lambda Tauri
- Lambda Telescopii
- Lambda Tucanae
- Lambda Ursae Majoris
- Lambda Ursae Minoris
- Lambda Velorum
- Lambda Virginis
- Lambda-CDM model
- Lambda1 Phoenicis
- Lambda1 Sculptoris
- Lambda1 Tucanae
- Lambda2 Fornacis
- Lambda2 Sculptoris
- Lambda2 Tucanae
- Lambdavacuum solution
- Lambert (Martian crater)
- Lambert (lunar crater)
- Lambert's cosine law
- Lambert's problem
- Lambertian reflectance
- Lambing Season
- Lamb–Mössbauer factor
- Lame Horse fire
- Lamia
- Lamont (Martian crater)
- Lamont (lunar crater)
- Lamont–Doherty Earth Observatory
- Lamont–Hussey Observatory
- Lampland (Martian crater)
- Lampland (lunar crater)
- Lamplighter
- Lamproite
- Lamèch (crater)
- Lamé (crater)
- Lanalhue Fault
- Lance Bass
- Lance Olsen
- Lancelot-Grail
- Land
- Land (journal)
- Land Launch
- Land Remote-Sensing Commercialization Act of 1984
- Land Suitability classification
- Land allocation decision support system
- Land and water hemispheres
- Land bridge
- Land change modeling
- Land cover
- Land degradation
- Land drainage (disambiguation)
- Land drainage in the United Kingdom
- Land drains
- Land ethic
- Land loss
- Land of Illusion Starring Mickey Mouse
- Land of Manu
- Land of the Dead
- Land reclamation
- Land restoration
- Land stewardship
- Land surface models (climate)
- LandSpace
- Landau (crater)
- Landau damping
- Lander (crater)
- Lander (spacecraft)
- Lander (video game)
- Landfarming
- Landfill liner
- Landform
- Landing footprint
- Landlocked country
- Landmapper
- Landmark Aviation
- Landmark Theatre (Syracuse, New York)
- Landmass
- Lando Calrissian
- Landon Curt Noll
- Landor Theatre
- Landsat 1
- Landsat 2
- Landsat 3
- Landsat 4
- Landsat 5
- Landsat 6
- Landsat 7
- Landsat 8
- Landsat 9
- Landsat Island
- Landsat program
- Landscape
- Landscape architecture
- Landscape ecology
- Landscape epidemiology
- Landscape limnology
- Landscape zodiac
- Landslide
- Landslide classification
- Landslides (journal)
- Landsteiner (crater)
- Lane (crater)
- Lane–Emden equation
- Lange (crater)
- Langemak (crater)
- Langevin (crater)
- Langkawi National Observatory
- Langley (crater)
- Langley Research Center
- Langley extrapolation
- Langmuir (crater)
- Langmuir (unit)
- Langmuir circulation
- Langmuir probe
- Langrenus (crater)
- Language of Love
- Languages in Star Wars
- Laniakea Supercluster
- Lansberg (crater)
- Laomedeia
- Laos
- Lapan-TUBsat
- Lapilli
- Lapin Agile
- Lapis Lacedaemonius
- Laplace limit
- Laplace plane
- Laplace-P
- Laplace–Runge–Lenz vector
- Laporte rule
- Lapworth Medal
- Lara (character)
- Lara (lunar crater)
- Laramidia
- Laran
- Large Angle and Spectrometric Coronagraph
- Large Aperture Experiment to Detect the Dark Ages
- Large Apparatus studying Grand Unification and Neutrino Astrophysics
- Large Binocular Telescope
- Large Hadron Collider
- Large Helical Device
- Large High Altitude Air Shower Observatory
- Large Interferometer For Exoplanets
- Large Lakes Observatory
- Large Latin American Millimeter Array
- Large Magellanic Cloud
- Large Millimeter Telescope
- Large Molecule Heimat
- Large Novosibirsk Planetarium
- Large Plasma Device
- Large Sagittarius Star Cloud
- Large Ultraviolet Optical Infrared Surveyor
- Large Underground Xenon experiment
- Large Volume Detector
- Large Zenith Telescope
- Large extra dimensions
- Large igneous province
- Large low-shear-velocity provinces
- Large marine ecosystem
- Large quasar group
- Large woody debris
- Large-eared slit-faced bat
- Large-scale coastal behaviour
- Larissa (moon)
- Lark (person)
- Lark (train)
- Larkin Kerwin
- Larklight
- Larmor (crater)
- Larmor precession
- Larrocha (crater)
- Larry Blamire
- Larry Gladney
- Larry LaRose
- Larry Levan
- Larry McCaffery
- Larry Shaw (editor)
- Larry Soderblom
- Larry Tee
- Larry Vincent
- Larry W. Esposito
- Larry Wilmore
- Larry Woodard
- Larry's Lookout
- Lars Bildsten
- Lars Hernquist
- Lars Lindberg Christensen
- Las Brisas Observatory
- Las Campanas Observatory
- Las Campanas Redshift Survey
- Las Cumbres Observatory
- Las Vegas Bloodbath
- Lascaris War Rooms
- Laser Airborne Depth Sounder Flight RAN
- Laser Communications Relay Demonstration
- Laser Doppler imaging
- Laser Doppler velocimetry
- Laser Doppler vibrometer
- Laser Dynamic Range Imager
- Laser Inertial Fusion Energy
- Laser Interferometer Space Antenna
- Laser SETI
- Laser ablation
- Laser ablation synthesis in solution
- Laser absorption spectrometry
- Laser accelerometer
- Laser airborne depth sounder
- Laser broom
- Laser communication in space
- Laser diffraction analysis
- Laser guide star
- Laser propulsion
- Laser scanning at Stonehenge
- Laser schlieren deflectometry
- Laser star model of quasars
- Laser-based angle-resolved photoemission spectroscopy
- Laser-induced breakdown spectroscopy
- Laser-induced fluorescence
- Laser-induced incandescence
- Laserblast
- Lasham Airfield
- Lassell (Martian crater)
- Lassell (lunar crater)
- Lassina Zerbo
- Last (crater)
- Last Call (1991 film)
- Last Chance (Mars)
- Last Contact
- Last Duel (video game)
- Last House on Dead End Street
- Last Man Running
- Last Summer
- Last and First Men
- Late Elongated Hypocotyl
- Late Heavy Bombardment
- Late Night America
- Late Night Republic
- Late Night with Conan O'Brien
- Late Night with David Letterman
- Late Night with Jimmy Fallon
- Late Paleozoic icehouse
- Late Ruker orogeny
- Late Show Top Ten List
- Late Show with David Letterman
- Late night television in the United States
- Late-night talk show
- Later life of Isaac Newton
- Lateral hypothalamus
- Laterite
- Lateritic nickel ore deposits
- Latham Withall
- Lathe of Heaven (film)
- Latin American Journal of Sedimentology and Basin Analysis
- Latite
- Latitude
- Latitude dependent mantle
- Latosol
- Latvian names in space
- Lau (crater)
- Laue (crater)
- Laughing owl
- Launch America
- Launch Complex 39 Press Site
- Launch Services Alliance
- Launch Services Program
- Launch Unit
- Launch Vehicle Digital Computer
- Launch and Early Orbit phase
- Launch commit criteria
- Launch escape system
- Launch loop
- Launch service provider
- Launch status check
- Launch vehicle
- Launch vehicle system tests
- Launch window
- LauncherOne
- Laura Baudis
- Laura Crispini
- Laura Ferrarese
- Laura Kerber
- Laura Mersini-Houghton
- Laura Quilter
- Laura's Star
- Laurance Doyle
- Laurel Clark
- Laurel L. Wilkening
- Lauren Hutton
- Laurence E. Nyquist
- Laurence E. Peterson
- Laurence McKinley Gould
- Laurent Cassegrain
- Laurent Nottale
- Laurentian River System
- Laurentian Upland
- Laurentius Paulinus Gothus
- Laurie Arms
- Laurie Leshin
- Laurie Rousseau-Nepton
- Lauritsen (crater)
- Lauro Moscardini
- Lava field
- Lava filter
- Lava planet
- Lava tube
- Lavanttal Fault
- Lavender Castle
- Laveran (crater)
- Lavo Čermelj
- Lavoisier (crater)
- Law label
- Law of included fragments
- Law of superposition
- Lawn Hill crater
- Lawrence (crater)
- Lawrence Blair
- Lawrence H. Aller
- Lawrence J. DeLucas
- Lawrence Kestenbaum
- Lawrence Krauss
- Lawrence Livermore National Laboratory
- Lawrence Parsons, 4th Earl of Rosse
- Laws Observatory
- Lawson J. Deming
- Lawson criterion
- Laxness (crater)
- Layo & Bushwacka!
- Lazarus (musical)
- Lazarus comet
- Lazor Wulf
- Le Baiser Salé
- Le Boeuf sur le Toit (cabaret)
- Le Castle Vania
- Le Caveau de la Huchette
- Le Chat Noir
- Le Chat Qui Pêche
- Le Club
- Le Duc des Lombards
- Le Gentil (crater)
- Le Gerny's
- Le Grand Blond avec un show sournois
- Le Lido
- Le Monnier (crater)
- Le Palace
- Le Pustra
- Le Queen
- Le Sage's theory of gravitation
- Le Train Bleu
- Le Verrier (Martian crater)
- Le Verrier (lunar crater)
- Le voyage dans la lune (album)
- Le voyage dans la lune (operetta)
- LeRoy E. Cain
- LeRoy E. Doggett Prize
- Leachate
- Leaching (agriculture)
- Leaching (pedology)
- Leaching model (soil)
- Lead (geology)
- Lead paint
- Lead safe work practices
- Lead star
- Leader (spark)
- Leadhills Supergroup
- Leaf area index
- Leaf mold
- Leakey (crater)
- Lean (drug)
- Leanne Armand
- Leap year problem
- Leap year starting on Friday
- Leap year starting on Saturday
- Leap year starting on Sunday
- Leap year starting on Thursday
- Leap year starting on Tuesday
- Learning the World
- Learning to Fly (Pink Floyd song)
- Least long-fingered bat
- Leather Bottle, Earlsfield
- Leather Goddesses of Phobos
- Leather Goddesses of Phobos 2: Gas Pump Girls Meet the Pulsating Inconvenience from Planet X!
- Leave It Alone (Broken Bells song)
- Leave No Trace
- Leave the gate as you found it
- Leaverite
- Leavitt (crater)
- Lebanese space program
- Lebedev (crater)
- Lebedinskiy (crater)
- Lebesgue (crater)
- Lechatelierite
- Leda (moon)
- Ledoyom
- Lee (crater)
- Lee Anne Willson
- Lee Archambault
- Lee Gold
- Lee Hoffman
- Lee J. Ames
- Lee Morin
- Lee Moyer
- Lee Observatory
- Lee Roy Mitchell
- Lee Samuel Finn
- Lee Smolin
- Leela (Futurama)
- Leeroy Thornhill
- Leeuwenhoek (crater)
- Legacy Trilogy
- Legacy of the Force
- Legacy sediment
- Legal status of striptease
- Legend of Trentren Vilu and Caicai Vilu
- Legend of the Galactic Heroes
- Legenda (satellite system)
- Legendre (crater)
- Legion (Red Dwarf)
- Lego Batman 3: Beyond Gotham
- Lego Dimensions
- Lego Space
- Lego Star Wars II: The Original Trilogy
- Lego Star Wars III: The Clone Wars
- Lego Star Wars: Bombad Bounty
- Lego Star Wars: The Complete Saga
- Lego Star Wars: The Force Awakens
- Lego Star Wars: The Quest for R2-D2
- Lego Star Wars: The Skywalker Saga
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- Legs (Chinese constellation)
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- Lehmann (lunar crater)
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- Lemon Slice Nebula
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- Len Cormier
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- Length measurement
- Lenka Kotková
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- Lenus
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- Leo A
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- Leonids
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- Leprechaun 4: In Space
- Leptogenesis
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- Lesser Antillean funnel-eared bat
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- Life (2017 film)
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- Liquid Scintillator Neutrino Detector
- Liquid air
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- Lis Brack-Bernsen
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- List of 20th-century lunar eclipses
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- List of Abell clusters
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- List of Alien (franchise) novels
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- List of American late night talk show hosts
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- List of Arabic star names
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- List of Art Deco theaters in Metro Manila
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- List of Astronomy Outreach Resources in Europe
- List of Aten asteroids
- List of Atlas launches
- List of Atlas launches (1957–1959)
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- List of Atlas launches (1970–1979)
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- List of Atlas launches (1990–1999)
- List of Atlas launches (2000–2009)
- List of Atlas launches (2010–2019)
- List of Atlas launches (2020–2029)
- List of Balkan endemic plants
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- List of Bomberman video games
- List of Buck Rogers comic strips
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- List of Buran missions
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- List of Cowboy Bebop chapters
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- List of CubeSats
- List of Darkover books
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- List of Electron launches
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- List of Falcon 9 and Falcon Heavy launches
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- List of Firefly (TV series) characters
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- List of GLONASS satellites
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- List of Global Boundary Stratotype Sections and Points
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- List of H-II series and H3 launches
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- List of Halloween retailers
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- List of Halo media
- List of Hawkman enemies
- List of He-Man and the Masters of the Universe (2002 TV series) episodes
- List of He-Man and the Masters of the Universe characters
- List of He-Man and the Masters of the Universe episodes
- List of Heads of Roscosmos
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- List of Jewish astronauts
- List of Jupiter events
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- List of Jupiter trojans (Greek camp) (100001–200000)
- List of Jupiter trojans (Greek camp) (1–100000)
- List of Jupiter trojans (Greek camp) (200001–300000)
- List of Jupiter trojans (Greek camp) (300001–400000)
- List of Jupiter trojans (Greek camp) (400001–500000)
- List of Jupiter trojans (Greek camp) (500001–600000)
- List of Jupiter trojans (Trojan camp)
- List of Jupiter trojans (Trojan camp) (100001–200000)
- List of Jupiter trojans (Trojan camp) (1–100000)
- List of Jupiter trojans (Trojan camp) (200001–300000)
- List of Jupiter trojans (Trojan camp) (300001–400000)
- List of Jupiter trojans (Trojan camp) (400001–500000)
- List of Jupiter trojans (Trojan camp) (500001–600000)
- List of Jupiter-crossing minor planets
- List of Kepler exoplanet candidates in the habitable zone
- List of Kirby characters
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- List of Kosmos satellites
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- List of Late Night with Jimmy Fallon episodes
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- List of Launch Services Program launches
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- List of Mars analogs
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- List of Martha Speaks episodes
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- List of Mass Effect media
- List of Members of the International Hydrographic Organization
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- List of Merlin characters
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- List of Metroid media
- List of Mighty Morphin Power Rangers characters
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- List of Mir expeditions
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- List of NGC objects
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- List of NGC objects (2001–3000)
- List of NGC objects (3001–4000)
- List of NGC objects (4001–5000)
- List of NGC objects (5001–6000)
- List of NGC objects (6001–7000)
- List of NGC objects (7001–7840)
- List of NOAA satellites
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- List of Nakshatras
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- List of New Horizons topics
- List of Oko satellites
- List of Old Rossallians
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- List of Outlaw Star chapters
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- List of PSLV launches
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- List of Penrose Medal winners
- List of Pern books
- List of Power Rangers Turbo episodes
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- List of Predator (franchise) novels
- List of Progress missions
- List of Proton launches
- List of Proton launches (1965–1969)
- List of Proton launches (1970–1979)
- List of Proton launches (1980–1989)
- List of Proton launches (1990–1999)
- List of Proton launches (2000–2009)
- List of Proton launches (2010–2019)
- List of Proton launches (2020–2029)
- List of Puerto Ricans in the United States Space Program
- List of R-7 launches
- List of R-7 launches (1957–1959)
- List of R-7 launches (1960–1964)
- List of R-7 launches (1965–1969)
- List of R-7 launches (1970–1974)
- List of R-7 launches (1975–1979)
- List of R-7 launches (1980–1984)
- List of R-7 launches (1985–1989)
- List of R-7 launches (1990–1994)
- List of R-7 launches (1995–1999)
- List of R-7 launches (2000–2004)
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- List of Red Dwarf episodes
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- List of Russian aerospace engineers
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- List of Saga story arcs
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- List of Satish Dhawan Space Centre launches
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- List of She-Ra: Princess of Power and She-Ra and the Princesses of Power characters
- List of She-Ra: Princess of Power episodes
- List of Shuttle Carrier Aircraft flights
- List of Slovenian astronomers
- List of Solar System extremes
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- List of Space Invaders video games
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- List of Space: 1999 books and other media
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- List of Star Fox characters
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- List of Star Trek novels
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- List of Star Trek: The Original Series episodes
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- List of Star Wars artists
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- List of Stargate Atlantis episodes
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- List of Starship flights
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- List of The Late Show with Stephen Colbert episodes
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- List of Thor and Delta launches
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- List of Thor and Delta launches (1960–1969)
- List of Thor and Delta launches (1970–1979)
- List of Thor and Delta launches (1980–1989)
- List of Thor and Delta launches (1990–1999)
- List of Thor and Delta launches (2000–2009)
- List of Thor and Delta launches (2010–2019)
- List of Thor and Delta launches (2020–2029)
- List of Titan launches
- List of Triangulum's suspected satellite galaxies
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- List of Uranus-crossing minor planets
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- List of Warhammer 40,000 novels
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- List of X-15 flights
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- List of Yoshinobu Launch Complex launches
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- List of accolades received by Avatar
- List of active Solar System probes
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- List of aerospace engineers
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- List of alleged extraterrestrial beings
- List of ancient Roman fasti
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- List of archaeoastronomical sites by country
- List of areas of chaos terrain on Mars
- List of art cinemas in New York City
- List of articles related to the Sun
- List of artifacts significant to archaeoastronomy
- List of artificial objects in heliocentric orbit
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- List of artificial objects on Venus
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- List of artificial radiation belts
- List of asteroid close approaches to Earth
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- List of asteroid close approaches to Earth in 2012
- List of asteroid close approaches to Earth in 2013
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- List of asteroid close approaches to Earth in 2015
- List of asteroid close approaches to Earth in 2016
- List of asteroid close approaches to Earth in 2017
- List of asteroid close approaches to Earth in 2018
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- List of asteroid-discovering observatories
- List of asteroids in astrology
- List of astrologers
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- List of astrometric solvers
- List of astronauts by first flight
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- List of astronauts by year of selection
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- List of astronomers
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- List of awards and nominations received by Stargate Atlantis
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- List of awards and nominations received by Stephen Colbert
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- List of bars
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- List of bats
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- List of black holes
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- List of bogs
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- List of bouncers
- List of box office records set by Avatar
- List of brightest natural objects in the sky
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- List of brown dwarfs
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- List of catenae on Mars
- List of cave monasteries
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- List of circles of latitude
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- List of comets bearing names
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- List of comets discovered by the LINEAR project
- List of comets with no meaningful orbit
- List of comic books based on Star Trek: The Next Generation
- List of commanders of the International Space Station
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- List of contributors to general relativity
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- List of craters in the Solar System
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- List of craters on Europa
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- List of craters on Mars
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- List of craters on Mathilde
- List of craters on Mercury
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- List of craters on minor planets
- List of craters on the Moon
- List of craters on the Moon: A–B
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- List of craters with ray systems
- List of creation myths
- List of crew of the International Space Station
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- List of crewed spacecraft
- List of cumulative spacewalk records
- List of cycles
- List of dark nebulae
- List of deep fields
- List of deserts by area
- List of diffuse nebulae
- List of directly imaged exoplanets
- List of diving hazards and precautions
- List of dream diaries
- List of dreams
- List of drive-in theaters
- List of drive-in theatres in Australia
- List of earth and atmospheric sciences journals
- List of earth sciences awards
- List of environmental journals
- List of equations in gravitation
- List of exceptional asteroids
- List of exoplanet extremes
- List of exoplanet firsts
- List of exoplanet search projects
- List of exoplanetary host stars
- List of exoplanets detected by microlensing
- List of exoplanets detected by radial velocity
- List of exoplanets detected by timing
- List of exoplanets discovered before 2000
- List of exoplanets discovered between 2000–2009
- List of exoplanets discovered in 2010
- List of exoplanets discovered in 2011
- List of exoplanets discovered in 2012
- List of exoplanets discovered in 2013
- List of exoplanets discovered in 2014
- List of exoplanets discovered in 2015
- List of exoplanets discovered in 2016
- List of exoplanets discovered in 2017
- List of exoplanets discovered in 2018
- List of exoplanets discovered in 2019
- List of exoplanets discovered in 2020
- List of exoplanets discovered using the Kepler space telescope
- List of extrasolar candidates for liquid water
- List of extraterrestrial dune fields
- List of extraterrestrial memorials
- List of extraterrestrial orbiters
- List of extraterrestrial volcanoes
- List of fast radio bursts
- List of fast rotators (minor planets)
- List of fault zones
- List of female spacefarers
- List of fen plants
- List of fiction employing parallel universes
- List of fictional bars and pubs
- List of fictional doomsday devices
- List of fictional extraterrestrials
- List of fictional galactic communities
- List of fictional space stations
- List of fictional spacecraft
- List of films featuring eclipses
- List of films featuring extraterrestrials
- List of films featuring space stations
- List of films set around Halloween
- List of films set on Mars
- List of fireworks accidents and incidents
- List of flood basalt provinces
- List of foreign satellites launched by India
- List of former planets
- List of former public houses and coffeehouses in Boston
- List of fossil sites
- List of fossiliferous stratigraphic units in Angola
- List of fossiliferous stratigraphic units in Antarctica
- List of fossiliferous stratigraphic units in Botswana
- List of fossiliferous stratigraphic units in Cameroon
- List of fossiliferous stratigraphic units in Cape Verde
- List of fossiliferous stratigraphic units in Central America
- List of fossiliferous stratigraphic units in Djibouti
- List of fossiliferous stratigraphic units in Ecuador
- List of fossiliferous stratigraphic units in Eritrea
- List of fossiliferous stratigraphic units in Ethiopia
- List of fossiliferous stratigraphic units in Guyana
- List of fossiliferous stratigraphic units in the Democratic Republic of the Congo
- List of fracture zones
- List of free geology software
- List of fusion experiments
- List of fusion power technologies
- List of future astronomical events
- List of galaxies
- List of galaxies named after people
- List of galaxies with richest globular cluster systems
- List of galaxy groups and clusters
- List of gamma-ray bursts
- List of gases
- List of geochronologic names
- List of geography awards
- List of geological features on 21 Lutetia
- List of geological features on 433 Eros
- List of geological features on Ariel
- List of geological features on Callisto
- List of geological features on Ceres
- List of geological features on Charon
- List of geological features on Dione
- List of geological features on Enceladus
- List of geological features on Europa
- List of geological features on Ganymede
- List of geological features on Hyperion
- List of geological features on Iapetus
- List of geological features on Ida and Dactyl
- List of geological features on Io
- List of geological features on Mercury
- List of geological features on Mimas
- List of geological features on Miranda
- List of geological features on Oberon
- List of geological features on Pluto
- List of geological features on Rhea
- List of geological features on Tethys
- List of geological features on Titan
- List of geological features on Titania
- List of geological features on Triton
- List of geological features on Venus
- List of geological features on Vesta
- List of geological phenomena
- List of geologists
- List of geology awards
- List of geomagnetic reversals
- List of geophysicists
- List of geophysics awards
- List of geoscience organizations
- List of glaciers
- List of glaciologists
- List of globular clusters
- List of government space agencies
- List of gravitational wave observations
- List of gravitationally rounded objects of the Solar System
- List of greenstone belts
- List of haunted attractions
- List of heaviest spacecraft
- List of heliophysics missions
- List of highest astronomical observatories
- List of highest features on Earth
- List of highest mountains on Earth
- List of historic properties in Avondale, Arizona
- List of historical maps
- List of hot springs in Japan
- List of hottest stars
- List of human spaceflight programs
- List of human spaceflights
- List of human spaceflights to Mir
- List of human spaceflights to Salyut space stations
- List of human spaceflights to the International Space Station
- List of human spaceflights, 1961–1970
- List of human spaceflights, 1971–1980
- List of human spaceflights, 1981–1990
- List of human spaceflights, 1991–2000
- List of human spaceflights, 2001–2010
- List of human spaceflights, 2011–present
- List of hydrodynamic instabilities named after people
- List of hyperbolic comets
- List of hypothetical Solar System objects
- List of ice cores
- List of impact craters in Africa
- List of impact craters in Antarctica
- List of impact craters in Asia and Russia
- List of impact craters in Australia
- List of impact craters in Europe
- List of impact craters in North America
- List of impact craters in South America
- List of impact craters on Earth
- List of important publications in geology
- List of inductees in the International Space Hall of Fame
- List of instrument-resolved minor planets
- List of instruments used in toxicology
- List of interplanetary voyages
- List of interstellar and circumstellar molecules
- List of interstellar radio messages
- List of investigational sleep drugs
- List of items smuggled into space
- List of jazz clubs in Paris
- List of jazz venues
- List of karst areas
- List of landforms
- List of landings on extraterrestrial bodies
- List of landslides
- List of language interpreters in fiction
- List of large optical telescopes
- List of large volcanic eruptions
- List of largest cosmic structures
- List of largest craters in the Solar System
- List of largest exoplanets
- List of largest infrared telescopes
- List of largest lakes and seas in the Solar System
- List of largest meteorites on Earth
- List of largest nebulae
- List of largest optical reflecting telescopes
- List of largest optical refracting telescopes
- List of largest optical telescopes historically
- List of largest optical telescopes in the 18th century
- List of largest optical telescopes in the 19th century
- List of largest optical telescopes in the 20th century
- List of largest optical telescopes in the British Isles
- List of largest rifts, canyons and valleys in the Solar System
- List of largest stars
- List of largest volcanic eruptions
- List of late-night American network TV programs
- List of launch complexes
- List of launch vehicle designs
- List of lights
- List of lineae on Europa
- List of locations with a subtropical climate
- List of long-period comets
- List of longest mountain chains on Earth
- List of longest spacewalks
- List of lost lands
- List of lunar craters named for space explorers
- List of lunar deities
- List of lunar features
- List of lunar meteorites
- List of lunar probes
- List of maria on the Moon
- List of media set within one day
- List of medieval Hebrew astronomers
- List of members of the National Academy of Sciences (Human environmental sciences)
- List of meteor air bursts
- List of meteor showers
- List of meteorite minerals
- List of meteorology institutions
- List of microorganisms tested in outer space
- List of microquasars
- List of military rockets
- List of mineralogists
- List of minerals
- List of minerals approved by IMA
- List of minerals by optical properties
- List of minerals named after people
- List of minor planet discoverers
- List of minor planets
- List of minor planets and comets visited by spacecraft
- List of minor planets discovered using the WISE spacecraft
- List of minor planets named after animals and plants
- List of minor planets named after people
- List of minor planets named after places
- List of minor planets named after rivers
- List of minor planets: 100001–101000
- List of minor planets: 10001–11000
- List of minor planets: 1001–2000
- List of minor planets: 101001–102000
- List of minor planets: 102001–103000
- List of minor planets: 103001–104000
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- List of minor planets: 109001–110000
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- List of minor planets: 111001–112000
- List of minor planets: 112001–113000
- List of minor planets: 113001–114000
- List of minor planets: 114001–115000
- List of minor planets: 115001–116000
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- List of minor planets: 117001–118000
- List of minor planets: 118001–119000
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- List of minor planets: 133001–134000
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- List of minor planets: 135001–136000
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- List of minor planets: 137001–138000
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- List of minor planets: 14001–15000
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- List of minor planets: 143001–144000
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- List of minor planets: 147001–148000
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- List of minor planets: 15001–16000
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- List of minor planets: 162001–163000
- List of minor planets: 163001–164000
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- List of minor planets: 17001–18000
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- List of minor planets: 173001–174000
- List of minor planets: 174001–175000
- List of minor planets: 175001–176000
- List of minor planets: 176001–177000
- List of minor planets: 177001–178000
- List of minor planets: 178001–179000
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- List of minor planets: 18001–19000
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- List of minor planets: 183001–184000
- List of minor planets: 184001–185000
- List of minor planets: 185001–186000
- List of minor planets: 186001–187000
- List of minor planets: 187001–188000
- List of minor planets: 188001–189000
- List of minor planets: 189001–190000
- List of minor planets: 190001–191000
- List of minor planets: 19001–20000
- List of minor planets: 191001–192000
- List of minor planets: 192001–193000
- List of minor planets: 193001–194000
- List of minor planets: 194001–195000
- List of minor planets: 195001–196000
- List of minor planets: 196001–197000
- List of minor planets: 197001–198000
- List of minor planets: 198001–199000
- List of minor planets: 199001–200000
- List of minor planets: 1–1000
- List of minor planets: 200001–201000
- List of minor planets: 20001–21000
- List of minor planets: 2001–3000
- List of minor planets: 201001–202000
- List of minor planets: 202001–203000
- List of minor planets: 203001–204000
- List of minor planets: 204001–205000
- List of minor planets: 205001–206000
- List of minor planets: 206001–207000
- List of minor planets: 207001–208000
- List of minor planets: 208001–209000
- List of minor planets: 209001–210000
- List of minor planets: 210001–211000
- List of minor planets: 21001–22000
- List of minor planets: 211001–212000
- List of minor planets: 212001–213000
- List of minor planets: 213001–214000
- List of minor planets: 214001–215000
- List of minor planets: 215001–216000
- List of minor planets: 216001–217000
- List of minor planets: 217001–218000
- List of minor planets: 218001–219000
- List of minor planets: 219001–220000
- List of minor planets: 220001–221000
- List of minor planets: 22001–23000
- List of minor planets: 221001–222000
- List of minor planets: 222001–223000
- List of minor planets: 223001–224000
- List of minor planets: 224001–225000
- List of minor planets: 225001–226000
- List of minor planets: 226001–227000
- List of minor planets: 227001–228000
- List of minor planets: 228001–229000
- List of minor planets: 229001–230000
- List of minor planets: 230001–231000
- List of minor planets: 23001–24000
- List of minor planets: 231001–232000
- List of minor planets: 232001–233000
- List of minor planets: 233001–234000
- List of minor planets: 234001–235000
- List of minor planets: 235001–236000
- List of minor planets: 236001–237000
- List of minor planets: 237001–238000
- List of minor planets: 238001–239000
- List of minor planets: 239001–240000
- List of minor planets: 240001–241000
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- List of minor planets: 243001–244000
- List of minor planets: 244001–245000
- List of minor planets: 245001–246000
- List of minor planets: 246001–247000
- List of minor planets: 247001–248000
- List of minor planets: 248001–249000
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- List of minor planets: 263001–264000
- List of minor planets: 264001–265000
- List of minor planets: 265001–266000
- List of minor planets: 266001–267000
- List of minor planets: 267001–268000
- List of minor planets: 268001–269000
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- List of minor planets: 273001–274000
- List of minor planets: 274001–275000
- List of minor planets: 275001–276000
- List of minor planets: 276001–277000
- List of minor planets: 277001–278000
- List of minor planets: 278001–279000
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- List of minor planets: 280001–281000
- List of minor planets: 28001–29000
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- List of minor planets: 283001–284000
- List of minor planets: 284001–285000
- List of minor planets: 285001–286000
- List of minor planets: 286001–287000
- List of minor planets: 287001–288000
- List of minor planets: 288001–289000
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- List of minor planets: 29001–30000
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- List of minor planets: 292001–293000
- List of minor planets: 293001–294000
- List of minor planets: 294001–295000
- List of minor planets: 295001–296000
- List of minor planets: 296001–297000
- List of minor planets: 297001–298000
- List of minor planets: 298001–299000
- List of minor planets: 299001–300000
- List of minor planets: 300001–301000
- List of minor planets: 30001–31000
- List of minor planets: 3001–4000
- List of minor planets: 301001–302000
- List of minor planets: 302001–303000
- List of minor planets: 303001–304000
- List of minor planets: 304001–305000
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- List of minor planets: 306001–307000
- List of minor planets: 307001–308000
- List of minor planets: 308001–309000
- List of minor planets: 309001–310000
- List of minor planets: 310001–311000
- List of minor planets: 31001–32000
- List of minor planets: 311001–312000
- List of minor planets: 312001–313000
- List of minor planets: 313001–314000
- List of minor planets: 314001–315000
- List of minor planets: 315001–316000
- List of minor planets: 316001–317000
- List of minor planets: 317001–318000
- List of minor planets: 318001–319000
- List of minor planets: 319001–320000
- List of minor planets: 320001–321000
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- List of minor planets: 321001–322000
- List of minor planets: 322001–323000
- List of minor planets: 323001–324000
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- List of minor planets: 326001–327000
- List of minor planets: 327001–328000
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- List of minor planets: 331001–332000
- List of minor planets: 332001–333000
- List of minor planets: 333001–334000
- List of minor planets: 334001–335000
- List of minor planets: 335001–336000
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- List of minor planets: 34001–35000
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- List of minor planets: 343001–344000
- List of minor planets: 344001–345000
- List of minor planets: 345001–346000
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- List of minor planets: 347001–348000
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- List of minor planets: 352001–353000
- List of minor planets: 353001–354000
- List of minor planets: 354001–355000
- List of minor planets: 355001–356000
- List of minor planets: 356001–357000
- List of minor planets: 357001–358000
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- List of minor planets: 364001–365000
- List of minor planets: 365001–366000
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- List of minor planets: 367001–368000
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- List of minor planets: 373001–374000
- List of minor planets: 374001–375000
- List of minor planets: 375001–376000
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- List of minor planets: 383001–384000
- List of minor planets: 384001–385000
- List of minor planets: 385001–386000
- List of minor planets: 386001–387000
- List of minor planets: 387001–388000
- List of minor planets: 388001–389000
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- List of minor planets: 390001–391000
- List of minor planets: 39001–40000
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- List of minor planets: 393001–394000
- List of minor planets: 394001–395000
- List of minor planets: 395001–396000
- List of minor planets: 396001–397000
- List of minor planets: 397001–398000
- List of minor planets: 398001–399000
- List of minor planets: 399001–400000
- List of minor planets: 400001–401000
- List of minor planets: 40001–41000
- List of minor planets: 4001–5000
- List of minor planets: 401001–402000
- List of minor planets: 402001–403000
- List of minor planets: 403001–404000
- List of minor planets: 404001–405000
- List of minor planets: 405001–406000
- List of minor planets: 406001–407000
- List of minor planets: 407001–408000
- List of minor planets: 408001–409000
- List of minor planets: 409001–410000
- List of minor planets: 410001–411000
- List of minor planets: 41001–42000
- List of minor planets: 411001–412000
- List of minor planets: 412001–413000
- List of minor planets: 413001–414000
- List of minor planets: 414001–415000
- List of minor planets: 415001–416000
- List of minor planets: 416001–417000
- List of minor planets: 417001–418000
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- List of minor planets: 420001–421000
- List of minor planets: 42001–43000
- List of minor planets: 421001–422000
- List of minor planets: 422001–423000
- List of minor planets: 423001–424000
- List of minor planets: 424001–425000
- List of minor planets: 425001–426000
- List of minor planets: 426001–427000
- List of minor planets: 427001–428000
- List of minor planets: 428001–429000
- List of minor planets: 429001–430000
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- List of minor planets: 432001–433000
- List of minor planets: 433001–434000
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- List of minor planets: 437001–438000
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- List of minor planets: 443001–444000
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- List of minor planets: 445001–446000
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- List of minor planets: 453001–454000
- List of minor planets: 454001–455000
- List of minor planets: 455001–456000
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- List of minor planets: 458001–459000
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- List of minor planets: 463001–464000
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- List of minor planets: 468001–469000
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- List of minor planets: 473001–474000
- List of minor planets: 474001–475000
- List of minor planets: 475001–476000
- List of minor planets: 476001–477000
- List of minor planets: 477001–478000
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- List of minor planets: 484001–485000
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- List of minor planets: 493001–494000
- List of minor planets: 494001–495000
- List of minor planets: 495001–496000
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- List of minor planets: 497001–498000
- List of minor planets: 498001–499000
- List of minor planets: 499001–500000
- List of minor planets: 500001–501000
- List of minor planets: 50001–51000
- List of minor planets: 5001–6000
- List of minor planets: 501001–502000
- List of minor planets: 502001–503000
- List of minor planets: 503001–504000
- List of minor planets: 504001–505000
- List of minor planets: 505001–506000
- List of minor planets: 506001–507000
- List of minor planets: 507001–508000
- List of minor planets: 508001–509000
- List of minor planets: 509001–510000
- List of minor planets: 510001–511000
- List of minor planets: 51001–52000
- List of minor planets: 511001–512000
- List of minor planets: 512001–513000
- List of minor planets: 513001–514000
- List of minor planets: 514001–515000
- List of minor planets: 515001–516000
- List of minor planets: 516001–517000
- List of minor planets: 517001–518000
- List of minor planets: 518001–519000
- List of minor planets: 519001–520000
- List of minor planets: 520001–521000
- List of minor planets: 52001–53000
- List of minor planets: 521001–522000
- List of minor planets: 522001–523000
- List of minor planets: 523001–524000
- List of minor planets: 524001–525000
- List of minor planets: 525001–526000
- List of minor planets: 526001–527000
- List of minor planets: 527001–528000
- List of minor planets: 528001–529000
- List of minor planets: 529001–530000
- List of minor planets: 530001–531000
- List of minor planets: 53001–54000
- List of minor planets: 531001–532000
- List of minor planets: 532001–533000
- List of minor planets: 533001–534000
- List of minor planets: 534001–535000
- List of minor planets: 535001–536000
- List of minor planets: 536001–537000
- List of minor planets: 537001–538000
- List of minor planets: 538001–539000
- List of minor planets: 539001–540000
- List of minor planets: 540001–541000
- List of minor planets: 54001–55000
- List of minor planets: 541001–542000
- List of minor planets: 542001–543000
- List of minor planets: 543001–544000
- List of minor planets: 544001–545000
- List of minor planets: 545001–546000
- List of minor planets: 546001–547000
- List of minor planets: 55001–56000
- List of minor planets: 56001–57000
- List of minor planets: 57001–58000
- List of minor planets: 58001–59000
- List of minor planets: 59001–60000
- List of minor planets: 60001–61000
- List of minor planets: 6001–7000
- List of minor planets: 61001–62000
- List of minor planets: 62001–63000
- List of minor planets: 63001–64000
- List of minor planets: 64001–65000
- List of minor planets: 65001–66000
- List of minor planets: 66001–67000
- List of minor planets: 67001–68000
- List of minor planets: 68001–69000
- List of minor planets: 69001–70000
- List of minor planets: 70001–71000
- List of minor planets: 7001–8000
- List of minor planets: 71001–72000
- List of minor planets: 72001–73000
- List of minor planets: 73001–74000
- List of minor planets: 74001–75000
- List of minor planets: 75001–76000
- List of minor planets: 76001–77000
- List of minor planets: 77001–78000
- List of minor planets: 78001–79000
- List of minor planets: 79001–80000
- List of minor planets: 80001–81000
- List of minor planets: 8001–9000
- List of minor planets: 81001–82000
- List of minor planets: 82001–83000
- List of minor planets: 83001–84000
- List of minor planets: 84001–85000
- List of minor planets: 85001–86000
- List of minor planets: 86001–87000
- List of minor planets: 87001–88000
- List of minor planets: 88001–89000
- List of minor planets: 89001–90000
- List of minor planets: 90001–91000
- List of minor planets: 9001–10000
- List of minor planets: 91001–92000
- List of minor planets: 92001–93000
- List of minor planets: 93001–94000
- List of minor planets: 94001–95000
- List of minor planets: 95001–96000
- List of minor planets: 96001–97000
- List of minor planets: 97001–98000
- List of minor planets: 98001–99000
- List of minor planets: 99001–100000
- List of minor-planet groups
- List of missions to Mars
- List of missions to Venus
- List of missions to comets
- List of missions to minor planets
- List of missions to the Moon
- List of missions to the outer planets
- List of montes on Venus
- List of most distant supernovae
- List of most luminous stars
- List of most massive black holes
- List of most massive exoplanets
- List of most massive stars
- List of mountains by elevation
- List of mountains on Io
- List of mountains on Mars
- List of mountains on Mars by height
- List of mountains on the Moon
- List of mountains on the Moon by height
- List of movie theater chains
- List of movie theaters
- List of multiplanetary systems
- List of museums and collections at the University of Michigan
- List of named Solar System objects
- List of named minor planets (alphabetical)
- List of named minor planets (numerical)
- List of named minor planets: 100000–149999
- List of named minor planets: 10000–19999
- List of named minor planets: 1000–1999
- List of named minor planets: 150000–199999
- List of named minor planets: 1–999
- List of named minor planets: 200000–249999
- List of named minor planets: 20000–29999
- List of named minor planets: 2000–2999
- List of named minor planets: 250000–299999
- List of named minor planets: 300000–349999
- List of named minor planets: 30000–39999
- List of named minor planets: 3000–3999
- List of named minor planets: 350000–399999
- List of named minor planets: 400000–999999
- List of named minor planets: 40000–49999
- List of named minor planets: 4000–4999
- List of named minor planets: 50000–59999
- List of named minor planets: 5000–5999
- List of named minor planets: 60000–69999
- List of named minor planets: 6000–6999
- List of named minor planets: 70000–79999
- List of named minor planets: 7000–7999
- List of named minor planets: 80000–89999
- List of named minor planets: 8000–8999
- List of named minor planets: 90000–99999
- List of named minor planets: 9000–9999
- List of named minor planets: A
- List of named minor planets: B
- List of named minor planets: C
- List of named minor planets: D
- List of named minor planets: E
- List of named minor planets: F
- List of named minor planets: G
- List of named minor planets: H
- List of named minor planets: I
- List of named minor planets: J
- List of named minor planets: K
- List of named minor planets: L
- List of named minor planets: M
- List of named minor planets: N
- List of named minor planets: O
- List of named minor planets: P
- List of named minor planets: Q
- List of named minor planets: R
- List of named minor planets: S
- List of named minor planets: T
- List of named minor planets: U
- List of named minor planets: V
- List of named minor planets: W
- List of named minor planets: X
- List of named minor planets: Y
- List of named minor planets: Z
- List of names for the Milky Way
- List of national capitals by latitude
- List of natural history dealers
- List of natural phenomena
- List of natural satellites
- List of near-Earth asteroids by distance from Sun
- List of near-Earth object observation projects
- List of near-parabolic comets
- List of nearby stellar associations and moving groups
- List of nearest black holes
- List of nearest bright stars
- List of nearest exoplanets
- List of nearest galaxies
- List of nearest stars and brown dwarfs
- List of nearest terrestrial exoplanet candidates
- List of neutrino experiments
- List of new islands
- List of nicknames used by Stephen Colbert
- List of night deities
- List of night markets in Taiwan
- List of nightclubs in New York City
- List of nightclubs in Sweden
- List of nocturnal animals
- List of nocturnal birds
- List of non-profit space agencies
- List of northernmost items
- List of northernmost settlements
- List of novae in 2018
- List of novae in 2019
- List of novae in the Milky Way galaxy
- List of nuclear power systems in space
- List of numbered comets
- List of objects at Lagrange points
- List of observatory codes
- List of observatory software
- List of ocean circulation models
- List of oil fields
- List of oldest stars
- List of open clusters
- List of ophiolites
- List of optical telescopes
- List of orbital launch systems
- List of orbits
- List of original copies of the Porter Garden Telescope
- List of orogenies
- List of owl species
- List of paleocontinents
- List of paleontologists
- List of parson-naturalists
- List of passive satellites
- List of peninsulas
- List of people who descended to Challenger Deep
- List of people who have walked on the Moon
- List of people with craters of the Moon named after them
- List of periodic comets
- List of periods and events in climate history
- List of permaculture projects
- List of places on land with elevations below sea level
- List of places with columnar jointed volcanics
- List of planet types
- List of planetariums
- List of planetary features with Māori names
- List of planetary flybys
- List of planetary nebulae
- List of planets observed during Kepler's K2 mission
- List of plasma physicists
- List of plasma physics articles
- List of poisonous flowers
- List of poisonous plants
- List of polar-ring galaxies
- List of possible dwarf planets
- List of possible impact structures on Earth
- List of potentially habitable exoplanets
- List of presidents of the American Geophysical Union
- List of principal and guide meridians and base lines of the United States
- List of private spaceflight companies
- List of programs broadcast by Adult Swim
- List of proper names of exoplanets
- List of proper names of stars
- List of proposed Solar System spacecraft
- List of proposed space observatories
- List of protoplanetary nebulae
- List of pubs in Australia
- List of pubs in Dublin (city)
- List of pubs in London
- List of pubs in Sheffield
- List of pubs in the United Kingdom
- List of pubs named Carpenters Arms
- List of quadrangles on Ganymede
- List of quadrangles on Mercury
- List of quadrangles on Venus
- List of quadrangles on the Moon
- List of quantum gravity researchers
- List of quasars
- List of radio telescopes
- List of red dwarfs
- List of reentering space debris
- List of retroreflectors on the Moon
- List of ring galaxies
- List of rivers that have reversed direction
- List of rock textures
- List of rock types
- List of rocket experiments on Zingst
- List of rocket launch sites
- List of rocket stages
- List of rockets launched from Esrange
- List of rockets of the United States
- List of rocks on Mars
- List of rogue waves
- List of rovers on extraterrestrial bodies
- List of sandstones
- List of saros series for lunar eclipses
- List of satellite pass predictors
- List of satellites in geosynchronous orbit
- List of satellites which have provided data on Earth's magnetosphere
- List of science fiction authors
- List of science fiction editors
- List of sea stacks
- List of seas
- List of seismic faults in Mexico
- List of semiregular variable stars
- List of sequenced archaeal genomes
- List of shields and cratons
- List of sinkholes
- List of slow rotators (minor planets)
- List of smallest exoplanets
- List of smallest stars
- List of software for astronomy research and education
- List of soil scientists
- List of solar deities
- List of solar eclipses visible from Australia
- List of solar eclipses visible from China
- List of solar eclipses visible from Israel
- List of solar eclipses visible from Russia
- List of solar eclipses visible from Ukraine
- List of solar eclipses visible from the Philippines
- List of solar eclipses visible from the United Kingdom
- List of solar eclipses visible from the United States
- List of solar storms
- List of solar telescopes
- List of songs about close encounters with aliens
- List of songs recorded by Angels & Airwaves
- List of songs recorded by Kasabian
- List of songs recorded by Muse
- List of songs recorded by Pink Floyd
- List of sounding rockets
- List of southernmost items
- List of space art related books
- List of space artifacts in the Smithsonian Institution
- List of space artists
- List of space debris producing events
- List of space facilities
- List of space flight simulation games
- List of space forces, units, and formations
- List of space opera media
- List of space pirates
- List of space programs of the United States
- List of space races
- List of space stations
- List of space stations by country
- List of space telescopes
- List of space travelers by company
- List of space travelers by name
- List of spacecraft called Sputnik
- List of spacecraft deployed from the International Space Station
- List of spacecraft manufacturers
- List of spacecraft powered by non-rechargeable batteries
- List of spacecraft prefixes
- List of spacecraft with electric propulsion
- List of spaceflight non-fatal training accidents
- List of spaceflight records
- List of spaceflight-related accidents and incidents
- List of spaceflights to the International Space Station
- List of spaceplanes
- List of spacewalkers
- List of spacewalks 2000–2014
- List of spacewalks and moonwalks 1965–1999
- List of spacewalks since 2015
- List of spectroscopists
- List of spiral DRAGNs
- List of spiral galaxies
- List of squid-faced humanoids
- List of star extremes
- List of star names in Crux
- List of star names in Grus
- List of star names in Lepus
- List of star names in Pisces
- List of star systems within 16–20 light-years
- List of star systems within 20–25 light-years
- List of star systems within 25–30 light-years
- List of star systems within 30–35 light-years
- List of star systems within 35–40 light-years
- List of star systems within 40–45 light-years
- List of star systems within 45–50 light-years
- List of star systems within 50–55 light-years
- List of star systems within 55–60 light-years
- List of star systems within 60–65 light-years
- List of star systems within 65–70 light-years
- List of star systems within 70–75 light-years
- List of star-forming regions in the Local Group
- List of stars for navigation
- List of stars in Andromeda
- List of stars in Antlia
- List of stars in Apus
- List of stars in Aquarius
- List of stars in Aquila
- List of stars in Ara
- List of stars in Argo Navis
- List of stars in Aries
- List of stars in Auriga
- List of stars in Boötes
- List of stars in Caelum
- List of stars in Camelopardalis
- List of stars in Cancer
- List of stars in Canes Venatici
- List of stars in Canis Major
- List of stars in Canis Minor
- List of stars in Capricornus
- List of stars in Carina
- List of stars in Cassiopeia
- List of stars in Centaurus
- List of stars in Cepheus
- List of stars in Cetus
- List of stars in Chamaeleon
- List of stars in Circinus
- List of stars in Columba
- List of stars in Coma Berenices
- List of stars in Corona Australis
- List of stars in Corona Borealis
- List of stars in Corvus
- List of stars in Crater
- List of stars in Crux
- List of stars in Cygnus
- List of stars in Delphinus
- List of stars in Dorado
- List of stars in Draco
- List of stars in Equuleus
- List of stars in Eridanus
- List of stars in Fornax
- List of stars in Gemini
- List of stars in Grus
- List of stars in Hercules
- List of stars in Horologium
- List of stars in Hydra
- List of stars in Hydrus
- List of stars in Indus
- List of stars in Lacerta
- List of stars in Leo
- List of stars in Leo Minor
- List of stars in Lepus
- List of stars in Libra
- List of stars in Lupus
- List of stars in Lynx
- List of stars in Lyra
- List of stars in Mensa
- List of stars in Microscopium
- List of stars in Monoceros
- List of stars in Musca
- List of stars in Norma
- List of stars in Octans
- List of stars in Ophiuchus
- List of stars in Orion
- List of stars in Pavo
- List of stars in Pegasus
- List of stars in Perseus
- List of stars in Phoenix
- List of stars in Pictor
- List of stars in Pisces
- List of stars in Piscis Austrinus
- List of stars in Puppis
- List of stars in Pyxis
- List of stars in Reticulum
- List of stars in Sagitta
- List of stars in Sagittarius
- List of stars in Scorpius
- List of stars in Sculptor
- List of stars in Scutum
- List of stars in Serpens
- List of stars in Sextans
- List of stars in Taurus
- List of stars in Telescopium
- List of stars in Triangulum
- List of stars in Triangulum Australe
- List of stars in Tucana
- List of stars in Ursa Major
- List of stars in Ursa Minor
- List of stars in Vela
- List of stars in Virgo
- List of stars in Volans
- List of stars in Vulpecula
- List of stars more luminous than any closer star
- List of stars that dim oddly
- List of stars with proplyds
- List of stars with resolved images
- List of state soil science associations
- List of state soil science licensing boards
- List of stellar explosion types
- List of stellar properties
- List of stellar streams
- List of stoffs
- List of string theory topics
- List of sulfur lamp installations
- List of sundial mottos
- List of supernova candidates
- List of supernova remnants
- List of supernovae
- List of surface features of Mars visited by Spirit and Opportunity
- List of symbolic stars
- List of tallest mountains in the Solar System
- List of tectonic plates
- List of telescope parts and construction
- List of telescope types
- List of telescopes of Australia
- List of terrae on Venus
- List of the brightest Kuiper belt objects
- List of the largest optical telescopes in North America
- List of the most distant astronomical objects
- List of the physiographic regions of the world
- List of the star names in Draco
- List of theatres and entertainment venues in Paris
- List of theatres in Louisville, Kentucky
- List of things named after Christiaan Huygens
- List of things named after Friedrich Bessel
- List of things named after George Airy
- List of things named after Isaac Newton
- List of things named after Johannes Kepler
- List of things named after Joseph-Louis Lagrange
- List of things named after Pierre-Simon Laplace
- List of things named after Subrahmanyan Chandrasekhar
- List of topics in space
- List of trans-Neptunian objects
- List of transiting exoplanets
- List of transponder codes
- List of trees and shrubs by taxonomic family
- List of tumblers (small Solar System bodies)
- List of types of amber
- List of types of interferometers
- List of types of limestone
- List of types of marble
- List of ufologists
- List of uncrewed NASA missions
- List of uncrewed spacecraft by program
- List of uncrewed spaceflights to Mir
- List of uncrewed spaceflights to Salyut space stations
- List of unmanned aerial vehicle applications
- List of unnumbered minor planets
- List of unnumbered minor planets
- List of unnumbered minor planets
- List of unnumbered minor planets: 1994
- List of unnumbered minor planets: 1995
- List of unnumbered minor planets: 1996
- List of unnumbered minor planets: 1997
- List of unnumbered minor planets: 1998
- List of unnumbered minor planets: 1999 A–R
- List of unnumbered minor planets: 1999 S–T
- List of unnumbered minor planets: 1999 U–Y
- List of unnumbered minor planets: 2000 A–E
- List of unnumbered minor planets: 2000 F–O
- List of unnumbered minor planets: 2000 P–R
- List of unnumbered minor planets: 2000 S–T
- List of unnumbered minor planets: 2000 U–Y
- List of unnumbered minor planets: 2001 A–E
- List of unnumbered minor planets: 2001 F (0–216)
- List of unnumbered minor planets: 2001 F (217–619)
- List of unnumbered minor planets: 2001 G–O
- List of unnumbered minor planets: 2001 P–R
- List of unnumbered minor planets: 2001 S
- List of unnumbered minor planets: 2001 T
- List of unnumbered minor planets: 2001 U
- List of unnumbered minor planets: 2001 V–W
- List of unnumbered minor planets: 2001 X–Y
- List of unnumbered minor planets: 2002 A–B
- List of unnumbered minor planets: 2002 C
- List of unnumbered minor planets: 2002 D–F
- List of unnumbered minor planets: 2002 G–K
- List of unnumbered minor planets: 2002 L–O
- List of unnumbered minor planets: 2002 P
- List of unnumbered minor planets: 2002 Q (0–119)
- List of unnumbered minor planets: 2002 Q (120–619)
- List of unnumbered minor planets: 2002 R (0–262)
- List of unnumbered minor planets: 2002 R (263–619)
- List of unnumbered minor planets: 2002 S
- List of unnumbered minor planets: 2002 T (0–319)
- List of unnumbered minor planets: 2002 T (320–619)
- List of unnumbered minor planets: 2002 U–V
- List of unnumbered minor planets: 2002 W–Y
- List of unnumbered minor planets: 2003 A–E
- List of unnumbered minor planets: 2003 F–G
- List of unnumbered minor planets: 2003 H–L
- List of unnumbered minor planets: 2003 M–R
- List of unnumbered minor planets: 2003 S (0–269)
- List of unnumbered minor planets: 2003 S (270–389)
- List of unnumbered minor planets: 2003 S (390–442)
- List of unnumbered minor planets: 2003 S (443–619)
- List of unnumbered minor planets: 2003 T
- List of unnumbered minor planets: 2003 U (0–289)
- List of unnumbered minor planets: 2003 U (290–379)
- List of unnumbered minor planets: 2003 U (380–429)
- List of unnumbered minor planets: 2003 U (430–619)
- List of unnumbered minor planets: 2003 V
- List of unnumbered minor planets: 2003 W (0–199)
- List of unnumbered minor planets: 2003 W (200–619)
- List of unnumbered minor planets: 2003 X–Y
- List of unnumbered minor planets: 2004 A–B
- List of unnumbered minor planets: 2004 C
- List of unnumbered minor planets: 2004 D–E
- List of unnumbered minor planets: 2004 F
- List of unnumbered minor planets: 2004 G–H
- List of unnumbered minor planets: 2004 J–O
- List of unnumbered minor planets: 2004 P–Q
- List of unnumbered minor planets: 2004 R (0–199)
- List of unnumbered minor planets: 2004 R (200–299)
- List of unnumbered minor planets: 2004 R (300–619)
- List of unnumbered minor planets: 2004 S
- List of unnumbered minor planets: 2004 T (0–99)
- List of unnumbered minor planets: 2004 T (100–199)
- List of unnumbered minor planets: 2004 T (200–299)
- List of unnumbered minor planets: 2004 T (300–619)
- List of unnumbered minor planets: 2004 U–V
- List of unnumbered minor planets: 2004 W–X
- List of unnumbered minor planets: 2004 Y
- List of unnumbered trans-Neptunian objects
- List of unnumbered trans-Neptunian objects: 1999
- List of unnumbered trans-Neptunian objects: 2000
- List of unnumbered trans-Neptunian objects: 2001
- List of unnumbered trans-Neptunian objects: 2002
- List of unnumbered trans-Neptunian objects: 2003
- List of unnumbered trans-Neptunian objects: 2004
- List of unnumbered trans-Neptunian objects: 2005
- List of unnumbered trans-Neptunian objects: 2006
- List of unnumbered trans-Neptunian objects: 2007
- List of unnumbered trans-Neptunian objects: 2009
- List of unnumbered trans-Neptunian objects: 2010
- List of unnumbered trans-Neptunian objects: 2011
- List of unnumbered trans-Neptunian objects: 2012
- List of unnumbered trans-Neptunian objects: 2013
- List of unnumbered trans-Neptunian objects: 2014
- List of unnumbered trans-Neptunian objects: 2015
- List of unnumbered trans-Neptunian objects: 2016
- List of unreleased songs recorded by Pink Floyd
- List of unsolved problems in astronomy
- List of unsolved problems in geoscience
- List of unusual drainage systems
- List of valles on Mars
- List of valleys on the Moon
- List of variable stars
- List of vineyard soil types
- List of visitors to the International Space Station
- List of voids
- List of wastewater treatment technologies
- List of waves named after people
- List of white dwarfs
- List of women astronomers
- List of women in leadership positions on astronomical instrumentation projects
- List of youth solo sailing circumnavigations
- Lists of Conan O'Brien sketches
- Lists of Star Trek episodes
- Lists of Stargate episodes
- Lists of Stargate topics
- Lists of artificial objects sent into space
- Lists of astronauts
- Lists of astronomical objects
- Lists of black holes
- Lists of bodies of water
- Lists of comets
- Lists of constellations
- Lists of exoplanets
- Lists of fictional astronauts
- Lists of galaxies
- Lists of geological features of the Solar System
- Lists of lunar eclipses
- Lists of nebulae
- Lists of planets
- Lists of real astronomical locations in fiction
- Lists of rocket launches
- Lists of rockets
- Lists of small Solar System bodies
- Lists of solar eclipses
- Lists of space exploration milestones, 1957–1969
- Lists of space organizations
- Lists of space programs
- Lists of space scientists
- Lists of spacecraft
- Lists of spacewalks and moonwalks
- Lists of star names
- Lists of stars
- Lists of stars by constellation
- Lists of telescopes
- Liszt (crater)
- Lit a la turque
- LitSat-1
- LiteBIRD
- Litening
- Lithalsa
- Lithification
- Lithium Tokamak Experiment
- Lithium burning
- Lithium depletion boundary
- Lithium economy
- Lithium hydride
- Lithium toxicity
- Lithobraking
- Lithophile
- Lithophysa
- Lithoprobe
- Lithos (journal)
- Lithosphere
- Lithosphere–asthenosphere boundary
- Lithospheric drip
- Lithospheric flexure
- Lithospheric mantle
- Lithotope
- Lithotroph
- Lithuanian Plants Genes Bank
- Lithuanian Space Association
- Lithuanian Space Science and Technology Institute
- Litke (crater)
- Litke Deep
- Litmus
- Little Big Adventure
- Little Boots
- Little Dumbbell Nebula
- Little Ego
- Little Ghost Nebula
- Little Girl... Big Tease
- Little Green Men (Star Trek: Deep Space Nine)
- Little Joe (rocket)
- Little Joe 1
- Little Joe 1A
- Little Joe 1B
- Little Joe 2
- Little Joe 5
- Little Joe 5A
- Little Joe 5B
- Little Joe 6
- Little Joe II
- Little Joe II Qualification Test Vehicle
- Little Louie Vega
- Little Nemo
- Little Nemo: Adventures in Slumberland
- Little Nemo: The Dream Master
- Little Orpheus
- Little Peter's Journey to the Moon
- Little Switzerland (landscape)
- Little West (lunar crater)
- Little green men
- Little hierarchy problem
- Little string theory
- LittleBigPlanet
- LittleBigPlanet (2008 video game)
- LittleBigPlanet (2009 video game)
- LittleBigPlanet 2
- LittleBigPlanet 3
- LittleBigPlanet Karting
- LittleBigPlanet PS Vita
- Litton Industries
- Littoral zone
- Littrow (crater)
- LituanicaSAT-1
- LituanicaSAT-2
- Liu Boming (astronaut)
- Liu Hsin (crater)
- Liu Wang
- Liu Yang (astronaut)
- Liulin type instruments
- Liuyang fireworks
- Live and Let Die (film)
- Live on Letterman
- Livermore Optical Transient Imaging System
- Liverpool Astronomical Society
- Liverpool Telescope
- Liverpool crater
- Living Earth Simulator Project
- Living Interplanetary Flight Experiment
- Living Planet Programme
- Living Plume Shield (satellite)
- Living Reviews in Relativity
- Living Reviews in Solar Physics
- Living Staff Living Wage
- Living machine
- Livingston, Louisiana
- Lixisol
- Liz Danforth
- Liz Dawn
- Liz Gorinsky
- Liz Henry
- Liz MacDonald
- Liz Parker
- Liza Minnelli
- Liège Space Center
- Ljubinka Nikolić
- Ljubov Rebane
- Ljusdal Batholith
- LkCa 15
- LkCa 15 b
- Llanesco
- Llano de Chajnantor Observatory
- Llano del Hato National Astronomical Observatory
- Lleu Llaw Gyffes
- Lloviu virus
- Lloyd Arthur Eshbach
- Lloyd Motz
- Lloyd in Space
- Lloyd's mirror
- LoTr 5
- Loam
- Lobachevskiy (crater)
- Lobate debris apron
- Lobster Man from Mars
- Local Bubble
- Local Data Manager
- Local Environment: The International Journal of Justice and Sustainability
- Local Group
- Local Leo Cold Cloud
- Local Notice to Mariners
- Local Sheet
- Local Void
- Local coordinates
- Local lymph node assay
- Local mean time
- Local optical committee
- Local reference frame
- Local sleep
- Local standard of rest
- Local-area augmentation system
- Locality (astronomy)
- Location
- Location model
- Location of Earth
- Location-based game
- Location-based service
- LocationSmart
- Locational astrology
- Locationized gun
- Loch Leven (Kinross)
- Lochium Funis
- Lockheed L-301
- Lockheed Martin A2100
- Lockheed Martin Compact Fusion Reactor
- Lockheed Martin Lunar Lander
- Lockheed Martin Solar and Astrophysics Laboratory
- Lockheed Martin Space
- Lockheed Martin X-33
- Lockheed NF-104A
- Lockheed SR-71 Blackbird
- Lockheed Star Clipper
- Lockheed WC-130
- Lockheed WP-3D Orion
- Lockman Hole
- Lockyer (Martian crater)
- Lockyer (lunar crater)
- LocoRoco Midnight Carnival
- Locomotion in space
- Locus Map
- Lod (crater)
- Lode
- Lodewijk Woltjer
- Lodewijk van den Berg
- Lodovico delle Colombe
- Lodygin (crater)
- Loess
- Loew's Jersey Theatre
- Loew's Theatre, New Rochelle
- Loew's Valencia Theatre
- Loew's Wonder Theatres
- Loewy (crater)
- Lofn (crater)
- Log jam
- Log wind profile
- Logan Medal
- Logancha crater
- Loge (moon)
- Logic of Empire
- Logoisk crater
- Lohrmann (crater)
- Lohse (Martian crater)
- Lohse (lunar crater)
- Lois Jones (scientist)
- Lois McMaster Bujold
- Lois Rodden
- Loiter Squad
- Loki (rocket)
- Loki Patera
- Loki's Minions Capture the Flag
- Lol Hammond
- Loltun Cave
- Lomonosov (Martian crater)
- Lomonosov (lunar crater)
- Lona (mythology)
- Lonar Lake
- London Apprentice, Isleworth
- London Planetarium
- London dial
- Lone Echo
- Lone Echo II
- Lone Signal
- Lone Star (Amtrak train)
- Lone Star (St. Louis Southwestern train)
- Long Ambients 1: Calm. Sleep.
- Long Ambients 2
- Long Duration Exposure Facility
- Long March (rocket family)
- Long March 1
- Long March 1D
- Long March 2A
- Long March 2E
- Long March 2F
- Long March 3A
- Long March 3C
- Long March 4A
- Long March 4C
- Long March 6
- Long March 8
- Long March Launch Vehicle Technology
- Long Michelson Interferometer
- Long Night of Museums
- Long Pigs
- Long Range Reconnaissance Imager
- Long Tom (rocket)
- Long Wavelength Array
- Long baseline acoustic positioning system
- Long path laser
- Long-period fiber grating
- Long-period tides
- Long-period variable star
- Long-slit spectroscopy
- Long-whiskered owlet
- Longanus
- Longitude
- Longitude of the ascending node
- Longitude of the periapsis
- Longomontanus (crater)
- Longshore drift
- Lonnie Thompson
- Lonsdaleite
- Look to Windward
- Looking Backward
- Looking-glass world
- Looney Tunes: Rabbits Run
- Loop I Bubble
- Loop quantum gravity
- Loop representation in gauge theories and quantum gravity
- Loophole (short story)
- Lopian orogeny
- Lopolith
- Loral O'Hara
- Loran-C
- Lord High Admiral, Pimlico
- Lord Howe boobook
- Lord Nelson, Bermondsey
- Lord Tredegar, Bow
- Lords and Ladies (novel)
- Lords of the Day
- Lords of the Night
- Lords of the Storm
- Loren Acton
- Loren C. Ball
- Loren Shriver
- Lorena Xtravaganza
- Lorentz (crater)
- Lorentz Eichstadt
- Lorentz factor
- Lorentz force velocimetry
- Lorentz invariance in non-critical string theory
- Lorenz beam
- Loreto (meteorite)
- Loretta Gregorini
- Lori Garver
- Lori Glaze
- Lorin Morgan-Richards
- Lorna Luft
- Lorne Lanning
- Los Angeles (meteorite)
- Los Angeles Assembly
- Los Angeles Limited
- Los Angeles Resistance Cell
- Los Angeles Theatre
- Los Molinos Observatory
- Los Olivos stampede
- Los astronautas
- Loser (Ayreon song)
- Losing stream
- Losna (mythology)
- Lost (Maguire novel)
- Lost Cosmonauts
- Lost Moon
- Lost Planet
- Lost Planet 2
- Lost Planet 3
- Lost Planet: Extreme Condition
- Lost Years of Merlin series
- Lost comet
- Lost for Words (Pink Floyd song)
- Lost in Space
- Lost in Space (2018 TV series)
- Lost in Space (film)
- Lost minor planet
- Lou Anders
- Lou Aronica
- Lou Stathis
- Lou Steele
- Louanne Katraine
- Loucetios
- Louder than Words (Pink Floyd song)
- Louie DeVito
- Louis Agricola Bauer
- Louis Allamandola
- Louis Antoine de Bougainville
- Louis Beaufort Stewart
- Louis Bernacchi
- Louis Boyer (astronomer)
- Louis Friedman
- Louis G. Henyey
- Louis Hayes Petit
- Louis Leplée
- Louis Maillard (astronomer)
- Louis Niesten
- Louis Néel Medal
- Louis Rendu
- Louis Rosenblum
- Louis Zimmer
- Louise Brooks
- Louise Edwards
- Louise Huffman
- Louise Prockter
- Louise Riofrio
- Louise Wallis
- Louise du Pierry
- Louisiana Eagle
- Louisiana meridian
- Louisville Astronomical Society
- Louisville Ridge
- Lourdes water
- Louros Valles
- Louville
- Love & Destroy
- Love (2011 film)
- Love (crater)
- Love Camp 7
- Love Cove Group
- Love Is Noise
- Love Toy
- Love Walks In
- Love and Rocket
- Love number
- Lovelace (crater)
- Loveland frog
- Loveline
- Lovell (crater)
- Lovell Lawrence Jr.
- Lovell Telescope
- Lovelock theory of gravity
- Lovelock's theorem
- Lovely But Deadly
- Low Earth orbit
- Low marsh
- Low surface brightness galaxy
- Low thrust relative orbital transfer
- Low-Density Supersonic Decelerator
- Low-Frequency Array (LOFAR)
- Low-energy electron diffraction
- Low-energy plasma-enhanced chemical vapor deposition
- Low-energy transfer
- Low-g condition
- Low-ionization nuclear emission-line region
- Low-pressure discharge
- Low-rate picture transmission
- Low-temperature thermal desorption
- Low-tide elevation
- Low-velocity zone
- Lowe sequence
- Lowell (Martian crater)
- Lowell (lunar crater)
- Lowell Observatory
- Lowell Observatory Near-Earth-Object Search
- Lowell Regio
- Lowell Wood
- Lower hybrid oscillation
- Lower mantle (Earth)
- Lower oceanic crust
- Lowest published toxic dose
- Lowest temperature recorded on Earth
- Lowest-observed-adverse-effect level
- Lowndean Professor of Astronomy and Geometry
- Lowrance Electronics
- Loyal Blaine Aldrich
- Loyalty bent-winged bat
- Loyola Residence Tower
- Lrrreconcilable Ndndifferences
- Lu Hsun (crater)
- Luapula River
- Lubbock (crater)
- Lubiniezky (crater)
- Luboš Kohoutek
- Luboš Perek
- Luc Besson
- Luc Bürgin
- Luca Gaurico
- Lucas Lombriser
- Lucas Watzenrode
- Lucasfilm Ltd v Ainsworth
- Luceafărul (poem)
- Luch (satellite)
- Luch 5A
- Luch 5B
- Luch 5V
- Lucia (film)
- Lucia Pamela
- Luciad
- Lucian (crater)
- Lucianne Walkowicz
- Luciano Rezzolla
- Luciano Tesi
- Lucid dream
- Lucidity (video game)
- Lucie Green
- Lucien LaCoste
- Lucien Rudaux
- Lucifer
- Lucifer Sam
- Lucifer's Hammer
- Lucifer's Women
- Lucina (mythology)
- Lucius Caesonius Ovinius Manlius Rufinianus Bassus
- Lucius Tarutius Firmanus
- Lucky Lou's
- Lucky Man (The Verve song)
- Lucky Starr and the Big Sun of Mercury
- Lucky Starr and the Moons of Jupiter
- Lucky Starr and the Oceans of Venus
- Lucky Starr and the Pirates of the Asteroids
- Lucky Starr and the Rings of Saturn
- Lucky Starr series
- Lucky imaging
- Lucretius (crater)
- Lucy (spacecraft)
- Lucy Hawking
- Lucy Rogers
- Lucy, the Daughter of the Devil
- Lucy-Ann McFadden
- Lucy–Hook coaddition method
- Ludovic Hubler
- Ludwig (crater)
- Ludwig Bertele
- Ludwig Biermann
- Ludwig Biermann Award
- Ludwig Roth
- Ludwig Schupmann
- Ludwig von Hagemeister
- Ludwik Birkenmajer
- Ludwik Silberstein
- Luděk Pešek
- Luftwaffe radio equipment of World War II
- Lugal-irra and Meslamta-ea
- Lugeon
- Lugh
- Lugus
- Luhman 16
- Luigi Carnera
- Luigi Ferdinando Marsili
- Luigi Gussalli
- Luigi Sannino
- Luis Camacho (dancer)
- Luis Enrique Erro
- Luis García Sainz
- Luis Royo
- Luisa María Lara
- Luiz DePalma
- Luizi crater
- Lujendra Ojha
- Luke Drury (astrophysicist)
- Luke Skywalker
- Lukunsky grove
- Lulin Observatory
- Lullaby Land (film)
- Luminary (astrology)
- Luminescent solar concentrator
- Luminosity
- Luminosity distance
- Luminosity function (astronomy)
- Luminous blue variable
- Luminous discharge tubes
- Luminous infrared galaxy
- Luminous red nova
- Lummer–Gehrcke interferometer
- Lumparn
- Luna (1965 film)
- Luna (TV series)
- Luna (goddess)
- Luna (rocket)
- Luna 1
- Luna 10
- Luna 11
- Luna 12
- Luna 13
- Luna 14
- Luna 15
- Luna 16
- Luna 17
- Luna 18
- Luna 19
- Luna 2
- Luna 20
- Luna 21
- Luna 22
- Luna 23
- Luna 24
- Luna 25
- Luna 26
- Luna 27
- Luna 28
- Luna 3
- Luna 4
- Luna 5
- Luna 6
- Luna 7
- Luna 8
- Luna 9
- Luna E-1 No.1
- Luna E-1 No.2
- Luna E-1 No.3
- Luna E-1A No.1
- Luna E-3 No.1
- Luna E-3 No.2
- Luna E-6 No.2
- Luna E-6 No.3
- Luna E-6 No.5
- Luna E-6 No.6
- Luna E-6 No.8
- Luna E-6LS No.112
- Luna E-8 No.201
- Luna E-8-5 No. 402
- Luna E-8-5 No. 405
- Luna E-8-5M No. 412
- Luna Leopold
- Luna Ring
- Luna programme
- Luna-Glob
- Luna: Moon Rising
- Luna: New Moon
- Luna: Wolf Moon
- LunaCorp
- Lunae Palus quadrangle
- Lunar 100
- Lunar CATALYST
- Lunar Crater Radio Telescope
- Lunar Expeditionary Complex
- Lunar Explorers Society
- Lunar Flag Assembly
- Lunar Flashlight
- Lunar Gateway
- Lunar IceCube
- Lunar Infrastructure for Exploration
- Lunar Jetman
- Lunar Lander (1979 video game)
- Lunar Lander (1980 video game)
- Lunar Lander (spacecraft)
- Lunar Lander (video game genre)
- Lunar Lander Challenge
- Lunar Landing Research Facility
- Lunar Landing Research Vehicle
- Lunar Laser Ranging experiment
- Lunar Legend
- Lunar Mission One
- Lunar Module Eagle
- Lunar New Year fireworks display in Hong Kong
- Lunar Orbital Station
- Lunar Orbiter 1
- Lunar Orbiter 2
- Lunar Orbiter 3
- Lunar Orbiter 4
- Lunar Orbiter 5
- Lunar Orbiter program
- Lunar Polar Exploration Mission
- Lunar Polar Hydrogen Mapper
- Lunar Precursor Robotic Program
- Lunar Prospector
- Lunar Receiving Laboratory
- Lunar Reconnaissance Orbiter
- Lunar Roving Vehicle
- Lunar Sample Laboratory Facility
- Lunar Ultraviolet Cosmic Imager
- Lunar X
- Lunar and Planetary Laboratory
- Lunar and Planetary Science Conference
- Lunar basalt 70017
- Lunar craters
- Lunar cycler
- Lunar day
- Lunar distance (astronomy)
- Lunar distance (navigation)
- Lunar dome
- Lunar eclipse
- Lunar effect
- Lunar escape systems
- Lunar geologic timescale
- Lunar lander
- Lunar lava tube
- Lunar limb
- Lunar magma ocean
- Lunar mare
- Lunar module
- Lunar month
- Lunar node
- Lunar north pole
- Lunar observation
- Lunar orbit
- Lunar orbit rendezvous
- Lunar outpost (NASA)
- Lunar pareidolia
- Lunar penetrometer
- Lunar phase
- Lunar plaque
- Lunar precession
- Lunar prediction program of SUPARCO
- Lunar regolith simulant
- Lunar resources
- Lunar rover
- Lunar sample displays
- Lunar seismology
- Lunar soil
- Lunar sortie
- Lunar south pole
- Lunar space elevator
- Lunar standstill
- Lunar station
- Lunar swirls
- Lunar terrane
- Lunar theory
- Lunar water
- Lunar-A
- Lunar: Eternal Blue
- Lunar: Silver Star Harmony
- Lunar: Silver Star Story Complete
- Lunar: The Silver Star
- Lunarcrete
- Lunarcy!
- Lunarville 7
- Lunary
- Lunatarium
- Lund Observatory
- Lund astronomical clock
- Lundmark (crater)
- Lundquist number
- Lunex Project
- Lunisolar calendar
- Lunitidal interval
- Lunokhod 1
- Lunokhod 2
- Lunokhod programme
- Lunopolis
- Luodong Night Market
- Lupe Fuentes
- Lupitus of Barcelona
- Lupus (constellation)
- Lupus in Chinese astronomy
- Lupus-TR-3
- Lupus-TR-3b
- Lurie–Houghton telescope
- Luther (crater)
- Lutz D. Schmadel
- Lutz–Kelker bias
- Luvisol
- Luwr
- Luxembourg
- Luxim
- Luxinnovation
- Luxspace
- Luyten 726-8
- Luyten b
- Luyten's Star
- Luzin (crater)
- Luzon scops owl
- Luís Cruls
- Lviv Centre of Institute for Space Research
- Lyappa arm
- Lyapunov (crater)
- Lybid 1
- Lycanthropy (album)
- Lyco of Iasos
- Lyctos Facula
- Lycus (river of Bithynia)
- Lycus (river of Cilicia)
- Lycus (river of Lydia)
- Lycus Sulci
- Lydia Jennings
- Lyell (Martian crater)
- Lyell (lunar crater)
- Lyell Medal
- Lyft
- Lyman (crater)
- Lyman Page
- Lyman Spitzer
- Lyman continuum photons
- Lyman limit
- Lyman series
- Lyman-alpha blob
- Lyman-alpha blob 1
- Lyman-alpha emitter
- Lyman-alpha forest
- Lyman-alpha line
- Lyman-break galaxy
- Lyman–Werner photons
- Lynchet
- Lyndon B. Johnson
- Lynds 1616
- Lynds' Catalogue of Bright Nebulae
- Lyndsay Fletcher
- Lynn Abbey
- Lynn Cominsky
- Lynn Flewelling
- Lynn J. Rothschild
- Lynnae Quick
- Lynne Karen Deutsch
- Lynne M. Thomas
- Lynne Talley
- Lynx (constellation)
- Lynx Arc
- Lynx Supercluster
- Lynx X-ray Observatory
- Lynx in Chinese astronomy
- Lynx–Ursa Major Filament
- Lynx–Ursa Major Supercluster
- Lyon Observatory
- Lyon astronomical clock
- Lyon-Meudon Extragalactic Database
- Lyons Groups of Galaxies
- Lyot (Martian crater)
- Lyot (lunar crater)
- Lyra
- Lyra in Chinese astronomy
- Lyrids
- Lysippus (crater)
- Lysis of Taras
- Lysithea (moon)
- Lysocline
- Lyssavirus
- Lyth bound
- Lyudmila Chernykh
- Lyudmila Karachkina
- Lyudmila Zhuravleva
- László Detre (astronomer)
- Ländchen (Havelland)
- Læså Formation
- Léo-Ernest Ouimet
- Léon Levavasseur
- Léon Teisserenc de Bort
- Léopold Eyharts
- Léopold de Saussure
- Lăptăria Enache
- Līva
- M 1-42
- M Carinae
- M Centauri
- M Puppis
- M Velorum
- M band (infrared)
- M-100 (explosive)
- M-100 (rocket)
- M-10001
- M-80 (explosive)
- M-Corp (Red Dwarf)
- M-Cubed
- M-theory
- M-type asteroid
- M. Christian
- M. John Harrison
- M. Night Shyamalan
- M. Pitchaimani
- M. Shahid Qureshi
- M.A.C.H. (video game)
- M1-92
- M101 Group
- M101 OT2015-1
- M109 Group
- M2-9
- M2-brane
- M31-RV
- M32p
- M33 X-7
- M33 in Andromeda
- M33-013406.63
- M5-brane
- M51 Group
- M55E1
- M59-UCD3
- M60-UCD1
- M6D Pistol
- M74 Group
- M81 Group
- M82 X-1
- M82 X-2
- M85-HCC1
- M94 Group
- M96 Group
- MABES
- MAC Awards
- MACHO 176.18833.411
- MACHO Project
- MACHO-1997-BLG-41
- MACHO-98-BLG-35
- MACS 1423-z7p64
- MACS J0025.4-1222
- MACS J0416.1-2403
- MACS J0647.7+7015
- MACS J0717.5+3745
- MACS J1149 Lensed Star 1
- MACS0647-JD
- MACS1149-JD1
- MAGIC (telescope)
- MAJORANA
- MAKS (spacecraft)
- MANTIS (spacecraft)
- MARIACHI
- MARPOL 73/78
- MARS-500
- MARSIS
- MASCARA
- MASTER
- MASWCD
- MAVEN
- MAVLink
- MAX-1 (spacecraft)
- MAXI (ISS experiment)
- MAXI J1659-152
- MAssive Cluster Survey
- MB 3
- MBAS assay
- MBDA
- MBDA UK
- MC Hawking
- MCELS (Magellanic Cloud Emission-line Survey)
- MCG+01-02-015
- MCG+07-33-027
- MDA (company)
- MDM Observatory
- MDS-1
- MEASAT Satellite Systems
- MEASAT-3
- MEASAT-3a
- MEASAT-3b
- MELOS
- MELiSSA
- MEMO model (wind-flow simulation)
- MEMX
- MERCURE
- MERIS
- MERLIN
- MERLIN (refrigerator)
- MERS coronavirus EMC/2012
- MESSENGER
- METAFOR
- METI (Messaging Extraterrestrial Intelligence)
- METRIC
- MEarth Project
- MGC1
- MGM-134 Midgetman
- MHW-RTG
- MIAMI Facilities
- MICROSCOPE
- MIKE 11
- MIKE 21
- MIKE 21C
- MIKE BASIN
- MIKE FLOOD
- MIKE SHE
- MIL-STD-1553
- MIL-STD-1750A
- MIMOS II
- MIMOSA
- MINERVA (spacecraft)
- MINERVA-Australis
- MINERνA
- MINOS
- MINOS+
- MIRI (Mid-Infrared Instrument)
- MIST (Satellite)
- MISTRAM
- MIT General Circulation Model
- MIT Plasma Science and Fusion Center
- MK-1TS
- MKF-6 (multispectral camera)
- MM5 (weather model)
- MMA Club
- MMR06
- MN zonation
- MOA-2007-BLG-192L
- MOA-2007-BLG-192Lb
- MOA-2007-BLG-197Lb
- MOA-2007-BLG-400L
- MOA-2007-BLG-400Lb
- MOA-2008-BLG-310L
- MOA-2008-BLG-310Lb
- MOA-2009-BLG-387L
- MOA-2009-BLG-387Lb
- MOA-2010-BLG-477L
- MOC Public Targeting Program
- MOOSE
- MOPITT
- MOS-1 (satellite)
- MOSDAC
- MOSE
- MOST (spacecraft)
- MOZART (model)
- MPG/ESO telescope
- MPTA-098
- MPTA-ET
- MR-12
- MR-20
- MR-UR-100 Sotka
- MRC 1138-262
- MS (satellite)
- MS 0302+17
- MS 0735.6+7421
- MS 1512-cB58
- MS-II
- MSAT
- MSSTA
- MT Pegasi
- MTSAT Satellite Augmentation System
- MTZ black hole
- MUBLCOM
- MUL.APIN
- MULTICOM
- MUSE (spacecraft)
- MUSIS
- MUTO
- MV Freedom Star
- MV Havengore
- MV Liberty Star
- MV Retriever
- MW 18014
- MWC 349
- MWC 480
- MX Puppis
- MY Apodis
- MY Camelopardalis
- MY Cephei
- MZ Puppis
- Ma Chih-Yuan (crater)
- Ma Chung-pei
- Ma Prem Usha
- Ma Yize
- Ma'adim Vallis
- MaSat-1
- Maarten Schmidt
- Maas–Hoffman model
- Maat Mons
- Mab (moon)
- Mabel King
- Mac Tonight
- Mac and Me
- MacChoro
- MacDowell–Mansouri action
- MacMillan (crater)
- Macalester College Observatory
- Macaronesian Biogeographic Region
- Macarthur Astronomical Society
- Macarthur Astronomy Forum
- Macau Science Center
- Macellum of Pozzuoli
- Maceral
- Macfarlane Observatory
- Mach (crater)
- Mach's principle
- Macha
- Macha crater
- Machair
- Machaut (crater)
- Machina Electrica
- Machine Man
- Machine guidance
- Machineries of Empire
- Machu Picchu
- Mach–Zehnder interferometer
- Macie Roberts
- Maciej Konacki
- Maciej Parowski
- Macinnes's mouse-tailed bat
- Mackay Lacus
- Mackenzie River
- Mackin (crater)
- Mackinac Island meteorite
- Mackinawite
- Maclaurin (crater)
- Maclaurin spheroid
- Maclear (crater)
- Macquarie Infrastructure Corporation
- Macrobenthos
- Macrobius (crater)
- Macroecology
- Macroglossini (Chiroptera)
- Macroinvertebrate Community Index
- Macron (physics)
- Macronyssus
- Macropore
- Macroscope (novel)
- Macroscope (science concept)
- Macross
- Macula (planetary geology)
- Mad About Physics
- Mad Bodies
- Mad Cowgirl
- Mad Foxes
- Mad Max 2
- Mad Mines
- Mad Planets
- Mad Vallis
- Mad Youth
- Mad as a Mars Hare
- Madagascar
- Madame Arthur
- Made In Space, Inc.
- Madeiran scops owl
- Mademoiselle Yulia
- Madge Adam
- Madhava of Sangamagrama
- Madhulika Guhathakurta
- Madison Symmetric Torus
- Madman (film)
- Madness (Muse song)
- Madras Film Society
- Madras Observatory
- Madrid Codex (Maya)
- Madrid Deep Space Communications Complex
- Madrid Planetarium
- Madwave
- Mae Jemison
- Maeshowe
- Maestlin (crater)
- Maestro (software)
- Maffei 1
- Maffei 2
- Mafia (video game)
- Mafia: Definitive Edition
- MagBeam
- Magadi (crater)
- Magali Vaissière
- Magdalena González Sánchez
- Magdalena Ridge Observatory
- Magec
- Magelhaens (Martian crater)
- Magelhaens (crater)
- Magelhaens (lunar crater)
- Magellan (spacecraft)
- Magellan Aerospace
- Magellan Navigation
- Magellan Planet Search Program
- Magellan Telescopes
- Magellanic Bridge
- Magellanic Catalogue of Stars
- Magellanic Clouds
- Magellanic Stream
- Magellanic spiral
- Mageshima
- Maggie Thompson
- Maggini (crater)
- Magha (month)
- Maghreb owl
- Magi
- Magi Astrology
- Magi Society
- Magic Circus
- Magic Johnson
- Magic Journeys
- Magic angle
- Magic angle (EELS)
- Magic hexagram
- Magic pipe
- Magic star
- Magic, Music and Mayhem
- Magic: The Gathering
- Magical: Disney's New Nighttime Spectacular of Magical Celebrations
- Maginus (crater)
- Magma ocean
- Magmatic foliation
- Magmatism
- MagnaCarta 2
- Magnesium citrate
- Magnet fishing
- Magnetar
- Magnetic boots
- Magnetic circular dichroism
- Magnetic cloud
- Magnetic confinement fusion
- Magnetic diffusion
- Magnetic diffusivity
- Magnetic field of the Moon
- Magnetic field oscillating amplified thruster
- Magnetic helicity
- Magnetic midnight
- Magnetic mirror point
- Magnetic monopole
- Magnetic nano
- Magnetic pressure
- Magnetic proton recoil neutron spectrometer
- Magnetic reconnection
- Magnetic sail
- Magnetic trap (atoms)
- Magnetic tweezers
- Magnetization reversal by circularly polarized light
- Magnetized Liner Inertial Fusion
- Magnetized target fusion
- Magneto-inertial fusion
- Magneto-optical trap
- Magnetochromism
- Magnetogravity wave
- Magnetohydrodynamic converter
- Magnetohydrodynamic drive
- Magnetohydrodynamic generator
- Magnetohydrodynamics
- Magnetometer (Juno)
- Magnetopause
- Magnetoplasmadynamic thruster
- Magnetorotational instability
- Magnetorquer
- Magnetosheath
- Magnetosonic wave
- Magnetosphere
- Magnetosphere chronology
- Magnetosphere of Jupiter
- Magnetosphere of Saturn
- Magnetosphere particle motion
- Magnetospheric Multiscale Mission
- Magnetospheric eternally collapsing object
- Magnetotellurics
- Magnetron (video game)
- Magnificent Desolation (book)
- Magnificent Desolation: Walking on the Moon 3D
- Magnitude (astronomy)
- Magnitude of eclipse
- Magnum (rocket)
- Magnum (satellite)
- Magnus Celsius
- Magnus Georg Paucker
- Magnus von Braun
- Magnus von Braun (senior)
- Magnuson Park
- Magomed Tolboyev
- Magritte (crater)
- Magsat
- Mah
- Mahendra Sūri
- Mahina (mythology)
- Mahler (crater)
- Mahmooda Sultana
- Mahmud Ahmad Hamdi al-Falaki
- Mahuika crater
- Mahābhūta
- Mai Tai Sing
- Maia (star)
- Maia (video game)
- Maila Nurmi
- Maimonides
- Main (Martian crater)
- Main (lunar crater)
- Main Centre for Missile Attack Warning
- Main Centre for Reconnaissance of Situation in Space
- Main river
- Main sequence
- Mainstreet Theater
- Mainstreeter
- Maintenance of the International Space Station
- Mairan (crater)
- Maithuna
- Maius
- Maja Valles
- Majestic, Leeds
- Majid Husain
- Majik Boys
- Majin Buu
- Majipoor series
- Major Astro
- Major Atmospheric Cerenkov Experiment Telescope
- Major Coxson
- Major Disaster
- Major Matt Mason
- Major Tom
- Major Tom (Coming Home)
- Major soil deposits of India
- Major stationary source
- Major's long-fingered bat
- Majorite
- Makar Sankranti
- Makara (month)
- Makemake
- Makemake (deity)
- Makiko Ohmoto
- Making Contact (book)
- Making Money
- Making Our Dreams Come True
- Makio Akiyama
- Mako (Mass Effect)
- Mako Miyata
- Maksim Ponomaryov
- Maksim Surayev
- Maksutov (crater)
- Maksutov telescope
- Malabimba – The Malicious Whore
- Malachite green
- Malacidin
- Malagasy orogeny
- Malagasy slit-faced bat
- Malakbel
- Malakoff Tower
- Malament–Hogarth spacetime
- Malapert (crater)
- Malara
- Malargüe Station
- Malaspina Expedition 2010
- Malawi
- Malayalam calendar
- Malayan slit-faced bat
- Malaysia Airlines Flight 370 satellite communications
- Malaysian Centre of Remote Sensing
- Malaysian Remote Sensing Agency
- Malaysian Space Agency
- Malcolm Davis (ornithologist)
- Malcolm Edwards
- Malcolm Fridlund
- Malcolm Graham (priest)
- Malcolm Hartley
- Malcolm L. McCallum
- Malcolm Ludvigsen
- Malcolm MacEwen
- Malcolm MacLeod (British Army officer)
- Malcolm Reynolds
- Malcolm von Schantz
- Maldivian Youth Climate Network
- Malediva
- Malefic planet
- Malemute
- Malente (DJ)
- Malfador Machinations
- Mali
- Malibu High
- Malice (1997 video game)
- Malin 1
- Malin Space Science Systems
- Malina (mythology)
- Mallet (crater)
- Mallín
- Malmquist bias
- Malpelo Ridge
- Malthusian League
- Malus (constellation)
- Malvin Ruderman
- Malyy (crater)
- Mama Killa
- Mama's Dirty Girls
- Mamers Valles
- Mamoru Mohri
- Mamoru Oshii
- Man Enters the Cosmos
- Man Parrish
- Man Plus
- Man Will Conquer Space Soon!
- Man and the Moon
- Man and the Planets
- Man in Space Soonest
- Man in the Moon
- Man of Earth
- Man of Simple Pleasures
- Man of Steel (film)
- Man on the Moon (book)
- Man on the Moon (musical)
- Man on the Moon (song)
- Man-E-Faces
- Man-Kzin Wars
- Mana Bar
- Managed retreat
- Manaiakalani
- Manastash Ridge Observatory
- Manbij Plain
- Manchester Astronomical Society
- Manco Cápac
- Mandalorian
- Mandel'shtam (crater)
- Mandibular advancement splint
- Mandingo (film)
- Mandjet Chasma
- Mandla Maseko
- Mandora (crater)
- Mandulis
- Mandé creation myth
- Maned owl
- Manfred Cassirer
- Manfred Fuchs
- Manfred Memorial Moon Mission
- Mangala
- Mangala Dosha
- Mangala Fossa
- Mangala Valles
- Mangrove
- Manhattan Clique
- Manhattan Limited
- Manhattanhenge
- Manhole
- Manhole cover
- Maniac (1934 film)
- Maniac (1980 film)
- Manicouagan Reservoir
- Manifest covariance
- Manifold Trilogy
- Maniitsoq Norite Belt
- Maniitsoq structure
- Manila Observatory
- Manilius (crater)
- Manitoba Museum
- Manitoulin Island
- Manne Siegbahn
- Manned Maneuvering Unit
- Manned Orbiting Laboratory
- Manned Venus flyby
- Manners (crater)
- Mannheim Observatory
- Manning formula
- Manny Lehman (DJ)
- Manny Roth
- Manny the Hippie
- Mano (mythology)
- Manoug Manougian
- Mansagari
- Mansart (crater)
- Mansfield and Sutton Astronomical Society
- Mansion nightclub
- Mansion of the Living Dead
- Manson crater
- Mansukh Chaturvedi ki Atmakatha
- Mansur (crater)
- Manta Force
- Mantle (geology)
- Mantle oxidation state
- Mantle plume
- Mantreswara
- Manuel Arturo Izquierdo Peña
- Manuel Bryennios
- Manuel Cardona
- Manuel Dias the Younger
- Manuel John Johnson
- Manuel Peimbert
- Manuel Sandoval Vallarta
- Manuela Campanelli (scientist)
- Manufacturing USA
- Manufacturing of the International Space Station
- Manure management
- Manus masked owl
- Manvantara
- Manx comet
- Many-worlds interpretation
- Manzinus (crater)
- Map
- Map Collectors' Circle
- Map analysis
- Map coloring
- Map communication model
- Map extent
- Map matching
- Map of the Problematique
- Map projection
- Map surround
- Map symbol
- Mapheus 5
- Maple Creek crater
- Maple Leaf (LV train)
- Mapopolis
- Mapping Imaging Spectrometer for Europa
- Mapping of Venus
- Maps.me
- Maptek
- Map–territory relation
- Mara Jade
- Maragheh observatory
- Maraka (Hindu astrology)
- Maraldi (Martian crater)
- Maraldi (lunar crater)
- Marama (mythology)
- Marat Arakelian
- Marathon (video game)
- Marathon Trilogy
- Maravillas de Colombia S.A.
- Marañón fold and thrust belt
- Maraş massacre
- Marble (software)
- Marbles Kids Museum
- Marburgvirus
- Marc Aaronson
- Marc Benjamin
- Marc Buie
- Marc Davis (astronomer)
- Marc Garneau
- Marc Kamionkowski
- Marc Kuchner
- Marc Marzenit
- Marc Mysterio
- Marc Postman
- Marc Reagan
- Marcab Confederacy
- Marcahuasi
- Marcel Dettmann
- Marcel Golay (astronomer)
- Marcel Grossmann
- Marcel Minnaert
- Marcello Squarcialupi
- Marcelo Gleiser
- March (crater)
- March 17, 2016 collision with Jupiter
- March 1989 geomagnetic storm
- March equinox
- Marci (crater)
- Marcia J. Rieke
- Marcia Neugebauer
- Marcia Pelham, Countess of Yarborough
- Marcianos vs. Mexicanos
- Marcin Bylica
- Marcin Król z Żurawicy
- Marcin Kubiak
- Marcin Odlanicki Poczobutt
- Marco Cavagna
- Marco Drago
- Marco Hietala
- Marco Polo (crater)
- Marco Polo (spacecraft)
- Marco Tedesco
- Marco V
- Marconi (crater)
- Marcos Pontes
- Marcus Prinz von Anhalt
- Marcus Stokes
- Mardi Gras Massacre
- Marduk
- Mare (folklore)
- Mare Acidalium quadrangle
- Mare Anguis
- Mare Australe
- Mare Australe quadrangle
- Mare Boreum quadrangle
- Mare Cognitum
- Mare Crisium
- Mare Desiderii
- Mare Erythraeum
- Mare Fecunditatis
- Mare Frigoris
- Mare Humboldtianum
- Mare Humorum
- Mare Imbrium
- Mare Ingenii
- Mare Insularum
- Mare Marginis
- Mare Moscoviense
- Mare Nectaris
- Mare Nubium
- Mare Orientale
- Mare Serenitatis
- Mare Smythii
- Mare Spumans
- Mare Tranquillitatis
- Mare Tyrrhenum quadrangle
- Mare Undarum
- Mare Vaporum
- Marek Kukula
- Marek Sikora (astronomer)
- Marek Wolf
- Marengo warehouse
- Mareotis Fossae
- Mareta West
- Marfak
- Marg Osburne
- Margaret (moon)
- Margaret Adebisi Sowunmi
- Margaret Bradshaw
- Margaret Bryan Davis
- Margaret Burbidge
- Margaret Flamsteed
- Margaret G. Kivelson
- Margaret Geller
- Margaret Hamilton (software engineer)
- Margaret Lindsay Huggins
- Margaret M. Jacoby Observatory
- Margaret Mary Ray
- Margaret Meyer
- Margaret Rhea Seddon
- Margaret Turnbull
- Margaret W. "Hap" Brennecke
- Margaretha Kirch
- Margaretta Palmer
- Margarita Marinova
- Margaritifer Sinus quadrangle
- Margarito C. Garza
- Margherita Hack
- Margin of exposure
- Margita Kresáková
- Margret Helgadottir
- Margret Rey
- Marguerite Laugier
- Mari (crater)
- Mari Kotani
- Maria A. Barucci
- Maria Assumpció Català i Poch
- Maria Bianca Cita
- Maria Celeste (crater)
- Maria Clara Eimmart
- Maria Cunitz
- Maria DeLuca
- Maria Fidecaro
- Maria Klenova
- Maria Manaseina
- Maria Margaretha Kirch
- Maria Mitchell
- Maria Mitchell Association
- Maria Olech
- Maria Sinukuan
- Maria Teohari
- Maria Zhilova
- Maria Zuber
- Mariam Sultana
- Mariam al-Asturlabi
- Marian Albertovich Kowalski
- Marian Wolfgang Koller
- Mariana Trench
- Mariangela Lisanti
- Marianne Dreams
- Marianne Merchez
- Marianne Walck
- Maribou State
- Marica Branchesi
- Marici (Buddhism)
- Marie Byrd Land Volcanic Province
- Marie Machacek
- Marie Rådbo
- Marie-Jean-Léon, Marquis d'Hervey de Saint Denys
- Marie-Jeanne de Lalande
- Marihuana (1936 film)
- Marija Strojnik Scholl
- Marijan Prosen
- Marijn Franx
- Marika Taylor
- Mariko (crater)
- Marilyn Hacker
- Marilyn Raphael
- Marina Galand
- Marina Popovich
- Marine Doom
- Marine Environmental Data and Information Network
- Marine Geodesy
- Marine Geology (journal)
- Marine Isotope Stage 11
- Marine Isotope Stage 13
- Marine Isotope Stage 5
- Marine Science Co-ordination Committee
- Marine Technology Society
- Marine and Petroleum Geology
- Marine band (geology)
- Marine biogeochemical cycles
- Marine chemist
- Marine clay
- Marine cloud brightening
- Marine counterparts of land creatures
- Marine debris
- Marine ecosystem
- Marine geology
- Marine habitats
- Marine ice sheet instability
- Marine isotope stage
- Marine optical buoy
- Marine outfall
- Marine protected area
- Marine regression
- Marine sandglass
- Marine spatial planning
- Marine technology
- Marine transfer operations
- Marine transgression
- MarineTraffic
- Mariner (crater)
- Mariner 1
- Mariner 10
- Mariner 2
- Mariner 3
- Mariner 4
- Mariner 5
- Mariner 6 and 7
- Mariner 8
- Mariner 9
- Mariner Mark II
- Mariner program
- Mariner's astrolabe
- Mariners Weather Log
- Marinitoga piezophila
- Marino Dusić
- Marinoan glaciation
- Marinobacter algicola
- Marinobacter bryozoorum
- Marinobacter daepoensis
- Marinobacter daqiaonensis
- Marinobacter excellens
- Marinobacter flavimaris
- Marinobacter koreensis
- Marinobacter lacisalsi
- Marinobacter lipolyticus
- Marinobacter maritimus
- Marinobacter mobilis
- Marinobacter nitratireducens
- Marinobacter oulmenensis
- Marinobacter pelagius
- Marinobacter persicus
- Marinobacter psychrophilus
- Marinobacter sediminum
- Marinobacter segnicrescens
- Marinobacter shengliensis
- Marinobacter vinifirmus
- Marinobacter xestospongiae
- Marinobacter zhejiangensis
- Marinomonas arctica
- Marinus (crater)
- Marinus Vertregt
- Marinus of Neapolis
- Mario & Luigi: Dream Team
- Mario Acuña
- Mario Bettinus
- Mario Giovinetto
- Mario Guiducci
- Mario Hamuy
- Mario Jurić
- Mario Livio
- Mario Ochoa (DJ)
- Mario Pino Quivira
- Mario Runco Jr.
- Mario Schenberg (Gravitational Wave Detector)
- Marion Dietrich
- Marion Power Shovel Company
- Marion Zimmer Bradley
- Marion Zimmer Bradley's Darkover
- Mariotte (crater)
- Mariotte's bottle
- Marisat
- Marisat 1
- Marisat 2
- Marisat 3
- Maritime Aquarium at Norwalk
- Maritime Continent
- Maritime Express
- Maritime Launch Services
- Maritime Monitoring and Messaging Microsatellite
- Maritime Plain
- Maritime Telecommunications Network
- Maritime geography
- Maritza Soto
- Marius (crater)
- Marius Dewilde
- Marius Hills
- Marja Väisälä
- Marjanah (crater)
- Marjorie Anthony Linden
- Marjorie Clarke
- Marjorie Gubelmann
- Marjorie Hall Harrison
- Marjorie Townsend
- Mark A. Johnson
- Mark A. O'Neill
- Mark Adler
- Mark Alsop
- Mark Anthony (DJ)
- Mark Armstrong (astronomer)
- Mark Beaumont (cyclist)
- Mark Blagrove
- Mark C. Lee
- Mark Crowe
- Mark Dyurgerov
- Mark Farina
- Mark Green (bishop)
- Mark H. Thiemens
- Mark Hellinger Theatre
- Mark Hempsell
- Mark II (radio telescope)
- Mark III (radio telescope)
- Mark III Stellar Interferometer
- Mark Kamins
- Mark Kelly
- Mark L. Polansky
- Mark L. Van Name
- Mark Leon
- Mark M. Phillips
- Mark Meier
- Mark N. Brown
- Mark P. Stucky
- Mark Picchiotti
- Mark R. Morris
- Mark R. Showalter
- Mark Rober
- Mark Serov
- Mark Sherry
- Mark Shuttleworth
- Mark Thompson (astronomer)
- Mark Trodden
- Mark Trueblood
- Mark Twain (crater)
- Mark Way
- Mark Welser
- Markarian 177
- Markarian 231
- Markarian 335
- Markarian 421
- Markarian 501
- Markarian galaxies
- Markarian's Chain
- Marker horizon
- Markerwaard
- Marketing of Halo 3
- Markham Arms, Chelsea
- Marklund convection
- Markov (crater)
- Markree Observatory
- Markus Kissler-Patig
- Marlborough Cinema
- Marleen S. Barr
- Marlo Hoogstraten
- Marman clamp
- Marmorhaus
- Maroon (rocket)
- Marooned (1969 film)
- Marooned (Red Dwarf)
- Marooned (instrumental)
- Marooned (novel)
- Marooned off Vesta
- Marooned on Eden
- Marooned on Mars
- Marquardt Space Sled
- Marquez crater
- Marratt and Ellis Opticians
- Marriage at Cana
- Marriage bed of Henry VII
- Married (radio series)
- Marrow (novel)
- Mars
- Mars & Avril
- Mars (1930 film)
- Mars (1968 film)
- Mars (2016 TV series)
- Mars (comics)
- Mars (mythology)
- Mars 1
- Mars 1M
- Mars 1M No.1
- Mars 1M No.2
- Mars 2
- Mars 2020
- Mars 2112
- Mars 2M No.521
- Mars 2M No.522
- Mars 2MV-3 No.1
- Mars 2MV-4 No.1
- Mars 3
- Mars 4
- Mars 5
- Mars 5M
- Mars 6
- Mars 7
- Mars 96
- Mars Analogue Research Station Program
- Mars Astrobiology Explorer-Cacher
- Mars Attacks
- Mars Attacks!
- Mars Base Camp
- Mars Climate Orbiter
- Mars Crossing
- Mars Cube One
- Mars Daybreak
- Mars Desert Research Station
- Mars Design Reference Mission
- Mars Direct
- Mars Environmental Dynamics Analyzer
- Mars Excursion Module
- Mars Exploration Joint Initiative
- Mars Exploration Program
- Mars Exploration Rover
- Mars Express
- Mars Geyser Hopper
- Mars Global Surveyor
- Mars Gravity Biosatellite
- Mars Hand Lens Imager
- Mars Helicopter Ingenuity
- Mars Institute
- Mars Is Heaven!
- Mars Life
- Mars Matrix
- Mars MetNet
- Mars Micro Orbiter
- Mars Microspacecraft Missions
- Mars Mountain
- Mars Multispectral Imager for Subsurface Studies
- Mars Needs Moms
- Mars Needs Women
- Mars Observer
- Mars One
- Mars Orbiter Mission
- Mars Orbiter Mission 2
- Mars Organic Molecule Analyser
- Mars Outpost
- Mars Oxygen ISRU Experiment
- Mars Pathfinder
- Mars Piloted Orbital Station
- Mars Plant Experiment
- Mars Plus
- Mars Polar Lander
- Mars Probes
- Mars Radiation Environment Experiment
- Mars Rafikov
- Mars Reconnaissance Orbiter
- Mars Rising
- Mars Saga
- Mars Science Laboratory
- Mars Society
- Mars Society Australia
- Mars Space Flight Facility
- Mars Student Imaging Project
- Mars Surveyor 2001
- Mars Telecommunications Orbiter
- Mars University
- Mars aircraft
- Mars analog habitat
- Mars and Beyond
- Mars atmospheric entry
- Mars cycler
- Mars effect
- Mars flyby
- Mars general circulation model
- Mars habitability analogue environments on Earth
- Mars habitat
- Mars hoax
- Mars in culture
- Mars in fiction
- Mars jar
- Mars landing
- Mars monolith
- Mars ocean hypothesis
- Mars orbit rendezvous
- Mars race
- Mars regional atmospheric modeling system
- Mars rover
- Mars sample-return mission
- Mars suit
- Mars surface color
- Mars to Stay
- Mars trilogy
- Mars trojan
- Mars-Aster
- Mars-Grunt
- Mars: War Logs
- MarsDial
- Marsbook
- Marseille Observatory
- Marsh
- Marsh Ecology Award
- Marsh gas
- Marsha Ivins
- Marshal Henry Wrubel
- Marshall Kay
- Marshall Savage
- Marshall Space Flight Center
- Marshall Tymn
- Marshall coil
- Marshmello
- Marsokhod
- Marsquake
- Marta Burgay
- Marta Graciela Rovira
- Martand Sun Temple
- Marte Vallis
- Marth (Martian crater)
- Marth (lunar crater)
- Martha P. Haynes
- Martha Savage
- Martial (crater)
- Martial arts film
- Martian
- Martian Craters
- Martian Gothic: Unification
- Martian Hop
- Martian Land
- Martian Memorandum
- Martian Monkey
- Martian Moons Exploration
- Martian Piloted Complex
- Martian Successor Nadesico
- Martian Summer
- Martian Time-Slip
- Martian canal
- Martian chaos terrain
- Martian dichotomy
- Martian lava tube
- Martian meteorite
- Martian polar ice caps
- Martian regolith simulant
- Martian soil
- Martian spherules
- Martian surface
- Martians Go Home (film)
- Martians, Go Home
- Martin A. Pomerantz
- Martin Andreasson
- Martin Asplund
- Martin Barstow
- Martin Bojowald
- Martin Brasier
- Martin Brendel
- Martin Burkenroad
- Martin C. Weisskopf
- Martin Connors
- Martin David Kruskal
- Martin Geffert
- Martin Gerzabek
- Martin Greenberg
- Martin H. Greenberg
- Martin Harwit
- Martin Hoek
- Martin Holdgate
- Martin J. Fettman
- Martin Leonard
- Martin Marietta Spacemaster
- Martin Mobberley
- Martin Mystery
- Martin Nievera
- Martin Quack
- Martin Rees
- Martin Ryle
- Martin Schwarzschild
- Martin Smith (academic)
- Martin Solveig
- Martin Stanislaus Brennan
- Martin Suhm
- Martin Tajmar
- Martin Tudor (science fiction activist)
- Martin Villeneuve
- Martin X-23 PRIME
- Martin and Lewis
- Martin van den Hove
- Martins (crater)
- Martinus Beijerinck
- Martin–Puplett interferometer
- Martius (month)
- Martyn J. Fogg
- Martynov (crater)
- Martz (crater)
- Martz Observatory
- Martí (crater)
- Martín Cortés de Albacar
- Martín Ignacio de Loyola
- Marune: Alastor 933
- Marusha
- Marvel: Ultimate Alliance
- Marvin (horror host)
- Marvin Kaye
- Marvin the Martian in the Third Dimension
- Mary (crater)
- Mary Acworth Evershed
- Mary Adela Blagg
- Mary Alice McWhinnie
- Mary Anne Frey
- Mary Anne Mohanraj
- Mary Brück
- Mary Carskadon
- Mary Clark Thompson Medal
- Mary Ellen Weber
- Mary Fowler
- Mary G. Steiner Egyptian Theatre
- Mary Helen Johnston
- Mary Jackson (engineer)
- Mary L. Cleave
- Mary Roach
- Mary Shelley's Frankenhole
- Mary Sherman Morgan
- Mary Somerville
- Mary Stewart's Merlin Trilogy
- Mary Voytek
- Mary Walsh: Open Book
- Mary Ward (scientist)
- Mary Wells
- Maryborough meteorite
- Maryhill Stonehenge
- Maryland Theatre (Hagerstown)
- Marystown Group
- María Teresa López Boegeholz
- María Teresa Ruiz
- María de los Ángeles Alvariño González
- Marília (meteorite)
- Masaaki Yamada
- Masahiko Arimachi
- Masahiro Koishikawa
- Masahiro Sakurai
- Masakatsu Aoki
- Masami Fukushima
- Masanori Hirasawa
- Masaru Arai
- Masaru Mukai
- Masatoshi Yoshino
- Masayuki Iwamoto
- Masayuki Kikuchi
- Masayuki Yanai
- Mascarene owls
- Mascletà
- Maser (rocket)
- Mashallah ibn Athari
- Mashya and Mashyana
- Masked Rider (TV series)
- Maskelyne (crater)
- Maskelynite
- Maskerade
- Maslama al-Majriti
- Mason (crater)
- Mason Gully (meteorite)
- Mason Peck
- Mason's Arms, Battersea
- Mason–Dixon line
- Maspalomas Station
- Mass Driver 1
- Mass Effect
- Mass Effect (video game)
- Mass Effect 2
- Mass Effect 2: Arrival
- Mass Effect 2: Kasumi – Stolen Memory
- Mass Effect 2: Lair of the Shadow Broker
- Mass Effect 2: Overlord
- Mass Effect 3
- Mass Effect 3: Citadel
- Mass Effect 3: Leviathan
- Mass Effect 3: Omega
- Mass Effect Galaxy
- Mass Effect Infiltrator
- Mass Effect: Andromeda
- Mass Effect: Andromeda (book series)
- Mass Effect: Ascension
- Mass Effect: Deception
- Mass Effect: Foundation
- Mass Effect: Legendary Edition
- Mass Effect: New Earth
- Mass Effect: Paragon Lost
- Mass Effect: Pinnacle Station
- Mass Effect: Redemption
- Mass Effect: Retribution
- Mass Effect: Revelation
- Mass Spectrometer for Planetary Exploration
- Mass attenuation coefficient
- Mass catcher
- Mass concentration (astronomy)
- Mass deficit
- Mass distribution
- Mass driver
- Mass in general relativity
- Mass ratio
- Mass segregation (astronomy)
- Mass spectrometry
- Mass wasting
- Mass-analyzed ion-kinetic-energy spectrometry
- Mass-to-light ratio
- Massacre Mafia Style
- Massage Parlor Murders!
- Massalia family
- Massey Medal
- Massif
- Massif Central
- Massilia eurypsychrophila
- Massimo Mazzucco
- Massimo del Pizzo
- Massive Australian Precambrian/Cambrian Impact Structure
- Massive compact halo object
- Massive gravity
- Mass–luminosity relation
- Mastcam-Z
- Masten Space Systems
- Master Chief (Halo)
- Master P
- Master of Orion
- Master of Orion II: Battle at Antares
- Master of Orion III
- Masterdome
- Mastering the Universe
- Masters at Work
- Masters of Doom
- Masters of Science Fiction
- Masters of the Universe
- Masters of the Universe (comics)
- Masters of the Universe (film)
- Masters of the Universe: The Arcade Game
- Masters of the Universe: The Movie
- Masters of the Universe: The Power of He-Man
- Masters of the Universe: The Super Adventure
- Masubi (volcano)
- Masursky (Martian crater)
- Masursky Award
- Mat Kaplan
- Matabei (crater)
- Matanuska (crater)
- Matara (crater)
- Matched filter
- Mate-Demate Device
- Matenadaran
- Matenadaran MS 7117
- Mateo & Matos
- Mater Matuta
- Material flow
- Materials Adherence Experiment
- Materials International Space Station Experiment
- Materials Science Laboratory
- Materials oscilloscope
- Maternity colony
- Mathematical Geosciences
- Mathematical universe hypothesis
- Mathematicism
- Mathematics of general relativity
- Mathis Mootz
- Mathisson–Papapetrou–Dixon equations
- Matias Zaldarriaga
- Matijevic Hill
- Matilda Mother
- Matinée (disco)
- Matisse (crater)
- Mato Grosso Plateau
- Matra Marconi Space
- Matrioshka brain
- Matrix isolation
- Matrix string theory
- Matrix theory (physics)
- Matroshka experiments
- Matryoshka (diamond)
- Matsuo Sugano
- Matt Darey
- Matt Fox (comics)
- Matt Guthmiller
- Matt Jefferies
- Matt Lebofsky
- Matt Mountain
- Matt O'Dowd (astrophysicist)
- Matt Ondler
- Matt Reeves
- Matt Schwartz
- Matt Stawicki
- Matt Taylor (scientist)
- Matt Wilson (crater)
- Matter (novel)
- Matter (venue)
- Matter collineation
- Matter power spectrum
- Matthesia
- Matthew 2
- Matthew 2:12
- Matthew 2:13
- Matthew 2:19
- Matthew 2:20–21
- Matthew 2:22
- Matthew 3:10
- Matthew 3:11
- Matthew 7:19–20
- Matthew Bailes
- Matthew Cable
- Matthew Dominick
- Matthew Fontaine Maury
- Matthew J. Holman
- Matthew Koma
- Matthew Looney
- Matthew Pothen Thekaekara
- Matthew Raper
- Matthew S
- Matthew Scott (Stargate)
- Matthias Bernegger
- Matthias Hafenreffer
- Matthias Maurer
- Matthias Steinmetz
- Matthiola longipetala
- Mattig formula
- Mattithiah ben Solomon Delacrut
- Mattress
- Mattress coil
- Mattress pad
- Mattress protector
- Maturity (geology)
- Maturity (sedimentology)
- Maughanasilly Stone Row
- Maui Patera
- Maul Camera Rocket
- Maumee Valles
- Mauna Kea Observatories
- Mauna Loa
- Mauna Loa Solar Observatory
- Maunakea Spectroscopic Explorer
- Maunder (Martian crater)
- Maunder (lunar crater)
- Maunder Minimum
- Maundy (foot washing)
- Maupertuis (crater)
- Maura McLaughlin
- Maura Tombelli
- Maureen Raymo
- Mauretania Public House
- Mauri S. Pelto
- Mauri Valtonen
- Maurice Ewing
- Maurice Key
- Maurice Woodward
- Maurice du Martheray
- Mauritius Radio Telescope
- Maurits Lindström
- Maurizio Cheli
- Mauro Biglino
- Mauro Francaviglia
- Maurolycus (crater)
- Maury (crater)
- Mausumi Dikpati
- Mauvais Sang
- Mawrth Vallis
- Mawson Arms
- Mawu
- Max Evans (Roswell)
- Max Gordon (Village Vanguard founder)
- Max Jammer
- Max Kramer
- Max Launch Abort System
- Max Pettini
- Max Planck Institute for Astronomy
- Max Planck Institute for Astrophysics
- Max Planck Institute for Biogeochemistry
- Max Planck Institute for Evolutionary Biology
- Max Planck Institute for Extraterrestrial Physics
- Max Planck Institute for Physics and Astrophysics
- Max Planck Institute for Plasma Physics
- Max Planck Institute for Radio Astronomy
- Max Planck Institute for Solar System Research
- Max Q (astronaut band)
- Max Sedgley
- Max Tegmark
- Max Valier
- Max Valier (satellite)
- Max Waldmeier
- Max Wolf
- Maxar Technologies
- Maxim DL
- Maxime Faget
- Maximilian Hell
- Maximum Overdrive
- Maximum Shame
- Maximum acceptable toxicant concentration
- Maximum elevation figure
- Maximum entropy spectral estimation
- Maximum-value composite procedure
- Maxine Linehan
- Maxus (rocket)
- Maxwell (crater)
- Maxwell Montes
- Maxwell's equations in curved spacetime
- Maxwell–Boltzmann distribution
- Maxwell–Jüttner distribution
- Maxwell–Wagner–Sillars polarization
- May 1921 geomagnetic storm
- May Kaftan-Kassim
- Maya astronomy
- Maya calendar
- Maya cave sites
- Maya codices
- Maya moon goddess
- Maya-1
- Mayall II
- Mayall's Object
- Mayan Theater
- Mayanism
- Mayari
- Mayda Insula
- Mayfair Theatre, Ottawa
- Mayly Sánchez
- Maynard F. Jordan Observatory
- Maynard Pittendreigh
- Mayon Planetarium and Science Park
- Maypole in the Strand
- Maz Kanata
- Maza of the Moon
- Mazaalai (satellite)
- Mazhamangalam Narayanan Namboodiri
- Mazlan Othman
- Mazuku
- Mazzaroth
- Mbozi meteorite
- McAdie (crater)
- McAuliffe (crater)
- McAuliffe-Shepard Discovery Center
- McCandless Lunar Lander
- McClure (crater)
- McCool Hill
- McCumber relation
- McDonald (crater)
- McDonald Observatory
- McDonald Park
- McDonald's Treasure Land Adventure
- McDonnell Douglas Barbarian
- McDonnell Douglas DC-X
- McKellar (crater)
- McKendree cylinder
- McKim Observatory
- McLaughlin (Martian crater)
- McLaughlin (lunar crater)
- McLaughlin Planetarium
- McMath (crater)
- McMath–Hulbert Observatory
- McMath–Pierce solar telescope
- McMillin Observatory
- McMurdo (crater)
- McNair (crater)
- McNally (crater)
- McNeil's Nebula
- McNulty rhyolite
- McWane Science Center
- Me Plus One (Kasabian song)
- Mead (crater)
- Mead Observatory
- Meade Instruments
- Meade LX90
- Meade Layne
- Mealworm
- Mean High Water
- Mean anomaly
- Mean high water springs
- Mean longitude
- Mean low water spring
- Mean motion
- Meander
- Meanings of minor planet names
- Meanings of minor planet names: 237001–238000
- Measure problem (cosmology)
- Measured environmental concentration
- Measurement of biodiversity
- Measurement of sea ice
- Meatball Machine
- Meatball soup
- Mecca Time
- Mechanical counterpressure suit
- Mechanical explanations of gravitation
- Mechanically stimulated gas emission
- Mechanochromism
- Mechnikov (crater)
- Mechocracy
- Meco
- MedStar duology
- Medea hypothesis
- Medea: Harlan's World
- Medha Sūktam
- Median lethal dose
- Median toxic dose
- Medical astrology
- Medical gown
- Medical toxicology
- Medical treatment during spaceflight
- Medici column
- Medicina Radio Observatory
- Medicine 8
- Medicine Hat Ocean
- Mediocrity principle
- Mediterranean Bauxite Province
- Mediterranean Biogeographic Region
- Mediterranean Ridge
- Mediterranean forests, woodlands, and scrub
- Mediterranean wetlands
- Medium Earth orbit
- Medium Energy Ion Scattering Facility
- Medium-lift launch vehicle
- Medusa Nebula
- Medusae Fossae Formation
- Medvednica Fault Zone
- Mee (crater)
- Meenakshi Wadhwa
- MeerKAT
- Mees (crater)
- Meet Me in St. Louis
- Meet the Feebles
- Meet the World
- Meg Urry
- Mega Ampere Spherical Tokamak
- Mega Man 10
- Mega Man IV (Game Boy)
- Mega Man V (Game Boy)
- Mega Man X4
- Mega Man X8
- Mega-Earth
- MegaBox (shopping mall)
- MegaFlyover
- MegaTransect
- MegaWars
- MegaWars III
- Megaclite
- Megaderma
- Megadiverse countries
- Megagroove
- Megalithic architectural elements
- Megamaser
- Megamind
- Megan Schwamb
- Megastar (projector)
- Megathermal
- Megatripolis
- Megatsunami
- Meggers (crater)
- Megha-Tropiques
- Meghnad Saha
- Mehalso Observatory
- Mei (Overwatch)
- Mei-Ching Fok
- Mein (song)
- Meinzer Award
- Meiothermus
- Meiothermus timidus
- Meissa
- Meitner (Venusian crater)
- Meitner (lunar crater)
- Mekton
- Mel Oliver and Space Rover on Mars
- Melainabacteria
- Melaka Planetarium
- Melaka virus
- Melancholia (2011 film)
- Melanie Johnston-Hollitt
- Melanocratic rock
- Melanopsin
- Melanosome (geology)
- Melanthius (crater)
- Melas Chasma
- Melatonin
- Melatonin receptor
- Melatonin receptor 1A
- Melatonin receptor 1B
- Melatonin receptor 1C
- Melba Roy Mouton
- Melbourne Cabaret Festival
- Melbourne Museum
- Melchior Inchofer
- Meld (Star Trek: Voyager)
- Melghirimyces algeriensis
- Melghirimyces thermohalophilus
- Melinda Darby Dyar
- Melinoë
- Melissa (philosopher)
- Melissa Jones
- Melissa McGrath
- Melissa Trainer
- Melissopalynology
- Melleny Melody
- Mellish (crater)
- Melnick 34
- Melnick 42
- Melon heads
- Melotte 186
- Melotte catalogue
- Melrose Pyrotechnics
- Melt pond
- Meltdown (Red Dwarf)
- Meltdown (bar chain)
- Melton Memorial Observatory
- Meltwater
- Meltwater pulse 1A
- Meltwater pulse 1B
- Melville (crater)
- Membrane mirror
- Membrane paradigm
- Memnonia quadrangle
- Memorial Museum of Cosmonautics
- Memories with Maya
- Memory Lane (audio drama)
- Memory foam
- Memphis Facula
- Men (deity)
- Men at Arms
- Men in Black (1997 film)
- Men in Black 3
- Men in Black II
- Men in Black: Alien Attack
- Men in Black: International
- Men in black
- Men into Space
- Mena (Mercurian crater)
- Menace (video game)
- Menace from the Moon (1925 novel)
- Mendel (Martian crater)
- Mendel (lunar crater)
- Mendel Sachs
- Mendel-Rydberg Basin
- Mendeleev (crater)
- Mendelssohn (crater)
- Mendenhall Observatory
- Mendes Pinto (crater)
- Mene (goddess)
- Menelaus (crater)
- Menfro
- Meng-p'o Macula
- Mengla dianlovirus
- Meniscus corrector
- Menke Observatory
- Menologia rustica
- Menrva (crater)
- Mensa (constellation)
- Mensa (geology)
- Mental projection
- Mentats of Dune
- Mentawai scops owl
- Menteng Cinema
- Mentore Maggini
- Mentzelia lindleyi
- Mentzelia pumila
- Menzel (crater)
- Meow (film)
- Mephisto Odyssey
- Meprobamate
- Mera ur kärlekens språk
- Merate Astronomical Observatory
- Mercator (crater)
- Mercator 1569 world map
- Mercator Research Institute on Global Commons and Climate Change
- Mercator Telescope
- Mercedes López-Morales
- Mercedes Pascual
- Mercedes Reaves
- Mercedes Richards
- Mercedonius
- Mercenary (video game)
- Mercer 3
- Mercers Arms, Covent Garden
- Mercier criterion
- Mercurius (crater)
- Mercury (2005 novel)
- Mercury (magazine)
- Mercury (metadata search system)
- Mercury (mythology)
- Mercury (planet)
- Mercury (satellite)
- Mercury 13
- Mercury 13 (film)
- Mercury Control Center
- Mercury Passing Before the Sun
- Mercury Seven
- Mercury in fiction
- Mercury nano-trap water filtration
- Mercury's magnetic field
- Mercury-Atlas
- Mercury-Atlas 1
- Mercury-Atlas 10
- Mercury-Atlas 2
- Mercury-Atlas 3
- Mercury-Atlas 4
- Mercury-Atlas 5
- Mercury-Atlas 6
- Mercury-Atlas 7
- Mercury-Atlas 8
- Mercury-Atlas 9
- Mercury-Jupiter
- Mercury-P
- Mercury-Redstone 1
- Mercury-Redstone 1A
- Mercury-Redstone 2
- Mercury-Redstone 3
- Mercury-Redstone 4
- Mercury-Redstone BD
- Mercury-Redstone Launch Vehicle
- Mercury-Scout 1
- Mercury-arc valve
- Mercury-manganese star
- Mercury-vapor lamp
- Mercy (Muse song)
- Meri (mythology)
- Meribah
- Meridian (astronomy)
- Meridian (geography)
- Meridian 1
- Meridian 2
- Meridian 3
- Meridian 4
- Meridian 5
- Meridian 6
- Meridian arc
- Meridian circle
- Meridian of Antwerp
- Meridiani Planum
- Merieme Chadid
- Merit Ptah (crater)
- Merivale Molyneux
- Merlin
- Merlin (2008 TV series)
- Merlin (Albéniz)
- Merlin (Kayak album)
- Merlin (Robinson)
- Merlin (miniseries)
- Merlin (musical)
- Merlin (poem)
- Merlin (series 1)
- Merlin (series 2)
- Merlin (series 3)
- Merlin (series 4)
- Merlin (series 5)
- Merlin Book 1: The Lost Years
- Merlin Book 2: The Seven Songs
- Merlin Book 3: The Raging Fires
- Merlin Book 4: The Mirror of Fate
- Merlin Book 5: A Wizard's Wings
- Merlin and the Dragons
- Merlin and the War of the Dragons
- Merlin in comics
- Merlin – Bard of the Unseen
- Merlin's Apprentice
- Merlin's Cave
- Merlin's Ring
- Merlin's Shop of Mystical Wonders
- Merlin's Wood
- Merlin: The Quest Begins
- Merlin: The Return
- Merope (star)
- Merrill (crater)
- Merrillite
- Mersenius (crater)
- Merton E. Davies
- Mervyn A. Ellison
- Mesa Redonda fire
- Mesa of Lost Women
- Mesha Sankranti
- Meshcherskiy (crater)
- Meshir
- Mesklin
- Mesoamerican Long Count calendar
- Mesoamerican creation myths
- Mesocrista
- Mesohabitat simulation model
- Mesopause
- Mesopelagic zone
- Mesoplanet
- Mesoplates
- Mesopotamia, Argentina
- Mesopotamian divination
- Mesoregion (geomorphology)
- Mesori
- Mesosphere
- Mesotrophic soil
- Mesozoic
- Mesozoic–Cenozoic radiation
- Mesquito
- Message Abstraction Layer
- Message from Space
- Message from space (science fiction)
- Message in a bottle
- Messala (crater)
- Messidor
- Messier (crater)
- Messier 10
- Messier 100
- Messier 102
- Messier 103
- Messier 105
- Messier 106
- Messier 107
- Messier 108
- Messier 109
- Messier 110
- Messier 12
- Messier 13
- Messier 14
- Messier 15
- Messier 18
- Messier 19
- Messier 2
- Messier 21
- Messier 22
- Messier 23
- Messier 25
- Messier 26
- Messier 28
- Messier 29
- Messier 3
- Messier 30
- Messier 32
- Messier 34
- Messier 35
- Messier 36
- Messier 37
- Messier 38
- Messier 39
- Messier 4
- Messier 41
- Messier 43
- Messier 46
- Messier 47
- Messier 48
- Messier 49
- Messier 5
- Messier 50
- Messier 52
- Messier 53
- Messier 54
- Messier 55
- Messier 56
- Messier 58
- Messier 59
- Messier 60
- Messier 61
- Messier 62
- Messier 63
- Messier 65
- Messier 66
- Messier 67
- Messier 68
- Messier 69
- Messier 7
- Messier 70
- Messier 71
- Messier 72
- Messier 73
- Messier 74
- Messier 75
- Messier 77
- Messier 78
- Messier 79
- Messier 80
- Messier 81
- Messier 82
- Messier 83
- Messier 84
- Messier 85
- Messier 86
- Messier 87
- Messier 88
- Messier 89
- Messier 9
- Messier 90
- Messier 91
- Messier 92
- Messier 93
- Messier 94
- Messier 95
- Messier 96
- Messier 98
- Messier 99
- Messier marathon
- Messier object
- Messina Chasmata
- Messina astronomical clock
- Messinian erosional crisis
- Messinian evaporite
- Messinian salinity crisis
- Met Office
- Met Office Hadley Centre
- MetOp
- MetOp-SG
- Meta Knight
- Meta-cold dark matter
- Metacresol purple
- Metagenomics
- Metal (wuxing)
- Metal Armor Dragonar
- Metal Arms: Glitch in the System
- Metal Knight
- Metal L-edge
- Metal-halide lamp
- Metal-mesh optical filter
- Metalaw
- Metaliferi Mountains
- Metallicity
- Metallicity distribution function
- Metallogeny
- Metallosphaera
- Metallosphaera hakonensis
- Metallosphaera sedula
- Metallotolerant
- Metallurgical coal
- Metalocalypse
- Metalstorm: The Destruction of Jared-Syn
- Metamorphism
- Metanil Yellow
- Metaproteomics
- Metashape
- Metasilicic acid
- Metasomatism
- Metatranscriptomics
- Metavolcanic rock
- Meteor (film)
- Meteor (miniseries)
- Meteor (rocket)
- Meteor (satellite)
- Meteor (train)
- Meteor Apocalypse
- Meteor Crater
- Meteor Storm
- Meteor burst communications
- Meteor procession
- Meteor shower
- Meteor!
- Meteor-1 1
- Meteor-3M No.1
- Meteor-M No.1
- Meteor-M No.2
- Meteor-M No.2-1
- Meteoric iron
- Meteorite
- Meteorite classification
- Meteorite fall
- Meteorite fall statistics
- Meteorite find
- Meteorite hunting
- Meteorite shock stage
- Meteorite weathering
- Meteoritical Society
- Meteoritical Society's Service Award
- Meteoritics
- Meteoritics & Planetary Science
- Meteoroid
- Meteoroid Technology Satellite
- Meteorological & Geoastrophysical Abstracts
- Meteorological Applications
- Meteorological Monographs
- Meteorologische Zeitschrift
- Meteorology
- Meteos
- Meteosat
- Meteosat 8
- Meteosat visible and infrared imager
- Methane on Mars
- MethaneSAT
- Methanimicrococcus
- Methanobacteria
- Methanobacteriaceae
- Methanobacteriales
- Methanobacterium
- Methanobrevibacter
- Methanobrevibacter curvatus
- Methanobrevibacter cuticularis
- Methanobrevibacter filiformis
- Methanobrevibacter gottschalkii
- Methanobrevibacter oralis
- Methanobrevibacter smithii
- Methanobrevibacter thaueri
- Methanobrevibacter woesei
- Methanobrevibacter wolinii
- Methanocalculus
- Methanocalculus halotolerans
- Methanocaldococcaceae
- Methanocaldococcus
- Methanocaldococcus jannaschii
- Methanocaldococcus sp. FS406-22
- Methanocella paludicola
- Methanococcaceae
- Methanococcales
- Methanococci
- Methanococcoides
- Methanococcoides burtonii
- Methanococcoides methylutens
- Methanococcus
- Methanococcus maripaludis
- Methanocorpusculaceae
- Methanocorpusculum
- Methanoculleus
- Methanoculleus hydrogenitrophicus
- Methanoculleus submarinus
- Methanofollis
- Methanogen
- Methanogenium
- Methanogenium boonei
- Methanogenium frigidum
- Methanogenium marinum
- Methanohalobium
- Methanohalophilus
- Methanohalophilus mahii
- Methanol economy
- Methanol toxicity
- Methanolacinia
- Methanolobus
- Methanolobus profundi
- Methanolobus tindarius
- Methanomethylovorans
- Methanomethylovorans hollandica
- Methanomethylovorans thermophila
- Methanomicrobia
- Methanomicrobiaceae
- Methanomicrobiales
- Methanomicrobium
- Methanoplanus
- Methanoplanus endosymbiosus
- Methanopyraceae
- Methanopyrales
- Methanopyri
- Methanopyrus
- Methanoregula
- Methanosaeta
- Methanosaeta concilii
- Methanosaetaceae
- Methanosalsum
- Methanosarcina
- Methanosarcina acetivorans
- Methanosarcina barkeri
- Methanosarcina thermophila
- Methanosarcinaceae
- Methanosarcinales
- Methanosphaera
- Methanosphaera stadtmaniae
- Methanospirillaceae
- Methanospirillum
- Methanothermaceae
- Methanothermobacter
- Methanothermobacter marburgensis
- Methanothermococcus
- Methanothermococcus okinawensis
- Methanothermus
- Methanothermus fervidus
- Methanothermus sociabilis
- Methanothrix soehngenii
- Methanotorris
- Methaqualone
- Metharbital
- Methods of detecting exoplanets
- Methods of pluton emplacement
- Methohexital
- Methone (moon)
- Methuselah's Children
- Methyl orange
- Methyl radical
- Methyl red
- Methyl violet
- Methyl yellow
- Methylacidiphilum infernorum
- Methylophaga muralis
- Methylophaga thiooxydans
- Methylorosula polaris
- Methylosphaera hansonii
- Methylphenobarbital
- Metis (moon)
- Metis (mythology)
- Metius (crater)
- Metizolam
- Metomidate
- Meton (crater)
- Metonic cycle
- Metric-affine gravitation theory
- Metro Cinema Edmonton
- Metro Theatre (Toronto)
- Metrodorus of Cos
- Metrograph
- Metroid
- Metroid (fictional species)
- Metroid (video game)
- Metroid Dread
- Metroid Fusion
- Metroid II: Return of Samus
- Metroid Prime
- Metroid Prime 2: Echoes
- Metroid Prime 3: Corruption
- Metroid Prime 4
- Metroid Prime Hunters
- Metroid Prime Pinball
- Metroid Prime: Federation Force
- Metroid Prime: Trilogy
- Metroid: Other M
- Metroid: Samus Returns
- Metroid: Zero Mission
- Metropolitan Beacon System
- Metsähovi Radio Observatory
- Metztli
- Meudon Great Refractor
- Mexican Satellite System
- Mexican funnel-eared bat
- Mexican handcrafted fireworks
- Mexican sex comedy
- Mexico City fireworks disaster
- Mexploitation
- Mexsat-3
- Meyer–Womble Observatory
- Mezcalera Ocean
- Mezen Basin
- Mezentsev (crater)
- Mezzoramia (Titan)
- Me²
- Meṣa
- Mi-Go
- MiGFlug
- MiMi Aung
- MiTAC
- MiTAC Computing Technology Corp.
- MiTAC Holdings
- MiTEx
- Miami (soil)
- Miami Connection
- Mian Chin
- Miasma theory
- MicMac (software)
- Mice Galaxies
- Michael A'Hearn
- Michael A. Baker
- Michael A. Burstein
- Michael A. Dopita
- Michael Adelbulner
- Michael Alig
- Michael Alsbury
- Michael Anderson (director)
- Michael Ashley (astronomer)
- Michael Barratt (astronaut)
- Michael Barratt (television presenter)
- Michael Bay
- Michael Bicay
- Michael Bishop (author)
- Michael Bolte
- Michael Bublé
- Michael Bucks
- Michael C. Malin
- Michael C. Wholley
- Michael Carroll (space artist)
- Michael Chabon
- Michael Coats
- Michael Collins (astronaut)
- Michael Crichton
- Michael D. Leinbach
- Michael D. Reynolds
- Michael D. Swords
- Michael Dickinson (horseman)
- Michael E. Brown
- Michael E. Fossum
- Michael E. Uslan
- Michael Efroimsky
- Michael Ely
- Michael Fincke
- Michael Foale
- Michael Foreman (astronaut)
- Michael Freilich (oceanographer)
- Michael Friedman (philosopher)
- Michael G. Burton
- Michael Garrett (astronomer)
- Michael Gorra
- Michael Gray (DJ)
- Michael Guerin
- Michael H. Hart
- Michael H. Hecht
- Michael Hesemann
- Michael Hinchey
- Michael J. Adams
- Michael J. Belton
- Michael J. Bloomfield
- Michael J. Kurtz
- Michael J. McCulley
- Michael J. Mumma
- Michael J. Smith (astronaut)
- Michael Jackson's Halloween
- Michael James Gaffey
- Michael Julian Drake
- Michael Jäger (astronomer)
- Michael Kandel
- Michael Kasha
- Michael Kramer (astronomer)
- Michael Krohngold
- Michael L. Gernhardt
- Michael López-Alegría
- Michael Maestlin
- Michael McDerman
- Michael Mealling
- Michael Moorcock
- Michael Morris (oceanographer)
- Michael N. Mautner
- Michael Neander
- Michael Oppenheimer
- Michael Ovenden
- Michael P. Anderson
- Michael P. Kube-McDowell
- Michael Parsons, 6th Earl of Rosse
- Michael Perryman
- Michael Persinger
- Michael Proctor (academic)
- Michael Psellos
- Michael R. Clifford
- Michael R. Collings
- Michael R. Rampino
- Michael Rowan-Robinson
- Michael Ryschkewitsch
- Michael S. Hopkins
- Michael Smolensky
- Michael Sterling
- Michael Swanwick
- Michael Szameit
- Michael T. Good
- Michael Turner (cosmologist)
- Michael W. Friedlander
- Michael Weiss (engineer)
- Michael Whelan
- Michael William Feast
- Michael Woolfson
- Michael van Langren
- Michal Fulier
- Michał Falkener
- Michał Heller
- Michał Marek
- Michel Bernard (administrator)
- Michel Fournier (adventurer)
- Michel Giacobini
- Michel Gordillo
- Michel Jouvet
- Michel Mayor
- Michel Ory
- Michel Tognini
- Michelangelo (crater)
- Michele Bannister
- Michele Brekke
- Michele Dougherty
- Michele Koppes
- Michele Limon
- Michele Sainte
- Michelle Amos
- Michelle Rogan-Finnemore
- Michelle Thaller
- Michelson (crater)
- Michelson interferometer
- Michelson stellar interferometer
- Michiel Daniel Overbeek
- Michiel van der Klis
- Michigan Science Center
- Michigan meridian
- Michio Kaku
- Michoud Assembly Facility
- Mick West
- Mickey Oliver
- Mickey's Halloween Party
- Mickey's House of Villains
- Mickey's Not-So-Scary Halloween Party
- Mickey's PhilharMagic
- Mickiewicz (crater)
- Micky Modelle
- Micoud (Martian crater)
- MicrOmega-IR
- Micro black hole
- Micro-Imaging Dust Analysis System
- Micro-Space
- Micro-g environment
- Micro-spatially offset Raman spectroscopy
- Micro-spectrophotometry
- MicroBooNE
- MicroFUN
- MicroMSI
- Microbacteriaceae
- Microbacterium halotolerans
- Microbacterium sediminis
- Microbarom
- Microbat
- Microbial biodegradation
- Microbial biogeography
- Microbial ecology
- Microbial inoculant
- Microbial loop
- Microbial population biology
- Microbialite
- Microbiologically induced calcite precipitation
- Microbiology of decomposition
- Microbiology of oxygen minimum zones
- Microbiomes of the built environment
- Microbispora
- Microbolometer
- Microcinema
- Micrococcineae
- Microcosm (clock)
- Microcosm (video game)
- Microcystin
- Microecosystem
- Microfluidic modulation spectroscopy
- Microgravity Science Glovebox
- Microgravity University
- Microhypsibiidae
- Microlensing Observations in Astrophysics
- Microlites
- Micrometeorite
- Micrometeoroid
- Micromonosporaceae
- Micromégas
- Microplasma
- Microplastics
- Micropower impulse radar
- Microprobe
- Micropub
- Microquasar
- Microsat (ISRO)
- Microsat-R
- Microscopium
- Microscopium Supercluster
- Microscopium Void
- Microscopium in Chinese astronomy
- Microsleep
- Microsoft Space Simulator
- Microspherulite
- Microtox bioassay
- Microturbulence
- Microwave Imaging Radiometer with Aperture Synthesis
- Microwave Ionosphere Nonlinear Interaction Experiment
- Microwave Radiometer (Juno)
- Microwave Sounding Unit temperature measurements
- Microwave electrothermal thruster
- Microwave humidity sounder
- Microwave limb sounder
- Microwave radiometer
- Microwave sounding unit
- Microwave spectroscopy
- Mid Atlantic Star Party
- Mid-Atlantic Regional Spaceport
- Mid-Atlantic Regional Spaceport Launch Pad 0
- Mid-Autumn Festival
- Mid-Brunhes Event
- Mid-Pleistocene Transition
- Mid-air retrieval
- Mid-ocean ridge
- MidSTAR-1
- Midaflur
- Midcourse Space Experiment
- Middle American screech owl
- Middle East respiratory syndrome
- Middle East respiratory syndrome–related coronavirus
- Middle latitudes
- Middle-Urals Ring Structure
- Middle-of-the-night insomnia
- Middlesboro crater
- Middlesbrough meteorite
- Midgard
- Midheaven
- Midland Theatre
- Midland Theatre (Newark, Ohio)
- Midnight
- Midnight (1982 film)
- Midnight Monster Hop
- Midnight Mutants
- Midnight Patrol: Adventures in the Dream Zone
- Midnight movie
- Midnight sun
- Midpoint (astrology)
- Mie (crater)
- Mien (lake)
- Miga, Quatchi, Sumi and Mukmuk
- Might & Magic Heroes VI
- Might & Magic Heroes VII
- Might and Magic: Heroes Kingdoms
- Might and Magic: Heroes Online
- Mighty Ducks: The Animated Series
- Mighty Eagle
- Mighty Max (TV series)
- Mighty Milky Way
- Mighty Morphin Alien Rangers
- Mighty Morphin Power Rangers
- Mighty Morphin Power Rangers (re-version)
- Mighty Morphin Power Rangers (season 1)
- Mighty Morphin Power Rangers (season 2)
- Mighty Morphin Power Rangers (season 3)
- Mighty Morphin Power Rangers (video game)
- Mighty Morphin Power Rangers World Tour Live on Stage
- Mighty Morphin Power Rangers the Album: A Rock Adventure
- Mighty Morphin Power Rangers: The Fighting Edition
- Mighty Morphin Power Rangers: The Movie
- Mighty Morphin Power Rangers: The Movie (video game)
- MightySat-1
- MightySat-2.1
- Migma
- Migration Letters
- Miguel A. Catalán
- Miguel Hurtado
- Miguel Itzigsohn
- Miguel Rodríguez (NASA)
- Miguel Roman
- Miguel San Martín
- Mike Castro de Maria
- Mike Cruise
- Mike Dierickx
- Mike Edmunds
- Mike Glicksohn
- Mike Hodges
- Mike Irwin
- Mike Massimino
- Mike McNamara
- Mike Melluish
- Mike Melvill
- Mike Moses
- Mike Mullane
- Mike Parker Pearson
- Mike Ploog
- Mike Resnick
- Mike Rizzo
- Mike Schurr
- Mike Stanley (filmmaker)
- Mike Tyson Mysteries
- Mike Walsh (TV host)
- Mike Winters (comedian)
- Mike'd Up: The Francesa Sports Final
- Mikhail Dobriyan
- Mikhail Farikh
- Mikhail Karyukov
- Mikhail Kornienko
- Mikhail Lidov
- Mikhail Lomonosov
- Mikhail Tikhonravov
- Mikhail Tyurin
- Mikhail Yangel
- Mikhailo Lomonosov (satellite)
- Mikheil Vashakidze
- Mikko Tuomi
- Miklós Konkoly-Thege
- Mikoyan MiG-2000
- Mikoyan-Gurevich MiG-105
- Mikro Profitis Ilias
- Mikulski Archive for Space Telescopes
- Mikveh
- Milagro (experiment)
- Milan Antal
- Milan Cathedral
- Milan M. Ćirković
- Milan Rastislav Štefánik
- Milankovič (Martian crater)
- Milankovič (lunar crater)
- Mild-slope equation
- Mildred B. Mitchell
- Miles Bland
- Miles from Tomorrowland
- Milford (crater)
- Milichius (crater)
- Milieudefensie
- Militarisation of space
- Military Orbital Development System
- Military Soyuz
- Military geology
- Military meteorology
- Military satellite
- Milky Way
- Milky Way (mythology)
- MilkyWay@home
- Mill pond
- Millbillillie (meteorite)
- Millennium 2.2
- Millennium Falcon
- Millennium Falcon (novel)
- Millennium Run
- Millennium Seed Bank Partnership
- Millennium Star Atlas
- Miller (crater)
- Miller Observatory
- Millers River (Middlesex)
- Millie Dollar
- Millie Hughes-Fulford
- Millikan (crater)
- Millimeter Anisotropy eXperiment IMaging Array
- Million Dollar Extreme Presents: World Peace
- Million Dollar Theater
- Millisecond pulsar
- Millochau (crater)
- Mills (crater)
- Mills Cross Array
- Mills Cross Telescope
- Mills Observatory
- Millstone Hill
- Milne (crater)
- Milne Cheetham
- Milne model
- Milnesium tardigradum
- Milo McBryde
- Milo of Croton
- Milorad B. Protić
- Miloš Tichý
- Milstar
- Milt Heflin
- Milthorpe Lecture
- Milton (crater)
- Milton A. Rothman
- Milton J. Rubenstein Museum of Science and Technology
- Milton Klein (engineer)
- Milton L. Humason
- Milton Orville Thompson
- Milton Rosen
- Milton Silveira
- Milton Wainwright
- Milton William Cooper
- Milton Windler
- Milutin Milanković
- Milwaukee Astronomical Society
- Milwaukee Deep
- Mima mounds
- Mimas (moon)
- Mimosa (star)
- Minahassa masked owl
- Minal Rohit
- Minchinbury Sandstone
- MindRover
- Mindanao scops owl
- Mindolluin Montes
- Mindoro scops owl
- Mine exploration
- MineCam
- Mineo (meteorite)
- Mineral dust
- Mineral resource estimation
- Mineral spring
- Mineralium Deposita
- Mineralization (geology)
- Mineralization (soil science)
- Mineralized tissues
- Mineralogy of Mars
- Minerals Yearbook
- Minerotrophic
- Minerva (bird)
- Mines Museum of Earth Science
- Mines of Titan
- Minetta Creek
- Mineur (crater)
- Ming (DJ)
- Ming the Merciless
- Ming-Na Wen
- Mini theater
- Mini-Mag Orion
- Mini-Neptune
- Mini-RF
- Mini-TES
- MiniBooNE
- MiniGrail
- Miniature Exoplanet Radial Velocity Array
- Miniature Sensor Technology Integration-3
- Miniature X-ray Solar Spectrometer CubeSat
- Minicharged particle
- Minimal Supersymmetric Standard Model
- Minimum bounding rectangle
- Minimum mass
- Minimum orbit intersection distance
- Mining the Sky
- Minio Vallis
- Minions of the Moon
- Miniopterus bat coronavirus 1
- Miniopterus bat coronavirus HKU8
- Miniopterus fossilis
- Miniopterus macrocneme
- Minisat 01
- Ministry of Aerospace Industry
- Ministry of Earth Sciences
- Ministry of General Machine Building
- Ministry of National Defense (Turkey)
- Ministry of Science, Technology and Space
- Ministry of Sound
- Minisuperspace
- Miniverse
- Minkowski (crater)
- Minkowski space
- Minnaert (crater)
- Minnesota Geological Survey
- Minnesota Planetarium Society
- Minnie and Moo: The Night of the Living Bed
- Minoan Moulds of Palaikastro
- Minor Planet Center
- Minor planet
- Minor planet designation
- Minor-planet moon
- Minoriteam
- Minoru Kizawa
- Minotaur I
- Minotaur II
- Minotaur III
- Minotaur IV
- Mintaka
- Minus Eighty Degree Laboratory Freezer for ISS
- Minyades
- Mio Technology
- Mioara Mandea
- Miogeocline
- Mir
- Mir Core Module
- Mir Docking Module
- Mir EO-12
- Mir EO-19
- Mir EO-2
- Mir EO-21
- Mir EO-23
- Mir EO-24
- Mir EO-3
- Mir EO-4
- Mir EO-5
- Mir EO-6
- Mir EO-7
- Mir EO-8
- Mir EP-2
- Mir EP-3
- Mir Environmental Effects Payload
- Mir-2
- MirCorp
- Mira
- Mira B
- Mira Zore-Armanda
- Mira variable
- Mirabile (novel)
- Mirabilis (plant)
- Mirabilis alipes
- Mirabilis coccinea
- Mirabilis expansa
- Mirabilis jalapa
- Mirabilis laevis
- Mirabilis longiflora
- Mirabilis multiflora
- Mirabilis nyctaginea
- Miracle Mineral Supplement
- Miracle of the Sun
- Mirage World (app)
- Miraitowa and Someity
- Mirakel
- Miranda (moon)
- Miranda (satellite)
- Mirasteilas Observatory
- Mirau interferometer
- Miray Bekbölet
- Mire
- Mireia Boya Busquet
- Miriam Burland
- Miriam O'Callaghan
- Miriam Rodón Naveira
- Mirim Çelebi
- Mirko Malez
- Mirnov oscillations
- MiroSurge
- Mirror Earth
- Mirror Fusion Test Facility
- Mirror matter
- Mirror symmetry (string theory)
- Mirror symmetry conjecture
- Mirror, Mirror (Star Trek: The Original Series)
- MirrorMask
- Misaki
- Misalignment mechanism
- Mischief Night
- Mishelevka Radar Station
- Mishra Yantra
- Misner space
- Miss Baker
- Miss Kittin
- Missile Defense Alarm System
- Missile Row
- Missile combat crew
- Missile launch control center
- Missile to the Moon
- Missing Men of Saturn
- Missing Sun motif
- Missing baryon problem
- Mission Discovery
- Mission Elapsed Time
- Mission Extension Vehicle
- Mission Mangal
- Mission Mars (film)
- Mission Science Division
- Mission Shakti
- Mission Stardust
- Mission and Spacecraft Library
- Mission assurance
- Mission control center
- Mission from Mount Yoda
- Mission of Gravity
- Mission specialist
- Mission to Magnus
- Mission to Mars
- Mission to Mars (attraction)
- Mission to Mars (novel)
- Mission to Mars: My Vision for Space Exploration
- Mission to Mercury
- Mission to Mir
- Mission: Earth, Voyage to the Home Planet
- Mission: Space
- Missions (TV series)
- Mississippi Lofts and Adler Theatre
- Mississippi embayment
- Missouri Public Interest Research Group
- Missão Centenário
- Mistastin crater
- Mister Fantastic
- Mister Mind
- Mistral (crater)
- Misty C. Bentz
- Misty Montes
- Mitchel (crater)
- Mitchell (crater)
- Mitchell Brothers O'Farrell Theatre
- Mithraism
- Mithraism in comparison with other belief systems
- Mithrim Montes
- Mithuna (month)
- Mitochondrial toxicity
- Mitra (crater)
- Mitra–Varuna
- Mitrofan Nedelin
- Mitscherlich's law
- Mitsubishi Electric
- Mitsubishi Heavy Industries
- Mitteilungen der Österreichischen Geographischen Gesellschaft
- Miura 1
- Miura 5
- Mix-Roman
- Mixed anomaly
- Mixed coniferous forest
- Mixed dark matter
- Mixed grass prairie
- Mixibius
- Mixing length model
- Mixmaster universe
- Miyamoto (crater)
- Miyoshi Umeki
- Miz Ima Starr
- Mizar
- Mizar and Alcor
- Mizarai crater
- Mizuho (train)
- Mizuna
- Mjølnir crater
- Mneme (moon)
- Mnevis
- Mo'Nique
- Moanda (crater)
- Mobile Anisotropy Telescope
- Mobile Rocket Base
- Mobile Servicing System
- Mobile Suit Gundam 00 the Movie: A Wakening of the Trailblazer
- Mobile Suit Gundam: Iron-Blooded Orphans
- Mobile User Objective System
- Mobile mapping
- Mobile quarantine facility
- Mobmov
- Moccus
- Mocean Worker
- Mocha-Villarrica Fault Zone
- Mock Up on Mu
- Mockbuster
- Mockingbird Lane
- Mode water
- Model C stellarator
- Model for Prediction Across Scales
- Model photosphere
- Model spectrum
- Model year (computer modeling)
- Modelo Museum of Science and Industry
- Moderate Resolution Imaging Spectroradiometer
- Moderatus of Gades
- Modern Maximum
- Modern Motherhood
- Modern flat Earth societies
- Modes of toxic action
- Modified Dall–Kirkham telescope
- Modified Newtonian dynamics
- Modified active gas sampling
- Modra Observatory
- Modular Common Spacecraft Bus
- Modular Equipment Transporter
- Modular Ocean Model
- Modular optoelectronic multispectral scanner
- Modular rocket
- Modulational instability
- Mofolo (crater)
- Mohammad-Nabi Sarbolouki
- Mohammed bin Rashid Space Centre
- Mohammed ibn Idris al-Amrawi
- Mohawk (crater)
- Mohawk Valley Astronomical Society
- Mohawkite
- Mohorovičić (crater)
- Mohorovičić discontinuity
- Mohr Rocket
- Moigno (crater)
- Moira Jardine
- Moiré deflectometry
- Moiseev (crater)
- Moissan (crater)
- Moissanite
- Moisture
- Moisture equivalent
- Moisture recycling
- Moisture stress
- Mojave (crater)
- Mojave Aerospace Ventures
- Mojave Air and Space Port
- Molar attenuation coefficient
- Moldavite
- Moldova
- Mole people
- Molecular Hamiltonian
- Molecular beacon
- Molecular cloud
- Molecular electronic transition
- Molecular term symbol
- Molecular vibration
- Molecular-scale temperature
- Molecules in stars
- Molesworth (crater)
- Molière (crater)
- Mollisol
- Molloy Deep
- Molly Woods
- Molniya (rocket)
- Molniya (satellite)
- Molniya orbit
- Molniya-1 No.2
- Molniya-M
- Molonglo Observatory Synthesis Telescope
- Molonglo Reference Catalogue of Radio Sources
- Molten-Salt Reactor Experiment
- Moltke (crater)
- Moluccan boobook
- Moluccan masked owl
- Moluccan scops owl
- Molėtai Astronomical Observatory
- Mom and Dad Save the World
- Moment distance index
- Moment of inertia factor
- Moment space surveillance complex
- Momentum compaction
- Momentum exchange tether
- Momentum transfer
- Momma Named Me Sheriff
- Mommur Chasma
- Mona Lisa (crater)
- Monad (philosophy)
- Monas Hieroglyphica
- Monatomic gas
- Mondamin (crater)
- Mondas
- Mondo Cane
- Mondo Cannibale
- Mondo Hollywood
- Mondo Keyhole
- Mondo New York
- Mondo Topless
- Mondo film
- Monet (crater)
- Money (Pink Floyd song)
- Monfragüe
- Monge (crater)
- Mongo (fictional planet)
- Mongo Wrestling Alliance
- Mongol mythology
- Mongol-Okhotsk Ocean
- Mongolia
- Mongolian cosmogony
- Mongolian gerbil
- Mongoose-V
- Monica (rocket)
- Monica Boyar
- Monica Grady
- Monihar
- Monika (1974 film)
- Monika Puskeppeleit
- Monin–Obukhov length
- Monitor-E
- Monk (crater)
- Monkey (zodiac)
- Monkeys and apes in space
- Monoceros
- Monoceros Ring
- Monoceros in Chinese astronomy
- Monocerotids
- Monocerotis
- Monochord
- Monochromatic electromagnetic plane wave
- Monochromatic wavelength dispersive x-ray fluorescence
- Monochromator
- Monocropping
- Monocular
- Monolith
- Monolith (Space Odyssey)
- Monomoiria
- Monopoly Star Wars
- Monopropellant
- Monothalamea
- Mons (planetary nomenclature)
- Mons Agnes
- Mons Ardeshir
- Mons Argaeus
- Mons Bradley
- Mons Delisle
- Mons Dieter
- Mons Dilip
- Mons Esam
- Mons Gruithuisen Gamma
- Mons Hadley
- Mons Hadley Delta
- Mons Hansteen
- Mons Herodotus
- Mons Huygens
- Mons La Hire
- Mons Maenalus
- Mons Maraldi
- Mons Moro
- Mons Penck
- Mons Pico
- Mons Piton
- Mons Rümker
- Mons Usov
- Mons Vinogradov
- Mons Vitruvius
- Monsanto House of the Future
- Monserrate Román
- Monsoon of South Asia
- Monster Bash
- Monster Cereals
- Monster High: Fright On!
- Monster House (film)
- Monster Madhouse Live
- Monster Mash
- Monster in the Closet
- MonsterVision
- Monsters in Orbit
- Monsters of Men
- Monsters vs. Aliens: Mutant Pumpkins from Outer Space
- Monsters, Inc. Ride & Go Seek
- Monstrous Regiment (novel)
- Mont Blanc (Moon)
- Mont Mégantic Observatory
- Montage (image software)
- Montagnais crater
- Montague Arms
- Montana Jones
- Montana flume
- Montana meridian
- Montanari (crater)
- Montane grasslands and shrublands
- Monte Agliale Supernovae and Asteroid Survey
- Monte Generoso Observatory
- Monte Mario Observatory
- Monte Milone (meteorite)
- Monterey Accelerated Research System
- Montes Agricola
- Montes Alpes
- Montes Apenninus
- Montes Archimedes
- Montes Carpatus
- Montes Caucasus
- Montes Cordillera
- Montes Haemus
- Montes Harbinger
- Montes Jura
- Montes Pyrenaeus
- Montes Recti
- Montes Riphaeus
- Montes Rook
- Montes Secchi
- Montes Spitzbergen
- Montes Taurus
- Montes Teneriffe
- Montevallo (crater)
- Monteverdi (crater)
- Montezuma Hot Springs
- Montgolfier (crater)
- Month
- Monthly Notices of the Royal Astronomical Society
- Monthly Weather Review
- Montreal Planetarium
- Montreal Science Centre
- Montreal Student Space Associations
- Montrealer (train)
- Montreal–Gaspé train
- Monts de Gueret Animal Park
- Monument to the Conquerors of Space
- Monuments of Mars
- Mood II Swing
- Mood ring
- Moodabe family
- Moody (crater)
- Moodymann
- Moog (code)
- Moogega Cooper
- Moomins and the Comet Chase
- Moon
- Moon (Björk song)
- Moon (film)
- Moon (video game)
- Moon 44
- Moon Base One
- Moon Boots (music producer)
- Moon Diver (spacecraft)
- Moon Express
- Moon Impact Probe
- Moon Machines
- Moon Maid (comics)
- Moon Maiden (character)
- Moon Man (novel)
- Moon McDare
- Moon Museum
- Moon Patrol
- Moon Pilot
- Moon Ranger
- Moon Shot
- Moon Society
- Moon Temple (Chía)
- Moon Treaty
- Moon Tycoon
- Moon Zero Two
- Moon for Sale
- Moon illusion
- Moon in fiction
- Moon landing
- Moon landing conspiracy theories
- Moon landing conspiracy theories in popular culture
- Moon landings in fiction
- Moon magic
- Moon of Mutiny
- Moon rabbit
- Moon rock
- Moon tree
- Moon: Remix RPG Adventure
- MoonBase Commander
- MoonBaseOne
- MoonLIGHT
- MoonLITE
- MoonRise
- Moona Lisa
- Moonage Daydream
- Moonbase
- Moonbase (video game)
- Moonbase 3
- Moonbase 8
- Moonbase Alpha (video game)
- Moonbow
- Mooncake
- Mooncalf
- Moondial
- Moonfall (McDevitt novel)
- Moonflight (song)
- Moongate (book)
- Moongirl
- Mooning
- Moonlet
- Moonlight
- Moonlight Echigo
- Moonlight Nagara
- Moonlight Shinshū
- Moonlight cactus
- Moonlight tower
- Moonlight towers (Austin, Texas)
- Moonraker (film)
- Moons of Haumea
- Moons of Jupiter
- Moons of Mars
- Moons of Neptune
- Moons of Pluto
- Moons of Saturn
- Moons of Uranus
- Moonscape
- Moonseed (novel)
- Moonshine County Express
- Moonshot (film)
- Moonshot: The Flight Of Apollo 11
- Moonstone (The Outer Limits)
- Moontrap
- Moonwalk One
- Moonwalkers (film)
- Moonwind
- Moore (lunar crater)
- Moore Center for Theoretical Cosmology and Physics
- Moorella (bacterium)
- Moorella glycerini
- Moorella humiferrea
- Moorella mulderi
- Moorella perchloratireducens
- Moorella stamsii
- Moorella thermoacetica
- Moorella thermoautotrophica
- Mooring (oceanography)
- Moorland
- Mopra Telescope
- Mor humus
- Moraine
- Moraine-dammed lake
- Moral Orel
- Morana (goddess)
- Morasko Meteorite Nature Reserve
- Mordecai Comtino
- Mordechai Finzi
- Mordehai Milgrom
- Mordor Macula
- More Than Earthlings
- More Tribbles, More Troubles
- More veneto
- Morehead Planetarium and Science Center
- Morelos Satellite System
- Moreta: Dragonlady of Pern
- Moreton wave
- Moretus (crater)
- Moreux (crater)
- Morgan Page
- Morgan Watson
- Morgan le Fay
- Morgan–Monroe Observatory
- Morgoth Macula
- Morgus the Magnificent
- Moriba Jah
- Moritz Allé
- Moritz Bergstein Shoddy Mill and Warehouse
- Moritz Ludwig George Wichmann
- Moritz Löw
- Morley (crater)
- Mormoopidae
- Mormoops
- Morning
- Morning Gloryville
- Morning Star (Brown novel)
- Morning Star (train)
- Morning, Noon and Night (film)
- Morningness–eveningness questionnaire
- Morningtown Ride
- Morojo
- Morokweng crater
- Morons from Outer Space
- Morozov (crater)
- Morpeth Arms
- Morpheus
- Morphoclimatic zones
- Morphological Catalogue of Galaxies
- Morphs collaboration
- Morris K. Jessup
- Morris Observatory
- Morris Scott Dollens
- Morrison Observatory
- Morro Solar Group
- Morse (crater)
- Morse Message (1962)
- Mort
- Morvan's syndrome
- Morón Fault System
- Moscow Cinema
- Moscow-Cassiopeia
- Moseley (crater)
- Moses Botarel Farissol
- Moshe Carmeli
- Moss meteorite
- Moss-Man
- Most Ancient European Towns Network
- Most northerly point of land
- Mostafa Kamal Tolba
- Mostafa Roustaei
- Mostly 4 Millennials
- Mostly Ghostly: Have You Met My Ghoulfriend?
- Mostly Ghostly: Who Let the Ghosts Out?
- Mother (Pink Floyd song)
- Mother Brain
- Mother Camels
- Mother Juan Aviance
- Mother ship
- Mother-in-Law Lounge
- Mothstorm
- Motion Potion
- Motional narrowing
- Moto Blanco
- Motorcycle Gang (1957 film)
- Motorcycle Gang (1994 film)
- Motorhead (song)
- Motorpsycho (film)
- Motorway City
- Mouchez (crater)
- Moulin (geomorphology)
- Moulin Rouge
- Moulton (crater)
- Moumita Dutta
- Mound 72
- Mound system
- Mounds Observatory
- Mount Abu InfraRed Observatory
- Mount Aka (Yatsugatake)
- Mount Albert Grammar School
- Mount Burnett Observatory
- Mount Carleton Provincial Park
- Mount Cook Village
- Mount Cuba Astronomical Observatory
- Mount Diablo meridian
- Mount Elbrus
- Mount Erebus
- Mount Everest
- Mount Iō (Iōjima)
- Mount John University Observatory
- Mount Kent Observatory
- Mount Killaraus
- Mount Laguna Observatory
- Mount Lemmon Survey
- Mount Marilyn
- Mount Oread
- Mount Pleasant Radio Observatory
- Mount Sefton
- Mount Sharp
- Mount Simon Sandstone
- Mount Suhora Observatory
- Mount Thor
- Mount Toondina crater
- Mountain Skies Observatory
- Mountain chain
- Mountain formation
- Mountain river
- Mountain scops owl
- Mountains of Io
- Mountains of Kong
- Mouse ear swelling test
- Mouse into Space
- Mouse unit
- Mousse T.
- Moutere Inn
- Mouth bar
- Mouth to Mouth (2005 British film)
- Move (software)
- Movie Battles
- Movie palace
- Movie theater
- Moving Mars
- Moving Pictures (novel)
- Moving Violation (film)
- Moving frame
- Moving the Earth
- Moving to Mars (song)
- Moving-cluster method
- Mowing-Devil
- Mozambique tilapia
- Mozart (crater)
- Mozhayets-5
- Mr. Bass's Planetoid
- Mr. C
- Mr. Know It Owl
- Mr. Lobo
- Mr. Merlin
- Mr. No Legs
- Mr. Nobody (film)
- Mr. Pickles
- Mr. Ricco
- Mr. Sam
- Mr. Sandman
- Mr. Skygack, from Mars
- Mr. Spaceman
- Mr. Squiggle
- Mr. Stranger's Sealed Packet
- Mrdini
- Mri (fictional alien species)
- Mrigashīrsha
- Mrinal Kumar Das Gupta
- Mrs Wood
- Ms .45
- Ms. Stiletto
- Ms. Tree (ship)
- Mstislav Keldysh
- Mstrkrft
- Mu Andromedae
- Mu Aquarii
- Mu Aquilae
- Mu Arae
- Mu Arae b
- Mu Arae c
- Mu Arae d
- Mu Arae e
- Mu Arietis
- Mu Aurigae
- Mu Boötis
- Mu Cancri
- Mu Canis Majoris
- Mu Capricorni
- Mu Cassiopeiae
- Mu Centauri
- Mu Cephei
- Mu Ceti
- Mu Chamaeleontis
- Mu Columbae
- Mu Coronae Australis
- Mu Coronae Borealis
- Mu Crucis
- Mu Cygni
- Mu Draconis
- Mu Eridani
- Mu Fornacis
- Mu Geminorum
- Mu Gruis
- Mu Herculis
- Mu Horologii
- Mu Hydrae
- Mu Leonis
- Mu Leporis
- Mu Librae
- Mu Lupi
- Mu Lyrae
- Mu Mensae
- Mu Muscae
- Mu Normae
- Mu Octantis
- Mu Ophiuchi
- Mu Orionis
- Mu Pegasi
- Mu Persei
- Mu Phoenicis
- Mu Pictoris
- Mu Piscis Austrini
- Mu Piscium
- Mu Sagittarii
- Mu Scorpii
- Mu Sculptoris
- Mu Serpentis
- Mu Space
- Mu Tauri
- Mu Telescopii
- Mu Ursae Majoris
- Mu Velorum
- Mu Virginis
- Mu problem
- Mu'ayyad al-Din al-Urdi
- Mu1 Cancri
- Mu1 Chamaeleontis
- Mu1 Gruis
- Mu1 Scorpii
- Mu2 Cancri
- Mu2 Chamaeleontis
- Mu2 Gruis
- Mu2 Octantis
- Mu2 Scorpii
- MuSIASEM
- Muchea Tracking Station
- Mud
- Mud cracks on Mars
- Mud volcano
- Mudboil
- Mudd's Passion
- Mudd's Women
- Muddy Creek (central Utah)
- Mudflat
- Mueller Glacier
- Mueller calculus
- Mug Ruith
- Mugar Omni Theater
- Mugham
- Muhammad Bux Johar
- Muhammad Hafeez Qureshi
- Muhammad Ibn Muhammad Al-Fulani Al-Kishwani
- Muhammad Rafique (mathematician)
- Muhammad Saleh Thattvi
- Muhammad Sharif (cosmologist)
- Muhammad al-Rudani
- Muhammad ibn Abi Bakr al‐Farisi
- Muhammad ibn Musa al-Khwarizmi
- Muhammad ibn al-Qasim al-Badisi
- Muhammed Faris
- Muhurta
- Muhyi al-Dīn al-Maghribī
- Muisca astronomy
- Muisca calendar
- Mujibur and Sirajul
- Mukachevo Radar Station
- Mukhtar Aymakhanov
- Mula (nakshatra)
- Mulla Mahmud Jaunpuri
- Mullard Radio Astronomy Observatory
- Mullard Space Science Laboratory
- Mulled wine
- Mulling (spectroscopy)
- Multan Sun Temple
- Multi mode interferometer
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- Multi-Band Excitation
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- Murakami (crater)
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- Murder Collection V.1
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- Murexide
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- Music in space
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- Musica universalis
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- N-I (rocket)
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- N-STAR c
- N-body choreography
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- N-body units
- N-philes
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- N-slit interferometric equation
- N-vector
- N. H. Baker
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- N1 (rocket)
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- N=2 superstring
- NAME (dispersion model)
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- NEMO (Stellar Dynamics Toolbox)
- NEODyS
- NEOSTEL
- NERVA
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- NEVOD
- NEXTAR
- NEXTSat
- NGC 1
- NGC 10
- NGC 100
- NGC 1000
- NGC 1003
- NGC 101
- NGC 1015
- NGC 1019
- NGC 102
- NGC 1022
- NGC 1023
- NGC 1023 Group
- NGC 1027
- NGC 103
- NGC 1032
- NGC 1042
- NGC 1049
- NGC 105
- NGC 1052
- NGC 1052-DF2
- NGC 1055
- NGC 1058
- NGC 106
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- NGC 4561
- NGC 4564
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- NGC 4567 and NGC 4568
- NGC 457
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- NGC 4571
- NGC 4578
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- NGC 4630
- NGC 4631
- NGC 4631 Group
- NGC 4633
- NGC 4634
- NGC 4636
- NGC 4638
- NGC 4639
- NGC 464
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- NGC 465
- NGC 4650A
- NGC 4651
- NGC 4654
- NGC 4656 and NGC 4657
- NGC 4658
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- NGC 4660
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- NGC 4790
- NGC 48
- NGC 480
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- NGC 4861
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- NGC 4871
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- NGC 4874
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- NGC 4876
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- NGC 4881
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- NGC 49
- NGC 490
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- NGC 4907
- NGC 491
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- NGC 4918
- NGC 4919
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- NGC 495
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- NGC 4984
- NGC 499
- NGC 4993
- NGC 50
- NGC 500
- NGC 5000
- NGC 5001
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- NGC 5005
- NGC 501
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- NGC 5011
- NGC 5018
- NGC 502
- NGC 5023
- NGC 5026
- NGC 503
- NGC 5030
- NGC 5033
- NGC 5034
- NGC 504
- NGC 505
- NGC 5050
- NGC 5053
- NGC 506
- NGC 5068
- NGC 507
- NGC 5078
- NGC 508
- NGC 5084
- NGC 5087
- NGC 509
- NGC 5090 and NGC 5091
- NGC 51
- NGC 510
- NGC 5101
- NGC 5102
- NGC 511
- NGC 5112
- NGC 5114
- NGC 512
- NGC 513
- NGC 514
- NGC 5144
- NGC 515
- NGC 516
- NGC 5161
- NGC 5164
- NGC 517
- NGC 5170
- NGC 5177
- NGC 518
- NGC 5189
- NGC 519
- NGC 5195
- NGC 52
- NGC 520
- NGC 5201
- NGC 5204
- NGC 521
- NGC 522
- NGC 5223
- NGC 5229
- NGC 523
- NGC 5238
- NGC 524
- NGC 5247
- NGC 5248
- NGC 525
- NGC 5253
- NGC 5256
- NGC 526
- NGC 5264
- NGC 527
- NGC 528
- NGC 5281
- NGC 5286
- NGC 5291
- NGC 53
- NGC 530
- NGC 5300
- NGC 5307
- NGC 5308
- NGC 531
- NGC 5315
- NGC 5316
- NGC 532
- NGC 5322
- NGC 533
- NGC 5331
- NGC 5334
- NGC 534
- NGC 5343
- NGC 535
- NGC 536
- NGC 5363
- NGC 5364
- NGC 5371
- NGC 538
- NGC 539
- NGC 5395
- NGC 5398
- NGC 54
- NGC 540
- NGC 5408
- NGC 541
- NGC 542
- NGC 543
- NGC 545
- NGC 546
- NGC 5460
- NGC 5466
- NGC 5468
- NGC 547
- NGC 5470
- NGC 5474
- NGC 5477
- NGC 548
- NGC 5490
- NGC 55
- NGC 550
- NGC 5529
- NGC 5544
- NGC 5545
- NGC 5548
- NGC 5559
- NGC 5562
- NGC 5566
- NGC 5575
- NGC 5579
- NGC 5584
- NGC 5585
- NGC 559
- NGC 560
- NGC 5609
- NGC 5613
- NGC 5614
- NGC 5615
- NGC 5617
- NGC 5619
- NGC 5624
- NGC 5634
- NGC 5640
- NGC 5643
- NGC 5653
- NGC 5662
- NGC 5665
- NGC 5668
- NGC 5676
- NGC 5678
- NGC 5679 Group
- NGC 5682
- NGC 5694
- NGC 57
- NGC 570
- NGC 5705
- NGC 5713
- NGC 5714
- NGC 5728
- NGC 5746
- NGC 5749
- NGC 5750
- NGC 5752
- NGC 5753
- NGC 5754
- NGC 5755
- NGC 5765
- NGC 5774
- NGC 5775
- NGC 5792
- NGC 5793
- NGC 5806
- NGC 5820
- NGC 5821
- NGC 5822
- NGC 5823
- NGC 5824
- NGC 5829
- NGC 5837
- NGC 5838
- NGC 584
- NGC 5846
- NGC 585
- NGC 5861
- NGC 5866
- NGC 5866 Group
- NGC 5879
- NGC 588
- NGC 5882
- NGC 5886
- NGC 5890
- NGC 5897
- NGC 59
- NGC 5907
- NGC 5917
- NGC 592
- NGC 5921
- NGC 5925
- NGC 5927
- NGC 5929
- NGC 5930
- NGC 5949
- NGC 595
- NGC 596
- NGC 5962
- NGC 5964
- NGC 5965
- NGC 5966
- NGC 5970
- NGC 5979
- NGC 5982
- NGC 5985
- NGC 5986
- NGC 5999
- NGC 60
- NGC 600
- NGC 6000
- NGC 6002
- NGC 6005
- NGC 602
- NGC 6025
- NGC 6027
- NGC 6027a
- NGC 6027b
- NGC 6027c
- NGC 6027d
- NGC 6027e
- NGC 6028
- NGC 6031
- NGC 6039
- NGC 604
- NGC 6040
- NGC 6041
- NGC 6043
- NGC 6044
- NGC 6045
- NGC 6047
- NGC 605
- NGC 6052
- NGC 6053
- NGC 6054
- NGC 6055
- NGC 6056
- NGC 606
- NGC 6061
- NGC 6067
- NGC 6072
- NGC 608
- NGC 6085
- NGC 6086
- NGC 6087
- NGC 6090
- NGC 61
- NGC 6101
- NGC 6104
- NGC 6115
- NGC 6118
- NGC 612
- NGC 6120
- NGC 6124
- NGC 613
- NGC 6134
- NGC 6139
- NGC 6144
- NGC 615
- NGC 6152
- NGC 6153
- NGC 6158
- NGC 6166
- NGC 6167
- NGC 6169
- NGC 6181
- NGC 6188
- NGC 6193
- NGC 62
- NGC 620
- NGC 6200
- NGC 6204
- NGC 6207
- NGC 6208
- NGC 6210
- NGC 6212
- NGC 6215
- NGC 6217
- NGC 622
- NGC 6221
- NGC 6229
- NGC 623
- NGC 6231
- NGC 6239
- NGC 624
- NGC 6240
- NGC 6242
- NGC 6248
- NGC 625
- NGC 6250
- NGC 6251
- NGC 6256
- NGC 6263
- NGC 6281
- NGC 6284
- NGC 6285
- NGC 6286
- NGC 6287
- NGC 6293
- NGC 63
- NGC 630
- NGC 6300
- NGC 6302
- NGC 6304
- NGC 6309
- NGC 6316
- NGC 6325
- NGC 6326
- NGC 6328
- NGC 6334
- NGC 634
- NGC 6340
- NGC 6342
- NGC 635
- NGC 6352
- NGC 6355
- NGC 6356
- NGC 6357
- NGC 636
- NGC 6362
- NGC 6366
- NGC 637
- NGC 6373
- NGC 6375
- NGC 6380
- NGC 6384
- NGC 6388
- NGC 6394
- NGC 6397
- NGC 64
- NGC 6400
- NGC 6401
- NGC 6412
- NGC 6426
- NGC 643
- NGC 644
- NGC 6440
- NGC 6441
- NGC 6445
- NGC 645
- NGC 6452
- NGC 6453
- NGC 6480
- NGC 6496
- NGC 65
- NGC 6503
- NGC 6509
- NGC 6520
- NGC 6522
- NGC 6528
- NGC 6530
- NGC 6535
- NGC 6539
- NGC 654
- NGC 6540
- NGC 6541
- NGC 6544
- NGC 655
- NGC 6553
- NGC 6558
- NGC 6559
- NGC 656
- NGC 6560
- NGC 6565
- NGC 6566
- NGC 6569
- NGC 657
- NGC 6570
- NGC 6572
- NGC 6578
- NGC 6584
- NGC 6589
- NGC 659
- NGC 6590
- NGC 66
- NGC 660
- NGC 6603
- NGC 6604
- NGC 6621
- NGC 6624
- NGC 663
- NGC 6633
- NGC 6638
- NGC 6642
- NGC 6670
- NGC 668
- NGC 669
- NGC 67
- NGC 670
- NGC 6709
- NGC 6712
- NGC 6717
- NGC 672
- NGC 6723
- NGC 6729
- NGC 6738
- NGC 6741
- NGC 6744
- NGC 6745
- NGC 6751
- NGC 6752
- NGC 6753
- NGC 6755
- NGC 6756
- NGC 676
- NGC 6760
- NGC 6778
- NGC 6781
- NGC 6782
- NGC 6786
- NGC 6789
- NGC 679
- NGC 6790
- NGC 6791
- NGC 68
- NGC 68 group
- NGC 680
- NGC 6801
- NGC 681
- NGC 6810
- NGC 6811
- NGC 6814
- NGC 6818
- NGC 6819
- NGC 6820 and NGC 6823
- NGC 6822
- NGC 6826
- NGC 6834
- NGC 684
- NGC 6845
- NGC 6850
- NGC 6861
- NGC 6863
- NGC 6866
- NGC 687
- NGC 6871
- NGC 6872
- NGC 688
- NGC 6881
- NGC 6884
- NGC 6885
- NGC 6886
- NGC 69
- NGC 690
- NGC 6902
- NGC 6905
- NGC 6907
- NGC 691
- NGC 6910
- NGC 6914
- NGC 6925
- NGC 6934
- NGC 6939
- NGC 694
- NGC 6940
- NGC 6946
- NGC 695
- NGC 6951
- NGC 6975
- NGC 6984
- NGC 7
- NGC 70
- NGC 700
- NGC 7001
- NGC 7002
- NGC 7003
- NGC 7004
- NGC 7006
- NGC 7007
- NGC 7008
- NGC 701
- NGC 7010
- NGC 7012
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- NGC 7015
- NGC 7016
- NGC 7019
- NGC 7020
- NGC 7022
- NGC 7025
- NGC 7026
- NGC 7027
- NGC 7028
- NGC 7029
- NGC 703
- NGC 7030
- NGC 7032
- NGC 7033
- NGC 7034
- NGC 7035 and NGC 7035A
- NGC 7038
- NGC 704
- NGC 7040
- NGC 7041
- NGC 7041B
- NGC 7042
- NGC 7043
- NGC 7046
- NGC 7047
- NGC 7048
- NGC 7049
- NGC 705
- NGC 7051
- NGC 7052
- NGC 7053
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- NGC 7059
- NGC 706
- NGC 7060
- NGC 7061
- NGC 7064
- NGC 7065
- NGC 7066
- NGC 7068
- NGC 7069
- NGC 7070
- NGC 7070A
- NGC 7072
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- NGC 7075
- NGC 7077
- NGC 7079
- NGC 708
- NGC 7080
- NGC 7081
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- NGC 7085
- NGC 7087
- NGC 709
- NGC 7090
- NGC 7095
- NGC 7096
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- NGC 71
- NGC 710
- NGC 712
- NGC 7129
- NGC 713
- NGC 7130
- NGC 7139
- NGC 714
- NGC 7142
- NGC 7160
- NGC 717
- NGC 7184
- NGC 7190
- NGC 7191
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- NGC 7199
- NGC 72
- NGC 720
- NGC 7209
- NGC 721
- NGC 7213
- NGC 7217
- NGC 7243
- NGC 725
- NGC 7250
- NGC 7252
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- NGC 7259
- NGC 73
- NGC 7301
- NGC 7302
- NGC 7303
- NGC 7314
- NGC 7315
- NGC 7317
- NGC 7318
- NGC 7319
- NGC 732
- NGC 7320
- NGC 7320c
- NGC 7331
- NGC 7331 Group
- NGC 7332
- NGC 734
- NGC 7354
- NGC 736
- NGC 7380
- NGC 739
- NGC 74
- NGC 740
- NGC 741
- NGC 7418
- NGC 7419
- NGC 7424
- NGC 7429
- NGC 7448
- NGC 7459
- NGC 7469
- NGC 7479
- NGC 7499
- NGC 75
- NGC 750
- NGC 751
- NGC 7510
- NGC 7513
- NGC 752
- NGC 7522
- NGC 753
- NGC 7531
- NGC 7537
- NGC 7538
- NGC 755
- NGC 7552
- NGC 7582
- NGC 7585
- NGC 759
- NGC 7592
- NGC 76
- NGC 7600
- NGC 7603
- NGC 7606
- NGC 7610
- NGC 7619
- NGC 7635
- NGC 7640
- NGC 765
- NGC 766
- NGC 7662
- NGC 767
- NGC 7673
- NGC 7674
- NGC 7679
- NGC 768
- NGC 7686
- NGC 769
- NGC 77
- NGC 770
- NGC 7714
- NGC 772
- NGC 7723
- NGC 7727
- NGC 7741
- NGC 7742
- NGC 7752 and NGC 7753
- NGC 7759
- NGC 777
- NGC 7772
- NGC 7773
- NGC 7777
- NGC 7789
- NGC 779
- NGC 7790
- NGC 7793
- NGC 78
- NGC 781
- NGC 7812
- NGC 7814
- NGC 7816
- NGC 782
- NGC 7822
- NGC 7835
- NGC 7836
- NGC 7837
- NGC 7838
- NGC 784
- NGC 7840
- NGC 79
- NGC 790
- NGC 8
- NGC 80
- NGC 800
- NGC 801
- NGC 802
- NGC 803
- NGC 804
- NGC 805
- NGC 806
- NGC 81
- NGC 810
- NGC 811
- NGC 812
- NGC 813
- NGC 814
- NGC 817
- NGC 819
- NGC 82
- NGC 820
- NGC 821
- NGC 822
- NGC 823
- NGC 824
- NGC 825
- NGC 83
- NGC 830
- NGC 834
- NGC 838
- NGC 84
- NGC 840
- NGC 85
- NGC 850
- NGC 852
- NGC 86
- NGC 860
- NGC 861
- NGC 862
- NGC 869
- NGC 87
- NGC 874
- NGC 877
- NGC 88
- NGC 880
- NGC 884
- NGC 89
- NGC 890
- NGC 891
- NGC 9
- NGC 90
- NGC 900
- NGC 901
- NGC 902
- NGC 903
- NGC 904
- NGC 905
- NGC 906
- NGC 908
- NGC 91
- NGC 910
- NGC 911
- NGC 912
- NGC 913
- NGC 918
- NGC 92
- NGC 920
- NGC 922
- NGC 925
- NGC 93
- NGC 931
- NGC 935 and IC 1801
- NGC 936
- NGC 937
- NGC 938
- NGC 939
- NGC 94
- NGC 940
- NGC 941
- NGC 95
- NGC 950
- NGC 953
- NGC 956
- NGC 957
- NGC 96
- NGC 960
- NGC 965
- NGC 966
- NGC 97
- NGC 970
- NGC 972
- NGC 973
- NGC 98
- NGC 980
- NGC 985
- NGC 986
- NGC 988
- NGC 99
- NGC 990
- NGC 991
- NGC 992
- NGC 995
- NGC 996
- NGC 997
- NGC 998
- NGC 999
- NGL Prime
- NGTS-1b
- NGTS-3Ab
- NICMOSlook
- NIMBY
- NIOBE
- NIROSETI
- NIRSpec
- NISAR (satellite)
- NIXT
- NMEA 0183
- NMEA 2000
- NML Cygni
- NN Serpentis
- NNG (company)
- NO Apodis
- NO Aurigae
- NOAA Center for Tsunami Research
- NOAA Central Library
- NOAA Commissioned Officer Corps
- NOAA Diving Manual
- NOAA Hurricane Hunters
- NOAA National Operational Model Archive and Distribution System (NOMADS)
- NOAA ships and aircraft
- NOAA-1
- NOAA-10
- NOAA-11
- NOAA-12
- NOAA-13
- NOAA-14
- NOAA-15
- NOAA-16
- NOAA-17
- NOAA-18
- NOAA-19
- NOAA-2
- NOAA-20
- NOAA-3
- NOAA-4
- NOAA-5
- NOAA-6
- NOAA-7
- NOAA-8
- NOAA-9
- NOAA-B
- NOBM
- NOIRLab
- NORSAR
- NOTS-EV-1 Pilot
- NOTS-EV-2 Caleb
- NOvA
- NOÉ21
- NPO Mashinostroyeniya
- NPO Molniya
- NPP Zvezda
- NPZ model
- NQ Vulpeculae
- NR Canis Majoris
- NR Vulpeculae
- NRAO VLA Sky Survey
- NRLMSISE-00
- NS Puppis
- NS5-brane
- NSS-5
- NSS-6
- NSS-7
- NSS-703
- NSS-8
- NSS-806
- NSS-9
- NSSC-1
- NSV 1436
- NSVS 14256825
- NTSF:SD:SUV::
- NU Pavonis
- NUTS 1 (satellite)
- NV Puppis
- NV1
- NVSS 2146+82
- NW Puppis
- NY Virginis
- NY Virginis b
- Na'vi River Journey
- Na'vi grammar
- Na'vi language
- Nabalia
- Nabokov (crater)
- Nabta Playa
- Nabu
- Nachi-Katsuura Observatory
- Nacho Vigalondo
- Nadezhda (cockroach)
- Nadezhda Aleksandrovna Bobrinskaya
- Nadezhda Kuzhelnaya
- Nadi astrology
- Nadia Lapusta
- Nadia Pinardi
- Nadia Zakamska
- Nadieh Bremer
- Nadine G. Barlow
- Nadir
- Nadir (topography)
- Nadir Ibrahimov
- Nadir and Occultation for Mars Discovery
- Naegleria fowleri
- Nag Nag Nag
- Nag's Head, Covent Garden
- Naga-L
- Nagannathaswamy Temple, Keezhaperumpallam
- Nagaoka (crater)
- Nagoya City Science Museum
- Naha (train)
- Nahid-1
- Nahuel 1A
- Nahum (artist)
- Nahundi
- Naiad (moon)
- Nail in the Coffin
- Nain Province
- Naious
- Nairi Cinema
- Naj Tunich
- Najm al-Din al-Qazwini al-Katibi
- Najm al‐Din al‐Misri
- Naked Angels
- Naked News
- Naked eye
- Naked singularity
- Nakhla meteorite
- Nakhlite
- Nakshatra
- Nakshatravana
- Nakshi kantha
- Naktong Vallis
- Nakuru Lacuna
- Nalo Hopkinson
- Nam Chang-hee
- Nam's Angels
- Namaka (moon)
- Namatjira (crater)
- Nambi (mythology)
- Nambu–Goto action
- Namco Classic Collection Vol. 1
- Name conflicts with minor planets
- NameExoWorlds
- Names of the days of the week
- Namib
- NamibRand Nature Reserve
- Naming of comets
- Naming of moons
- Nammo
- Nampeyo (crater)
- Nan Dieter-Conklin
- Nan Rendong
- Nana (1985 film)
- Nanahuatzin
- Nanarchy
- Nancy Bell (author)
- Nancy Bertler
- Nancy Chabot
- Nancy Collins Johnson
- Nancy Grace Roman Space Telescope
- Nancy J. Currie-Gregg
- Nancy Kress
- Nancy Roman
- Nanda Rea
- Nandigrama
- Nando's Coffee House
- Nanedi Valles
- Nanichi
- Nankivell Observatory
- Nanny Ogg's Cookbook
- Nano electrokinetic thruster
- Nano-FTIR
- Nano-JASMINE
- Nano-PSI
- Nano-particle field extraction thruster
- NanoAvionics
- NanoSail-D
- NanoSail-D2
- NanoSat MO Framework
- Nanoarchaeum equitans
- Nanoflares
- Nanofluids in solar collectors
- Nanogeoscience
- Nanohaloarchaea
- Nanoracks
- Nanoracks Bishop Airlock
- Nanoracks CubeSat Deployer
- Nanos Fireworks
- Nanosat 01
- Nanosat-1B
- Nanosatellite Launch System
- Nanotek
- Nanotoxicology
- Nansen (Martian crater)
- Nansen (lunar crater)
- Nansen-Apollo (crater)
- Nantan meteorite
- Nançay Radio Observatory
- Naoko Yamazaki
- Naomi McClure-Griffiths
- Naomi Oreskes
- Naonobu (crater)
- Naoto Satō
- Naoyuki Kato
- Nap
- Nap pods
- Napa-1
- Naphthalene poisoning
- Naphtholphthalein
- Napir
- Naples underground geothermal zone
- Nappe (water)
- Napping Princess
- Nar as-samum
- Narabedla Ltd.
- Narcobarbital
- Narcolepsy
- Narcolepsy Network
- Narcosynthesis
- Naro Space Center
- Narrabeen group
- Narrabri Stellar Intensity Interferometer
- Narragansett (soil)
- Narratio Prima
- Naruto Uzumaki
- Narvi (moon)
- Nasadiya Sukta
- Nasal EPAP
- Nasamike
- Nashville Girl
- Nasir al-Din al-Tusi
- Nasireddin (crater)
- Nasmyth (crater)
- Nasmyth telescope
- Nasreddin (crater)
- Nassau (crater)
- Nastulus
- Nat Taylor
- Natal Observatory
- Natal astrology
- Natal long-fingered bat
- Natalidae
- Natalie Batalha
- Natalie Robinson
- Natalie Roe
- Natchez silt loam
- Nathair Facula
- Nathalie Cabrol
- Nathan Fillion
- Nathan Juran
- Nathanael Matthaeus von Wolf
- Nathaniel Bowditch
- Nathaniel J. Fisch
- Nathaniel Kleitman
- Nathaniel Portlock
- Nation (nightclub)
- National Advisory Committee for Aeronautics
- National Aerospace Development Administration
- National Aerospace Laboratory of Japan
- National Air and Space Museum
- National Ambient Air Quality Standards
- National Archaeological Museum, Naples
- National Association of Geoscience Teachers
- National Astronaut Day
- National Astronomical Observatory (Chile)
- National Astronomical Observatory (Mexico)
- National Astronomical Observatory of China
- National Astronomical Observatory of Japan
- National Astronomical Research Institute of Thailand
- National Astronomy Meeting
- National Astronomy Week
- National Astrophysics and Space Science Programme
- National Atmospheric Deposition Program
- National Atmospheric Release Advisory Center
- National Atmospheric Research Laboratory
- National Australian Convention of Amateur Astronomers
- National Authority for Remote Sensing and Space Sciences
- National Balloon Facility
- National Center for Atmospheric Research
- National Center for Computational Sciences
- National Center for Earth-surface Dynamics
- National Centers for Environmental Information
- National Centre for Atmospheric Science
- National Centre for Earth Observation
- National Centre for Earth Science Studies
- National Centre for Medium Range Weather Forecasting
- National Centre for Polar and Ocean Research
- National Centre for Radio Astrophysics
- National Centre of Scientific Research "Demokritos"
- National Children's Study
- National Chung-Shan Institute of Science and Technology
- National Climate Change Secretariat
- National Climatic Data Center
- National Commission for Aerospace Research and Development
- National Commission for the Observance of World Population Year 1974
- National Commission on Population
- National Committee for Space Research
- National Compact Stellarator Experiment
- National Cooperative Soil Survey
- National Council for Geocosmic Research
- National Dark-Sky Week
- National Defence Complex
- National Defense University (Republic of China)
- National Elevation Dataset
- National Emblem of Bangladesh
- National Emblem of the People's Republic of China
- National Emissions Standards Act
- National Energy Research Scientific Computing Center
- National Environmental Research Institute of Denmark
- National Environmental Satellite, Data, and Information Service
- National Executive Committee for Space-Based Positioning, Navigation and Timing
- National GPS Network
- National Geodetic Vertical Datum of 1929
- National Geographic Society – Palomar Observatory Sky Survey
- National Geological Monuments of India
- National Geomagnetism Program
- National Geophysical Research Institute
- National Geothermal Data System
- National Hurricane Research Laboratory
- National Hurricane Research Project
- National Hydrography Dataset
- National Ice Center
- National Ignition Facility
- National Institute for Computational Sciences
- National Institute for Discovery Science
- National Institute for Public Health and the Environment
- National Institute for Space Research
- National Institute for Undersea Science and Technology
- National Institute of Aeronautics and Space
- National Institute of Astrophysics, Optics and Electronics
- National Institute of Information and Communications Technology
- National Institute of Ocean Technology
- National Institute of Polar Research (Japan)
- National Investigations Committee On Aerial Phenomena
- National Land Surveying and Mapping Center
- National Large Solar Telescope
- National Launch System
- National Limited
- National Limited (Amtrak train)
- National Marine Fisheries Service
- National Marine Science Centre, Australia
- National Observatory (Brazil)
- National Observatory of Athens
- National Ocean Service
- National Oceanic and Atmospheric Administration
- National Oceanic and Atmospheric Administration Climate and Societal Interactions Program
- National Oceanic and Atmospheric Administration Fisheries Office of Law Enforcement
- National Oceanic and Atmospheric Administration Pacific Islands Fleet
- National Oceanographic Data Center
- National Oceanographic Partnership Program
- National Optical Astronomy Observatory
- National Planetarium (Manila)
- National Polytechnic School (Ecuador)
- National Prize for Exact Sciences (Chile)
- National Prize for Natural Sciences (Chile)
- National Pyrotechnic Festival
- National Radio Astronomy Observatory
- National Remote Sensing Centre
- National Resources Inventory
- National Science and Media Museum
- National Sea Grant College Program
- National Security Space Launch
- National Sleep Foundation
- National Snow and Ice Data Center
- National Society of Consulting Soil Scientists
- National Solar Observatory
- National Solar Thermal Test Facility
- National Space Agency (Malaysia)
- National Space Biomedical Research Institute
- National Space Centre
- National Space Centre (Malaysia)
- National Space Centre (Moscow)
- National Space Club
- National Space Council
- National Space Development Agency of Japan
- National Space Development Program (Philippines)
- National Space Facilities Control and Test Center
- National Space Institute
- National Space Organization
- National Space Program
- National Space Program (Algeria)
- National Space Program Management Office (GGPEN)
- National Space Research and Development Agency
- National Space Science Agency
- National Space Science Symposium
- National Space Society
- National Spatial Reference System
- National Spherical Torus Experiment
- National Standard Examination in Astronomy
- National Topographic System
- National Toxicology Program
- National Transportation Research Center
- National UFO Reporting Center
- National Undersea Research Center for the North Atlantic and Great Lakes
- National Undersea Research Program
- National Unified Operational Prediction Capability
- National University of Natural Medicine
- National Virtual Observatory
- National Weather Digest
- National Wilderness Conference
- National emblem of Azerbaijan
- National emblem of Belarus
- National emblem of Cape Verde
- National emblem of Indonesia
- National emblem of North Macedonia
- National emblem of Turkey
- National seal of the Comoros
- Natraj Temple
- Natrialba
- Natrinema
- Natrinema versiforme
- Natrocarbonatite
- Natronobacterium
- Natronolimnobius
- Natronorubrum
- Natura Artis Magistra
- Natural Bridges National Monument
- Natural Earth
- Natural Earth projection
- Natural History Review
- Natural History of an Alien
- Natural Resources Forum
- Natural arch
- Natural environment
- Natural hazard
- Natural heritage
- Natural history
- Natural landscape
- Natural resource management
- Natural satellite
- Natural sleep or anesthesia
- Naturaliste (crater)
- Naturama (Futurama)
- Nature
- Nature Anthem
- Nature Astronomy
- Nature Climate Change
- Nature Environment and Pollution Technology
- Nature Farming
- Nature Geoscience
- Nature center
- Nature conservation
- Nature writing
- Naturhistorieselskabet
- Naubakht
- Naubolos (crater)
- Nauka (ISS module)
- Naumann (crater)
- Nautical almanac
- Nautical publications
- Nautical star
- Nautical time
- Nautilus Deep Space Observatory
- Nautilus-X
- NavPix
- Navagraha
- Navagraha Kritis
- Navagraha temples
- Navagraha temples in Tamil Nadu
- Navah Wolfe
- Navajo meridian and baseline
- Naval Battle of Guadalcanal
- Naval Information Warfare Systems Command
- Naval Observatory Vector Astrometry Subroutines
- Naval Ocean Surveillance System
- Naval Space Command
- Navami
- Navamsa (astrology)
- Navapashanam temple
- Navaratna
- Navarro–Frenk–White profile
- Navcam
- NaviDrive
- Navico
- Navicula de Venetiis
- Navid (satellite)
- Navies of landlocked countries
- Navigation (journal)
- Navigation Data Standard
- Navigational Algorithms
- Navigational triangle
- Navigators of Dune
- Navigon
- Navit
- Navizon
- Navlakha temple
- Navman
- Navoi (crater)
- Navstar 7
- Navua Valles
- Navy Global Environmental Model
- Navy Operational Global Atmospheric Prediction System
- Navy Operational Global Atmospheric Prediction System Model
- Navy Pier
- Navy Precision Optical Interferometer
- Nawish (crater)
- Naylor Observatory
- Nazca Lines
- Nazi Love Camp 27
- Nazi UFOs
- Nazi exploitation
- Ndaxagua
- Neaethus
- Neagh Lacus
- Nealbarbital
- Neander (crater)
- Near 3 kpc Arm
- Near Earth Asteroid Prospector
- Near Earth Object Surveillance Satellite
- Near Field Infrared Experiment
- Near Infrared Camera and Multi-Object Spectrometer
- Near side of the Moon
- Near vertical incidence skywave
- Near-Earth Asteroid Scout
- Near-Earth Asteroid Tracking
- Near-Earth Object Coordination Centre
- Near-Earth Object Surveillance Mission
- Near-Earth object
- Near-Earth supernova
- Near-equatorial orbit
- Near-extremal black hole
- Near-horizon metric
- Near-infrared spectroscopy
- Near-rectilinear halo orbit
- Nearby Stars Database
- Nearby Supernova Factory
- Nearch (crater)
- Nearly Neptune
- Neb Duric
- Nebo Zovyot
- Nebra sky disk
- Nebula
- Nebula (character)
- Nebula (computing platform)
- Nebula-75
- Nebulae and Star Clusters
- Nebulae in fiction
- Nebular hypothesis
- Nebulium
- Necho (crater)
- Neck (Chinese constellation)
- Necklace Nebula
- Necopinatidae
- Necronomicon (Nox Arcana album)
- Necrophage
- Necrosol
- Nectarian
- Nedelin catastrophe
- Nederlander Theatre (Chicago)
- Neechabhanga Raja yoga
- Needle Tower
- Needle ice
- Neelakantha (Hindu astrologer)
- Neewollah
- Nefed'ev (crater)
- Nefertem
- Negai (satellite)
- Negative Volcano
- Negative mass
- Negative sign (astrology)
- Negative temperature
- Negligee
- Negros scops owl
- Nehemiah Strong
- Nehru Planetarium
- Neidr Facula
- Neighborhood theatre
- Neil Adger
- Neil Armstrong
- Neil Armstrong Observatory
- Neil Barron
- Neil Cherry
- Neil Clarke (editor)
- Neil Divine
- Neil Gaiman
- Neil Gehrels
- Neil Gehrels Swift Observatory
- Neil Marten
- Neil McCasland
- Neil Peart
- Neil Rushton
- Neil Turok
- Neil deGrasse Tyson
- Neil's Puppet Dreams
- Neill Blomkamp
- Neison (crater)
- Neith (crater)
- Neith (hypothetical moon)
- Nell Gwynne Tavern
- Nelson Bay orthoreovirus
- Nematode
- Nemesis (Star Trek: Voyager)
- Nemesis (hypothetical star)
- Nemesis (video game)
- Nemesis 2 (MSX)
- Nemesis 3: The Eve of Destruction
- Nemesis Games
- Nemetona
- Nemo (arcade game)
- Nemoralia
- Nena (supercontinent)
- Nenfro
- Neo Bomberman
- Neocatastrophism
- Neoclassical transport
- Neolithic circular enclosures in Central Europe
- Neon Joe, Werewolf Hunter
- Neon-burning process
- Neopythagoreanism
- Neotropical realm
- Neozealandia
- Nepal
- Nepal Astronomical Society (NASO)
- Nepal Geological Society
- Nepal PQ-1
- Nepal Sambat
- Nepalese Space Research Association
- NepaliSat-1
- Nepenthes Mensae
- Neper (crater)
- Nephelauxetic effect
- Nephelinite
- Nepheloid layer
- Nephroisospora
- Nephthys
- Neptec Design Group
- Neptune
- Neptune Orbiter
- Neptune in fiction
- Neptune trojan
- Neptune's Brood
- Neptune's Pride
- Neptunian Desert
- Neptunism
- Nereid (moon)
- Nereidum Montes
- Nereus (crater)
- Nergal
- Nergal (crater)
- Nergis Mavalvala
- Nerida Wilson
- Nerilie Abram
- Nerilka's Story
- Nernst (crater)
- Nero Redivivus legend
- Neruda (crater)
- Neruda quadrangle
- Nervo (crater)
- Neso (moon)
- Nestedness
- Net (Chinese constellation)
- Net radiometer
- NetCDF
- NetLander
- NetStorm: Islands At War
- Neta Bahcall
- Netatua Pelesikoti
- Netherlands Agency for Aerospace Programmes
- Netherlands Institute for Space Research
- Netherlands Space Office
- Netherworld Haunted House
- Neto (deity)
- Netrek
- Network for Astronomy School Education
- Network of European Regions Using Space Technologies
- Networked Transport of RTCM via Internet Protocol
- Networks and Spatial Economics
- Netzach
- Neuchâtel Observatory
- Neues Jahrbuch für Geologie und Paläontologie
- Neugrund crater
- Neujmin (crater)
- Neukum (Martian crater)
- Neumann (crater)
- Neumann lines
- Neumayer (crater)
- Neupert effect
- Neuroscience in space
- Neuroscience of sleep
- Neurotoxicity
- Neuschwanstein (meteorite)
- Neuseway Nature Center and Planetarium
- Neutral Buoyancy Laboratory
- Neutral Buoyancy Simulator
- Neutral body posture
- Neutral buoyancy
- Neutral buoyancy pool
- Neutral buoyancy simulation as a training aid
- Neutral density
- Neutral red
- Neutral-beam injection
- Neutralino
- Neutrino
- Neutrino Array Radio Calibration
- Neutrino Ettore Majorana Observatory
- Neutrino Factory
- Neutrino astronomy
- Neutrino decoupling
- Neutrino detector
- Neutrino mass hierarchy
- Neutrino oscillation
- Neutron Star (short story collection)
- Neutron Star (short story)
- Neutron Star Collision (Love Is Forever)
- Neutron Star Interior Composition Explorer
- Neutron Tide
- Neutron backscattering
- Neutron capture nucleosynthesis
- Neutron diffraction
- Neutron interferometer
- Neutron magnetic imaging
- Neutron monitor
- Neutron probe
- Neutron spectroscopy
- Neutron star
- Neutron star merger
- Neutron star spin-up
- Neutron-star oscillation
- Neutronium
- Neveneffecten (cabaret)
- Never Turn Back
- Nevertheless, She Persisted (Supergirl)
- Neves (crater)
- Nevil Story Maskelyne
- Neville Brown (geophysicist)
- Neville Parsons
- New Astronomy (journal)
- New Bethel Baptist Church (Oak Ridge, Tennessee)
- New Beverly Cinema
- New Born
- New Caledonian barn owl
- New Capitol Cinemas
- New Catalogue of Suspected Variable Stars
- New Earth (Christianity)
- New Earth (Doctor Who)
- New England Aquarium
- New England Light Pollution Advisory Group
- New Galilee (the Sixth Epoch)
- New General Catalogue
- New Glenn
- New Hall Inn
- New Hampshire Pumpkin Festival
- New Horizons
- New Horizons 2
- New Jersey State Museum
- New Lands
- New Mexico Exoplanet Spectroscopic Survey Instrument
- New Mexico Museum of Natural History and Science
- New Mexico Spaceport Authority
- New Mexico meridian
- New Morning (club)
- New Norcia Station
- New Plymouth Night Express
- New Plymouth Observatory
- New Shepard
- New Source Performance Standards
- New South Wales XPT
- New South Wales stainless steel carriage stock
- New Technology Telescope
- New Worlds Mission
- New Year's Eve
- New York City Cabaret Card
- New York City Cabaret Law
- New York Mineralogical Club
- New York's Village Halloween Parade
- New Zealand Nationally Significant Collections and Databases
- New Zealand Rocketry Association
- New Zealand Space Agency
- New Zealand bat flea
- New calendarists
- New drilling technologies
- New moon
- New production
- NewSpace India Limited
- Newbie and the Disasternauts
- Newbrook Observatory
- Newcomb (Martian crater)
- Newcomb (lunar crater)
- Newcomb's Tables of the Sun
- Newer Volcanics Province
- Newgrange
- Newhart
- Newman Arms
- Newman–Janis algorithm
- Newmark's influence chart
- Newmark's sliding block
- Newport Arms Hotel
- Newport Music Hall
- Newport News Shipbuilding
- Newporte crater
- News cinema
- News from the New World Discovered in the Moon
- Newsreaders
- Newton (Martian crater)
- Newton (lunar crater)
- Newton (unit)
- Newton Lacy Pierce Prize in Astronomy
- Newton disc
- Newton polygon
- Newton's cannonball
- Newton's identities
- Newton's inequalities
- Newton's law of cooling
- Newton's law of universal gravitation
- Newton's laws of motion
- Newton's minimal resistance problem
- Newton's reflector
- Newton's theorem about ovals
- Newtonian dynamics
- Newtonian gauge
- Newtonian motivations for general relativity
- Newtonian potential
- Newtonian telescope
- Newton–Cartan theory
- Newton–Pepys problem
- Nexcelle
- Next Mars Orbiter
- Next Space Technologies for Exploration Partnerships
- Next-Generation Transit Survey
- Next-generation crewed spacecraft
- Next-to-Minimal Supersymmetric Standard Model
- NextNav
- Nexuiz
- Nexus Tools Platform
- Nexus for Exoplanet System Science
- Nexus: The Jupiter Incident
- Ngai
- Ngami Lacuna
- Nhill (crater)
- Ni Guangjiong
- Ni Wei-tou
- Nia Imara
- Niagara Cave
- Nial Tanvir
- Niall Harrison
- Niall McCrudden
- Niall Shanks
- Niaprazine
- Nibiru (Babylonian astronomy)
- Nibiru cataclysm
- Nic Radford
- Niccolò Arrighetti
- Niccolò Cabeo
- Niccolò Cacciatore
- Niccolò Gianpriamo
- Niccolò Zucchi
- Nice 2 model
- Nice Observatory
- Nice model
- Nicephorus Gregoras
- Nicholas B. Suntzeff
- Nicholas E. Wagman
- Nicholas Kollerstrom
- Nicholas Kratzer
- Nicholas Mayall
- Nicholas Meyer
- Nicholas Patrick
- Nicholas Rush
- Nicholas Sanduleak
- Nicholas of Cusa
- Nicholas of Lynn
- Nicholson (Martian crater)
- Nicholson (lunar crater)
- Nicholson crater
- Nichts von euch auf Erden
- Nick Frost
- Nick Gevers
- Nick Grinde
- Nick Holder
- Nick Jones (entrepreneur)
- Nick Kaiser
- Nick Lowe (classicist)
- Nick Lyon
- Nick Middleton
- Nick Osipczak
- Nick Piantanida
- Nick Pope (journalist)
- Nick Redfern
- Nick Scoville
- Nick Warren
- Nick and the Glimmung
- Nick at Nite
- Nick or Treat!
- Nickelodeon Launch Box
- Nicky Blackmarket
- Nicky Siano
- Nicobar scops owl
- Nicol prism
- Nicola Conte
- Nicola Fox
- Nicola Masini
- Nicolaas Bloembergen
- Nicolae Culianu
- Nicolae Donici
- Nicolai (crater)
- Nicolas Baudin
- Nicolas Cage
- Nicolas Fatio de Duillier
- Nicolas Sarrabat
- Nicolaus Copernicus
- Nicolaus Copernicus Gesamtausgabe
- Nicolaus Mulerius
- Nicolaus Reimers
- Nicole Buckley
- Nicole Capitaine
- Nicole Moudaber
- Nicole Stott
- Nicollet (crater)
- Nicolò D'Amico
- Nicomachus
- Nicosia Cinema Bombing
- Nicotiana sylvestris
- Nidhal Guessoum
- Nidia Morrell
- Nie Haisheng
- Niel Brandt
- Nielsen & Winther
- Nielsen (crater)
- Nien Nunb
- Niepce (crater)
- Nier Prize
- Niesten (crater)
- NigComSat-1
- Nigel Benn
- Nigel Henbest
- Nigel Howard
- Nigel Pennick
- Nigel Weiss
- Niger
- Niger Delta Basin (geology)
- Niger Vallis
- Nigeria EduSat-1
- Nigeria Erosion and Watershed Management Project
- Nigerian weather and communications satellites
- Night
- Night Attack at Târgoviște
- Night Express (B&O train)
- Night Ferry
- Night Glider mode
- Night Launch
- Night Network (Melbourne)
- Night Owl (train)
- Night Riviera
- Night Skies (2007 film)
- Night Sky (magazine)
- Night Sky Network
- Night Tube
- Night Walk (TV series)
- Night Watch (Discworld)
- Night Work Conventions
- Night action at the Battle of Jutland
- Night aviation regulations in the United States
- Night bus lines in Israel
- Night buses in London
- Night combat
- Night eating syndrome
- Night hag
- Night in paintings (Eastern art)
- Night in paintings (Western art)
- Night in the Woods
- Night market
- Night markets in Hong Kong
- Night markets in Taiwan
- Night mayor (municipal title)
- Night of the Auk
- Night of the Cobra Woman
- Night of the Comet
- Night of the Humans
- Night of the Living Dead
- Night of the Living Dead (1990 film)
- Night of the Living Dead (film series)
- Night of the Living Dead 3D
- Night of the Strangler
- Night on Bald Mountain
- Night owl (person)
- Night photography
- Night service (public transport)
- Night skiing
- Night sky
- Night soil
- Night sweats
- Night terror
- Night trains of Norway
- Night-blooming cereus
- NightRide
- NightRider
- NightWatch
- Nightblooming cactus
- Nightcap (1963 TV series)
- Nightcap (drink)
- Nightcap (garment)
- Nightclub
- Nightclub act
- Nightclub management software
- Nightclubs in Greece
- Nightdreams
- Nightfall (1988 film)
- Nightfall (2000 film)
- Nightfall (Asimov novelette and novel)
- Nightflyers (TV series)
- Nightgown
- Nightingale Corona
- Nightjet
- Nightlife
- Nightlife in Bangkok
- Nightlife legislation in New York City
- Nightlife legislation of the United States
- Nightlight
- Nightmare
- Nightmare (1963 The Outer Limits)
- Nightmare (Atmosfear series)
- Nightmare (Marvel Comics)
- Nightmare Revisited
- Nightmare disorder
- Nightmare in Badham County
- Nightmare on Grace Street
- Nightmares & Dreamscapes: From the Stories of Stephen King
- Nightmask
- Nights into Dreams
- Nights: Journey of Dreams
- Nightshade (Butler novel)
- Nightshade (astronomy software)
- Nightshirt
- Nightstand
- Nightstar (train)
- Nightwear
- Nigidius Figulus
- Nihondaira Observatory
- Nihonkai (train)
- Nijland (crater)
- Nik Szymanek
- Nike Smoke
- Nike Zeus
- Nike laser
- Nike-Cajun
- Nike-Hawk
- Nike-Hydac
- Nike-Iroquois
- Nike-Nike
- Nike-Yardbird
- Nikki (comics)
- Nikki Glaser
- Nikodem Popławski
- Nikola Stoyanov
- Nikolaas Tinbergen
- Nikolaev (crater)
- Nikolai Alekhin
- Nikolai Aleksandrovich Kozyrev
- Nikolai Budarin
- Nikolai Chernykh
- Nikolai Dmitriyevich Kuznetsov
- Nikolai Fyodorovich Fyodorov
- Nikolai Kardashev
- Nikolai Kibalchich
- Nikolai P. Barabashov
- Nikolai Rukavishnikov
- Nikolay Basov
- Nikolay Chub
- Nikolay Florea
- Nikolay Moiseev
- Nikolay Moiseyev
- Nikole Lewis
- Nikolya (crater)
- Nikon F
- Nikon GP-1
- Nikon NASA F4
- Nilakantha Somayaji
- Nilesat
- Nilesat 101
- Nilesat 102
- Nilesat 201
- Nili Fossae
- Nili Patera dune field
- Nilo Syrtis
- Nilokeras Scopulus
- Nilosyrtis Mensae
- Nils Bang
- Nils Christoffer Dunér
- Nils Granlund
- Nils Mustelin
- Nilus the Sandman
- Nilus the Sandman: The Boy Who Dreamed Christmas
- Nimbahera stone
- Nimbus 1
- Nimbus 2
- Nimbus 3
- Nimbus 4
- Nimbus 5
- Nimbus 6
- Nimbus 7
- Nimbus B
- Nimbus program
- Nimiq 5
- Nimiq-4
- Nimród Antal
- Nina Simone
- Nine Views
- Nine-ball
- Nines (notation)
- Ning Li (physicist)
- Nininger Meteorite Award
- Niningerite
- Ninmah Corona
- Ninox
- Ninth Cambridge survey at 15GHz
- Ninurta
- Nipah virus infection
- Nipigon (crater)
- Nir Shaviv
- Nirgal Vallis
- Nirupama Raghavan
- Nishina (crater)
- Nishtala Appala Narasimham
- Nissim Kanekar
- Nissim of Gerona
- Nita Aviance
- Nitisol
- Nitrazine
- Nitriding
- Nitrification
- Nitrifying bacteria
- Nitrogen cycle
- Nitrogen dioxide poisoning
- Nitrogen fixation
- Nitrogen nutrition in the arbuscular mycorrhizal system
- Nitrogen-vacancy center
- Nitrosomonas
- Nitrosopumilaceae
- Nitrosopumilales
- Nitrosopumilus
- Nitrososphaera
- Nitrososphaera gargensis
- Nitrous oxide fuel blend
- Nivôse
- Niwaka
- Nix (moon)
- Nizam al-Din al-Nisapuri
- Nizami Cinema Center
- Nizhny Novgorod Planetarium
- Nizāmī (crater)
- Nnewi
- No Doubt About It (Hot Chocolate song)
- No Future (novel)
- No Gravity (video game)
- No Man Friday
- No Man's Sky
- No Mario's Sky
- No Sleep till Brooklyn
- No Way Back (1976 film)
- No-go theorem
- No-hair theorem
- No-observed-adverse-effect level
- No-till farming
- No. 1409 Flight RAF
- Noah Brosch
- Noah Hershkowitz
- Noam Soker
- Nobel (crater)
- Nobeyama radio observatory
- Nobile (crater)
- Nobili (crater)
- Nobody Home
- Nobody Told Me
- Nobuhiro Kawasato
- Nocardioides alpinus
- Nocardiopsis yanglingensis
- Nocera (singer)
- Nocnitsa
- Noctcaelador
- Noctilien
- Noctilionoidea
- Noctis (video game)
- Noctis Labyrinthus
- Noctua (constellation)
- Nocturnal (instrument)
- Nocturnal bottleneck
- Nocturnal clitoral tumescence
- Nocturnal emission
- Nocturnal enuresis
- Nocturnal epilepsy
- Nocturnal house
- Nocturnal penile tumescence
- Nocturnal sleep-related eating disorder
- Nocturnality
- Nodal period
- Nodal precession
- Node 4
- Nodule (geology)
- Noel Hinners
- Noel Slater
- Noel Swerdlow
- Noise regulation
- Noise-immune cavity-enhanced optical heterodyne molecular spectroscopy
- Nojima Fault
- Nomad (video game)
- Nomad rover
- Nomarski prism
- Nommo
- Non Sequitur (Star Trek: Voyager)
- Non-24-hour sleep–wake disorder
- Non-Gaussianity
- Non-Stop (novel)
- Non-achromatic objective
- Non-aqueous phase liquid
- Non-critical string theory
- Non-exact solutions in general relativity
- Non-expanding horizon
- Non-inclined orbit
- Non-inertial reference frame
- Non-neutral plasmas
- Non-orientable wormhole
- Non-rapid eye movement sleep
- Non-rocket spacelaunch
- Non-standard cosmology
- Nonbenzodiazepine
- Noncommutative geometry
- Nondispersive infrared sensor
- Nonequilibrium Gas and Plasma Dynamics Laboratory
- Nonius (crater)
- Nonlimiting water range
- Nonlinear Processes in Geophysics
- Nonpoint source pollution
- Nonsingular black hole models
- Nonsymmetric gravitational theory
- Nonthermal plasma
- Nooitgedacht Glacial Pavements
- Noon
- Noon mark
- Noonlight
- Noor (satellite)
- Noor Muhammad Butt
- Noord (crater)
- Nor'easter (American Horror Story)
- NorShor Theatre
- Norbert Bartel
- Nord Express
- Norden E. Huang
- Nordic Cinema Group
- Nordic Network for Interdisciplinary Environmental Studies
- Nordic Optical Telescope
- Nordic aliens
- Nordstern (club)
- Nordstrom Sisters
- Nordström's theory of gravitation
- Nordtvedt effect
- Norfolk four-course system
- Norio Hayakawa
- Norma (constellation)
- Norma Arm
- Norma Cluster
- Norma Donaldson
- Normal mode
- Normalized Difference Red Edge Index
- Normalized difference vegetation index
- Normalized difference water index
- Norman (crater)
- Norman Adie
- Norman Bolton
- Norman G. Thomas
- Norman Jarosik
- Norman Kendal
- Norman L. Crabill
- Norman Lockyer
- Norman Lockyer Observatory
- Norman Rumsey
- Norman Rydge
- Norman Saunders
- Norman Sperling
- Norman Spinrad
- Norman Surplus
- Norman Thagard
- Normandy (Mass Effect)
- Normanton Down Barrows
- Normapolles
- Norna Robertson
- Norsk Novaselskap
- Norte Grande Geography Journal
- North (1994 film)
- North America Nebula
- North American Board of Certified Energy Practitioners
- North American Cartographic Information Society
- North American Confederacy
- North American DC-3
- North American Meteor Network
- North American Model of Wildlife Conservation
- North American Nanohertz Observatory for Gravitational Waves
- North American Vertical Datum of 1988
- North American X-15
- North American tektite strewn field
- North Atlantic Craton
- North Bar
- North Bay Outlet
- North Cape (Norway)
- North Coast Limited
- North Coast Mail
- North Coast Overnight Express
- North European Plain
- North Gaulton Castle
- North Georgia Astronomical Observatory
- North German Plain
- North Icelandic Jet
- North Macedonia
- North Magnetic Pole
- North Otago Astronomical Society Observatory
- North Pacific Exploring and Surveying Expedition
- North Pacific Intermediate Water
- North Park Theatre
- North Pennine Batholith
- North Polar Basin (Mars)
- North Pole
- North Ray (crater)
- North Star (Amtrak train)
- North Star (NYC train)
- North Star (Star Trek: Enterprise)
- North Water Polynya
- North West Shelf Operational Oceanographic System
- North polar sequence
- North-Eastern Space Applications Centre
- Northeast Syrtis
- Northeastern Space Radio Observatory
- Northern Arrow
- Northern Cross (asterism)
- Northern Extended Millimeter Array
- Northern Gulf Institute
- Northern Hemisphere
- Northern Highlands
- Northern Light (spacecraft)
- Northern Local Supervoid
- Northern Mail
- Northern Pole
- Northern Provinces
- Northern Virginia Astronomy Club
- Northern celestial hemisphere
- Northernmost
- Northrop Grumman
- Northrop Grumman Electronic Systems
- Northrop Grumman Firebird
- Northrop Grumman Guardian
- Northrop Grumman Innovation Systems
- Northrop Grumman Pegasus
- Northrop Grumman RQ-4 Global Hawk
- Northrop Grumman Ship Systems
- Northrop Grumman X-47A Pegasus
- Northrop Grumman X-47B
- Northumberland Astronomical Society
- Northumberland Trough
- Northville Cemetery Massacre
- Northwest Africa 11789
- Northwest Africa 3009
- Northwest Africa 7034
- Northwest Africa 7325
- Northwest Africa 801
- Northwest Atlantic Mid-Ocean Channel
- Northwest Smith
- Norton County (meteorite)
- Norton's Star Atlas
- Norwegian Forest and Landscape Institute
- Norwegian Geotechnical Institute
- Norwegian Institute for Air Research
- Norwegian Journal of Geography
- Norwegian Journal of Geology
- Norwegian Polar Institute
- Norwegian Space Agency
- Norwesters
- Norwich cathedral astronomical clock
- Nose-leaf
- Nosferatu (Helstar album)
- Nosferatu The Vampire (musical)
- Noshiro Rocket Testing Center
- Nostromo Chasma
- Nosturi
- Not Now John
- Not of This Earth (1957 film)
- Nothing comes from nothing
- Notice Advisory to Navstar Users
- Notice to mariners
- Noto (train)
- Noto Radio Observatory
- Notre Dame and Mégantic Mountains
- Nott Corona
- Nottingham Astronomical Society
- Nova
- Nova (laser)
- Nova (novel)
- Nova (rocket)
- Nova Centauri 2013
- Nova Corps
- Nova Persei 2018
- Nova Reticuli 2020
- Nova Sagittarii 1898
- Nova Scotia, Bristol
- Nova remnant
- Nova-C
- Novato meteorite
- Novel ecosystem
- November (Roman month)
- Novette laser
- Novo Cinemas
- Novosphingobium acidiphilum
- Novosphingobium aquaticum
- Novosphingobium arabidopsis
- Novosphingobium barchaimii
- Novosphingobium chloroacetimidivorans
- Novosphingobium endophyticum
- Novosphingobium lentum
- Novosphingobium mathurense
- Novosphingobium panipatense
- Novosphingobium pentaromativorans
- Now & Zen
- Now I Know, Don't Be Scared
- Now I Lay Me Down to Sleep
- Now It's On
- Noynx
- Nozomi (spacecraft)
- Nozzle extension
- Nu (mythology)
- Nu Andromedae
- Nu Aquarii
- Nu Aquilae
- Nu Arae
- Nu Arietis
- Nu Aurigae
- Nu Boötis
- Nu Caeli
- Nu Cancri
- Nu Canis Majoris
- Nu Capricorni
- Nu Cassiopeiae
- Nu Centauri
- Nu Cephei
- Nu Ceti
- Nu Chamaeleontis
- Nu Columbae
- Nu Coronae Borealis
- Nu Cygni
- Nu Doradus
- Nu Draconis
- Nu Eridani
- Nu Fornacis
- Nu Geminorum
- Nu Gruis
- Nu Herculis
- Nu Horologii
- Nu Hydrae
- Nu Hydri
- Nu Leonis
- Nu Leporis
- Nu Lupi
- Nu Lyrae
- Nu Microscopii
- Nu Octantis
- Nu Ophiuchi
- Nu Orionis
- Nu Pavonis
- Nu Pegasi
- Nu Persei
- Nu Phoenicis
- Nu Pictoris
- Nu Piscium
- Nu Puppis
- Nu Sagittarii
- Nu Scorpii
- Nu Serpentis
- Nu Tauri
- Nu Telescopii
- Nu Tucanae
- Nu Ursae Majoris
- Nu Virginis
- Nu1 Boötis
- Nu1 Canis Majoris
- Nu1 Columbae
- Nu1 Coronae Borealis
- Nu1 Lupi
- Nu1 Lyrae
- Nu1 Sagittarii
- Nu2 Arae
- Nu2 Boötis
- Nu2 Canis Majoris
- Nu2 Canis Majoris b
- Nu2 Columbae
- Nu2 Coronae Borealis
- Nu2 Lupi
- Nu2 Lyrae
- Nu2 Sagittarii
- Nu3 Canis Majoris
- NuMI
- NuSTAR
- Nubbin (landform)
- Nucifer experiment
- Nuclear Compton Telescope
- Nuclear Overhauser effect
- Nuclear acoustic resonance
- Nuclear astrophysics
- Nuclear drip line
- Nuclear magnetic resonance database method
- Nuclear magnetic resonance spectra database
- Nuclear magnetic resonance spectroscopy
- Nuclear magnetic resonance spectroscopy of carbohydrates
- Nuclear magnetic resonance spectroscopy of nucleic acids
- Nuclear magnetic resonance spectroscopy of proteins
- Nuclear magnetic resonance spectroscopy of stereoisomers
- Nuclear pasta
- Nuclear power in space
- Nuclear pulse propulsion
- Nuclear resonance fluorescence
- Nuclear resonance vibrational spectroscopy
- Nuclear spectroscopy
- Nuclear star cluster
- Nuclear timescale
- Nucleic acid quantitation
- Nucleocosmochronology
- Nucleogenic
- Nucleosynthesis
- Nucleus for European Modelling of the Ocean
- Nude Nuns with Big Guns
- Nude on the Moon
- Nudist Colony of the Dead
- Nudo de los Pastos
- Nuha (deity)
- Nuit Blanche
- Nujol
- Nuker Team
- Nukie
- Null Island
- Null dust solution
- Null hypersurface
- Nuller
- Number 9 Dream
- Number Eight (Battlestar Galactica)
- Numbers (record label)
- Numenius of Apamea
- Numerical model of the Solar System
- Numerical modeling (geology)
- Numerical relativity
- Numerical weather prediction
- Numerov (crater)
- Numicus
- Nunatak
- Nunatak hypothesis
- Nundinae
- Nunn (crater)
- Nunsploitation
- Nur ad-Din al-Bitruji
- Nureyev (crater)
- Nurse Report
- Nurse Sherri
- Nursery Inn
- Nursing care bed
- Nusantara Satu
- Nut (goddess)
- Nutak (crater)
- Nutation
- Nutation (engineering)
- Nutrient
- Nutrient budgeting
- Nutrient cycle
- Nutrient cycling in the Columbia River Basin
- Nutrient management
- Nutrient pollution
- Nuts and bolts (general relativity)
- Nušl (crater)
- Nyarlathotep
- Nyaruko: Crawling with Love
- Nybyen (crater)
- Nycteria
- Nycteribiidae
- Nymph
- Nymph (1973 film)
- Nympholepsy
- Nyrölä Observatory
- Nyx
- Nyx stream
- Névé
- Nótt
- Nöggerath (crater)
- Nöther (crater)
- Nüwa
- Nüzhet Gökdoğan
- Nābhāsa yoga
- Nāwahī (crater)
- Nōgata meteorite
- O Columbia
- O RLY?
- O'Brien Observatory
- O'Connell effect
- O'Day (crater)
- O'Neill cylinder
- O'Neill's (pub chain)
- O-Cresolphthalein
- O-Solar Meow
- O-type asteroid
- O-type main-sequence star
- O-type star
- O. G. S. Crawford
- O.B.I.T.
- O.R.B: Off-World Resource Base
- O/OREOS
- O3b MEO
- OB star
- OCA–DLR Asteroid Survey
- OCEANUS
- OD600
- ODERACS 2A
- ODERACS 2B
- ODERACS 2C
- ODERACS 2D
- ODERACS 2E
- ODINUS
- OECD Guidelines for the Testing of Chemicals
- OGLE-2003-BLG-235/MOA-2003-BLG-53
- OGLE-2003-BLG-235Lb/MOA-2003-BLG-53Lb
- OGLE-2005-BLG-071L
- OGLE-2005-BLG-071Lb
- OGLE-2005-BLG-169L
- OGLE-2005-BLG-169Lb
- OGLE-2005-BLG-390L
- OGLE-2005-BLG-390Lb
- OGLE-2006-BLG-109L
- OGLE-2006-BLG-109Lb
- OGLE-2006-BLG-109Lc
- OGLE-2007-BLG-349(AB)b
- OGLE-2007-BLG-368L
- OGLE-2007-BLG-368Lb
- OGLE-2014-BLG-0124Lb
- OGLE-2016-BLG-1190Lb
- OGLE-2016-BLG-1195Lb
- OGLE-2017-BLG-1522Lb
- OGLE-2018-BLG-0799Lb
- OGLE-LMC-CEP0227
- OGLE-TR-10
- OGLE-TR-10b
- OGLE-TR-111
- OGLE-TR-111b
- OGLE-TR-113
- OGLE-TR-113b
- OGLE-TR-122
- OGLE-TR-123
- OGLE-TR-132
- OGLE-TR-132b
- OGLE-TR-182
- OGLE-TR-182b
- OGLE-TR-211
- OGLE-TR-211b
- OGLE-TR-56
- OGLE-TR-56b
- OGLE2-TR-L9
- OGLE2-TR-L9b
- OGame
- OH-Suppressing Infrared Integral Field Spectrograph
- OH/IR star
- OHB SE
- OICETS
- OJ 287
- OK-GLI
- OKEANOS
- OMOTENASHI
- ONERA
- OP Andromedae
- OPAL Soil Centre
- OPERA experiment
- OPS 0855
- OPS 3762
- OPS 5111
- OPS 5112
- OPS 5113
- OPS 5114
- OPS 5117
- OPS 5118
- OPS 9794
- OPS-4
- OPS-SAT
- OPUSAT
- OPeNDAP
- ORACLE (computer)
- OREOcube
- OREX
- ORG-20599
- ORG-21465
- ORG-25435
- OS Andromedae
- OSCAR 1
- OSCAR 2
- OSCAR 3
- OSCAR 4
- OSCAR 40
- OSCAR 44
- OSCAR 8
- OSIRIS-REx
- OSO 3
- OSO 7
- OSSI-1
- OSTM/Jason-2
- OTC Satellite Earth Station Carnarvon
- OTE Pathfinder
- OTELO
- OTRAG
- OTS 44
- OU Andromedae
- OU Citizen Science Soil Collection Program
- OU Geminorum
- OU Puppis
- OV1-1
- OV1-2
- OV1-3
- OV2-1
- OV2-3
- OVRO 40 meter Telescope
- OVV quasar
- OY Carinae
- Oak Ridge Leadership Computing Facility
- Oak Ridge National Laboratory
- Oak Ridge National Laboratory Distributed Active Archive Center
- Oak Ridge Observatory
- Oak Ridge School of Reactor Technology
- Oak Street Cinema
- Oakley Observatory
- Oasification
- Oasis
- Oasis (2017 film)
- Oasis crater
- Oasis effect
- Oath of Fealty (novel)
- Ob-Ugric creation myth
- Obduction
- Oberon (moon)
- Oberth (crater)
- Oberth effect
- Obesity hypoventilation syndrome
- Objects in Space
- Oblique foliation
- Oblivion (1994 film)
- Oblivion 2: Backlash
- Obock (crater)
- Obolon' crater
- Obruchev (crater)
- Observable universe
- Observation (video game)
- Observation arc
- Observation balloon
- Observational astronomy
- Observational cosmology
- Observational history of comets
- Observations and explorations of Venus
- Observations of small Solar System bodies
- Observatoire Astronomique de Mont-Soleil
- Observatoire Oceanologique de Villefranche
- Observatoire océanologique de Banyuls-sur-Mer
- Observatory Naef Épendes
- Observatory Vsetín
- Observatory for Heteroscale Magnetosphere-Ionosphere Coupling
- Observatory of Saint-Veran
- Observatory of Strasbourg
- Observatory of Turin
- Observatory of the rue Serpente
- Obsession Telescopes
- Obsidian
- Obstructive sleep apnea
- Occator (crater)
- Occultation
- Occulting disk
- Occupancy frequency distribution
- Occupational exposure limit
- Occupational hazards of solar panel installation
- Occupational heat stress
- Occupational safety and health
- Occupational therapy in the management of seasonal affective disorder
- Occupational toxicology
- Ocean
- Ocean (train)
- Ocean Biodiversity Information System
- Ocean Data Standards
- Ocean Data View
- Ocean Development
- Ocean Elders
- Ocean Explorers Grand Slam
- Ocean Girl
- Ocean Observatories Initiative
- Ocean Park Halloween Bash
- Ocean Science (journal)
- Ocean Under the Ice
- Ocean Worlds Exploration Program
- Ocean acidification
- Ocean acidification in the Great Barrier Reef
- Ocean colonization
- Ocean color
- Ocean dredging
- Ocean fertilization
- Ocean fisheries
- Ocean general circulation model
- Ocean governance
- Ocean heat content
- Ocean observations
- Ocean reanalysis
- Ocean turbidity
- Ocean world
- Oceanic crust
- Oceanic dispersal
- Oceanic physical-biological process
- Oceanisation
- OceanoScientific
- Oceanographic Museum of Monaco
- Oceanography
- Oceanography (journal)
- Oceanography and Marine Biology: An Annual Review
- Oceans (film)
- Oceans Act of 2000
- Oceansat
- Oceansat-1
- Oceansat-2
- Oceanus (Titan orbiter)
- Oceanus Procellarum
- Ocellus Lucanus
- Ocelus
- Ochre-bellied boobook
- Octaeteris
- Octagram
- Octans
- Octans in Chinese astronomy
- Octant (instrument)
- Octantis Mons
- Octavia E. Butler
- Octavius Leigh-Clare
- October (Roman month)
- October Dreams
- Odd Is on Our Side
- Odd Mob
- Odd number theorem
- Odd radio circle
- Oddbjørn Engvold
- Oddworld
- Oddworld Inhabitants
- Oddworld: Abe's Exoddus
- Oddworld: Abe's Oddysee
- Oddworld: Munch's Oddysee
- Oddworld: New 'n' Tasty!
- Oddworld: Soulstorm
- Oddworld: Stranger's Wrath
- Oded Aharonson
- Oded Regev (physicist)
- Odeillo solar furnace
- Odeon Cinemas Group
- Odeon Kino
- Odessa Meteor Crater
- Odette Bancilhon
- Odette Jasse
- Odia calendar
- Odin (satellite)
- Odin Planitia
- Odin-OSIRIS
- Odo Van Maelcote
- Odysseus (crater)
- Odyssey (children's magazine)
- Odyssey (launch platform)
- Odyssey 5
- Odyssey Moon
- Odyssey Space Research
- Oedipus Judaicus
- Oedipus Orca
- Oenopides (crater)
- Oenothera
- Oenothera biennis
- Oenothera caespitosa
- Oenothera californica
- Oenothera deltoides
- Oenothera deltoides subsp. howellii
- Oenothera elata
- Oenothera fruticosa
- Oenothera glazioviana
- Oenothera laciniata
- Oenothera linifolia
- Oenothera longissima
- Oenothera macrocarpa
- Oenothera odorata
- Oenothera perennis
- Oenothera primiveris
- Oenothera pubescens
- Oenothera rosea
- Oenothera speciosa
- Oenothera wolfii
- Oenothera xylocarpa
- Oersted (crater)
- Of Arthour and of Merlin
- Of Stars and Men
- Of a Fire on the Moon
- Ofek-10
- Ofek-11
- Ofek-16
- Ofek-7
- Ofek-9
- Ofeq
- Ofer Lahav
- Off Beat Cinema
- Off on a Comet
- Off the Air (TV series)
- Office of Astronomy for Development
- Office of Coast Survey
- Office of Commercial Space Transportation
- Office of Ocean Exploration and Research
- Office of Oceanic and Atmospheric Research
- Office of Response and Restoration
- Officer Rimmer
- Official Halloween Parody
- Officina Stellare
- Officina Typographica
- Offshore (hydrocarbons)
- Offshore geotechnical engineering
- Offshore survey
- Offworld Trading Company
- Ogdoad (Egyptian)
- Ogdoad (Gnosticism)
- Oggy and the Cockroaches: The Movie
- Ogier the Dane
- Ogygis Undae
- Oh How I Wish I could Sleep Until My Daddy Comes Back Home
- Oh, to Be a Blobel!
- Oh-My-God particle
- Ohana project
- Ohio Public Interest Research Group
- Ohio Sky Survey
- Ohio State Limited
- Ohio State University Radio Observatory
- Ohio Theatre (Cleveland, Ohio)
- Ohio Theatre (Columbus, Ohio)
- Ohio Theatre (Lima, Ohio)
- Ohm (crater)
- Ohmic plasma
- Ohsumi (satellite)
- Oil Mines Regulations-1984
- Oil Region Astronomical Observatory
- Oil Shale (journal)
- Oil constant
- Oil dispersants
- Oil skimmer
- Oil spill
- Oileán Ruaidh (Mars rock)
- Okayama Planet Search Program
- Oken (crater)
- Okhotsk (train)
- Oklahoma Space Industry Development Authority
- Okno
- Okno-S
- Okuro Oikawa
- Olaf Hassel
- Olaf Rogstad
- Olaf Stapledon
- Olapa
- Olav Liestøl
- Olav Orheim
- Olav Tryggvason (statue)
- Olavo de Carvalho
- Olbers (crater)
- Olbers' paradox
- Olbers-Planetarium
- Olcott (crater)
- Old Bell, Fleet Street
- Old Calendarists
- Old Doctor Butler's Head
- Old Farmhouse, Southampton
- Old Hansen Planetarium
- Old Jail, Biggin Hill
- Old Man of the South Pole
- Old Man's War
- Old Man's War series
- Old Mars
- Old Moore's Almanack
- Old Red Lion, Holborn
- Old Red Lion, Kennington
- Old School RuneScape
- Old Ship, Aveley
- Old Ship, Richmond
- Old Spot Inn
- Old Style 1751
- Old Style 1752
- Old Style and New Style dates
- Old Style common year starting on Friday
- Old Style common year starting on Monday
- Old Style common year starting on Saturday
- Old Style common year starting on Sunday
- Old Style common year starting on Thursday
- Old Style common year starting on Tuesday
- Old Style common year starting on Wednesday
- Old Style leap year starting on Friday
- Old Style leap year starting on Monday
- Old Style leap year starting on Saturday
- Old Style leap year starting on Sunday
- Old Style leap year starting on Thursday
- Old Style leap year starting on Tuesday
- Old Style leap year starting on Wednesday
- Old Tunnel State Park
- Old Venus
- Old Weather
- Old White Horse Inn
- Old White Lion, Bury
- Old Woman meteorite
- Oldenburg meteorite
- Older Dryas
- Oldest Dryas
- Oldhamite
- Oldřich Pelčák
- Ole Andreas Krogness
- Ole Humlum
- Ole Lukøje
- Ole Rømer
- Ole Rømer Observatory
- Oleamide
- Oleg Blinov
- Oleg Grigoriyevich Kononenko
- Oleg Grigoryevich Makarov
- Oleg Ivanovsky
- Oleg Kononenko
- Oleg Kotov
- Oleispira
- Olenegorsk Radar Station
- Olga D. González-Sanabria
- Olga Mesmer
- Oligosaprobe
- Oligotroph
- Olin Chaddock Wilson
- Olin J. Eggen
- Olin Observatory
- Olistostrome
- Oliver C. Farrington
- Oliver Keith Baker
- Oliver Observing Station
- Oliver Wendell
- Olivier (crater)
- Olivier Coquelin
- Olivier Doré
- Olivier Gruner
- Olivier de Serres
- Olivier van Noort
- Olli & Lissa
- Ollie Luba
- Olm
- Olney's lesions
- Olof Hiorter
- Olomouc astronomical clock
- Olymp-K
- Olympia Undae
- Olympian Hiawatha
- Olympic (soil)
- Olympica Fossae
- Olympos (novel)
- Olympus Mons
- Olympus Rupes
- Olympus-1
- Omar Chabán
- Omar Khayyam
- Omar Khayyam (crater)
- Omar Tiberiades
- Ombrotrophic
- OmegA
- Omega (laser)
- Omega Andromedae
- Omega Aquarii
- Omega Aquilae
- Omega Aurigae
- Omega Boötis
- Omega Cancri
- Omega Canis Majoris
- Omega Capricorni
- Omega Carinae
- Omega Cassiopeiae
- Omega Centauri
- Omega Cygni
- Omega Draconis
- Omega Eridani
- Omega Fornacis
- Omega Geminorum
- Omega Herculis
- Omega Hydrae
- Omega Leonis
- Omega Lupi
- Omega Men
- Omega Nebula
- Omega Ophiuchi
- Omega Orionis
- Omega Persei
- Omega Piscium
- Omega Sagittarii
- Omega Scorpii
- Omega Serpentis
- Omega Speedmaster
- Omega Tauri
- Omega Ursae Majoris
- Omega Virginis
- Omega1 Aquarii
- Omega1 Aquilae
- Omega1 Cancri
- Omega1 Cygni
- Omega1 Scorpii
- Omega1 Tauri
- Omega2 Aquarii
- Omega2 Aquilae
- Omega2 Cancri
- Omega2 Cygni
- Omega2 Scorpii
- Omega2 Tauri
- Omega: The Last Days of the World
- Omen
- Omen (Star Wars novel)
- Omer Blaes
- Omicron Andromedae
- Omicron Aquarii
- Omicron Aquilae
- Omicron Arietis
- Omicron Aurigae
- Omicron Boötis
- Omicron Cancri
- Omicron Canis Majoris
- Omicron Capricorni
- Omicron Cassiopeiae
- Omicron Centauri
- Omicron Centaurids
- Omicron Cephei
- Omicron Columbae
- Omicron Coronae Borealis
- Omicron Cygni
- Omicron Draconis
- Omicron Eridani
- Omicron Geminorum
- Omicron Gruis
- Omicron Herculis
- Omicron Hydrae
- Omicron Leonis
- Omicron Lupi
- Omicron Ophiuchi
- Omicron Orionis
- Omicron Pegasi
- Omicron Persei
- Omicron Piscium
- Omicron Puppis
- Omicron Sagittarii
- Omicron Scorpii
- Omicron Serpentis
- Omicron Tauri
- Omicron Ursae Majoris
- Omicron Velorum
- Omicron Virginis
- Omicron1 Cancri
- Omicron1 Canis Majoris
- Omicron1 Centauri
- Omicron1 Eridani
- Omicron1 Orionis
- Omicron2 Cancri
- Omicron2 Canis Majoris
- Omicron2 Centauri
- Omicron2 Orionis
- Omid
- Omni-Theatre, Science Centre Singapore
- OmniSTAR
- Omnilingual
- Omolon (meteorite)
- Omoo-Omoo, the Shark God
- Omran Sharaf
- On Body and Soul
- On Cinema
- On My Way to Paradise
- On Orbit Mission Control
- On Sizes and Distances (Hipparchus)
- On Your Own (The Verve song)
- On a Piece of Chalk
- On the Comet
- On the Heavens
- On the Origin of the World
- On the Run (instrumental)
- On the Shoulders of Giants (book)
- On the Silver Globe (film)
- On the Sizes and Distances (Aristarchus)
- On the Steel Breeze
- On the Turning Away
- On-board data handling
- On-orbit satellite servicing
- On-street parking sensing
- Onatah Corona
- Onatas (philosopher)
- Once More* with Footnotes
- Once Upon a Dream (Sleeping Beauty song)
- Once Upon a Halloween
- Once Upon a Planet
- Once Upon a Time (Disney parks)
- Once Upon a Time (Star Trek: Voyager)
- Once Upon a Time... Space
- Ondokuz Mayıs University Observatory
- Ondřejov Observatory
- One Bell
- One Down, Two to Go
- One Man's Dream II: The Magic Lives On
- One Moment of Humanity
- One Slip
- One Small Step (Star Trek: Voyager)
- One Small Step (film)
- One Small Step (novella)
- One Small Step: The Story of the Space Chimps
- One Too Many (1950 film)
- One in Three Hundred
- One of My Turns
- One of Our Planets Is Missing
- One of These Days (instrumental)
- One of the Few
- One-Line Sky
- One-Mile Telescope
- One-electron universe
- OneGeology
- OneSIS
- OneSpace
- OneWeb
- OneWeb satellite constellation
- Oneiric (film theory)
- Oneirocritica
- Oneirogen
- Oneirology
- Oneiromancy
- Oneironautics
- Oneiros
- Onionz
- Onizuka (crater)
- Onizuka Center for International Astronomy
- Onlap
- Online Bomberman
- Online locator service
- Only You Can Save Mankind
- Only in My Dreams
- Only the Good...
- Onon (crater)
- Onsala Space Observatory
- Onset of deconfinement
- Onshore (hydrocarbons)
- Onsite sewage facility
- Onslaught (2009 video game)
- Ontarian River
- Ontario Highway 541
- Ontario Lacus
- Ontario Science Centre
- Onychonycteridae
- Onyx Club
- Ood
- Oolite (video game)
- Oolitic aragonite sand
- Oort cloud
- Oort constants
- Oort limit
- Ooty Radio Telescope
- OpTIIX
- Opacity (optics)
- Opelt (crater)
- Open Astronomy
- Open Concurrent Design Server
- Open Exoplanet Catalogue
- Open Geosciences
- Open House of Horrors
- Open Mike with Mike Bullard
- Open Quaternary
- Open Skies, Closed Minds
- Open Your Eyes (1997 film)
- Open and closed lakes
- Open cluster
- Open cluster family
- Open cluster remnant
- Open terrain
- Open-field system
- Open-geomorphometry project
- OpenArena
- OpenDroneMap
- OpenEV
- OpenEZX
- OpenMI Standard
- OpenMW
- OpenSonATA
- OpenUniverse
- Opening of the North Atlantic Ocean
- Opera Corcontica
- Opera glasses
- Operando spectroscopy
- Operation Argus
- Operation Avalanche (film)
- Operation Bayshield
- Operation Big Ben
- Operation Burnt Frost
- Operation Columbus
- Operation Crossbow
- Operation Dominic
- Operation Fishbowl
- Operation Have Horn
- Operation Highjump
- Operation Moon Rocket
- Operation Moonwatch
- Operation Paperclip
- Operation Phototrack
- Operation Windmill
- Operation: Outer Space
- Operational Land Imager
- Operational Silo Test Facility
- Operational Street Pollution Model
- Operational display system
- Operator product expansion
- Oph 162225-240515
- Oph-IRS 48
- Ophelia (moon)
- Ophir Chasma
- Ophiuchus
- Ophiuchus (astrology)
- Ophiuchus Superbubble
- Ophiuchus Supercluster
- Ophiuchus Supercluster eruption
- Ophiuchus in Chinese astronomy
- Opisometer
- Oppenheimer (crater)
- Oppolzer (crater)
- Opportunity (rover)
- Opposition (astronomy)
- Opposition surge
- Opry Mills
- Optic axis of a crystal
- Optical Gravitational Lensing Experiment
- Optical Mechanics, Inc.
- Optical PAyload for Lasercomm Science
- Optical System for Imaging and low Resolution Integrated Spectroscopy
- Optical Telescope Element
- Optical black hole
- Optical depth
- Optical depth (astrophysics)
- Optical force
- Optical lift
- Optical membrane
- Optical metric
- Optical mineralogy
- Optical mount
- Optical properties of water and ice
- Optical pulsar
- Optical rectenna
- Optical rotation
- Optical rotatory dispersion
- Optical scalars
- Optical solar reflector
- Optical spectrometer
- Optical stretcher
- Optical telescope
- Optical tweezers
- Optical, Spectroscopic, and Infrared Remote Imaging System
- Optically detected magnetic resonance
- Optician
- Opticks (software)
- Optimal estimation
- Optimum water content for tillage
- Optode
- Optus
- Optus (satellite)
- Optus D3
- Oracle (rocket)
- Oral pontine reticular nucleus
- Orange Blossom Special (train)
- Orange Business Services
- Orange County Astronomers
- Oraristrix
- Orazio Grassi
- Orb (astrology)
- Orba (satellite)
- Orbcomm
- Orbex
- Orbit
- Orbit Attitude and Maneuvering System
- Orbit Jet
- Orbit Unlimited
- Orbit determination
- Orbit equation
- Orbit insertion
- Orbit modeling
- Orbit of Mars
- Orbit of Venus
- Orbit of the Moon
- Orbit phasing
- Orbit spectrum
- Orbit@home
- OrbitBeyond
- Orbita (TV system)
- Orbital Debris Co-ordination Working Group
- Orbital Express
- Orbital Insight
- Orbital Mechanics for Engineering Students
- Orbital Piloted Assembly and Experiment Complex
- Orbital Propulsion Centre
- Orbital Reflector
- Orbital Sciences Corporation
- Orbital Sciences X-34
- Orbital Space Plane Program
- Orbital Technologies Commercial Space Station
- Orbital Test Satellite
- Orbital arc
- Orbital decay
- Orbital eccentricity
- Orbital elements
- Orbital inclination
- Orbital inclination change
- Orbital maneuver
- Orbital mechanics
- Orbital module
- Orbital node
- Orbital period
- Orbital plane (astronomy)
- Orbital pole
- Orbital replacement unit
- Orbital replacement unit (HST)
- Orbital ring
- Orbital shell (spaceflight)
- Orbital spaceflight
- Orbital speed
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- Orbital station-keeping
- Orbiter (1986 video game)
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- Orbiter (simulator)
- Orbiter Boom Sensor System
- Orbiter Processing Facility
- Orbiter Vehicle Designation
- Orbiter X
- Orbiting Astronomical Observatory
- Orbiting Astronomical Observatory 2
- Orbiting Binary Black Hole Investigation Satellite
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- Orbiting Carbon Observatory 2
- Orbiting Carbon Observatory 3
- Orbiting Frog Otolith
- Orbiting Geophysical Observatory
- Orbiting Picosat Automatic Launcher
- Orbiting Solar Observatory
- Orbiting Vehicle
- Orbiting body
- Orcein
- Orchid mycorrhiza
- Orcus
- Orcus Patera
- Ordnance Survey
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- Ore shoot
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- Orel (spacecraft)
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- Organa (crater)
- Organic Geochemistry
- Organic geochemistry
- Organisms involved in water purification
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- Organosulfur compounds
- Orgel diagram
- Orgov Radio-Optical Telescope
- Orgueil (meteorite)
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- Oriental bay owl
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- Orientifold
- Origin (TV series)
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- Origin of the Moon
- Origin of water on Earth
- Original Gangstas
- Origins Space Telescope
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- Orioloromano Observatory
- Orion (constellation)
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- Orion (rocket)
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- Orion Arm
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- Orion Nebula
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- Orion in Chinese astronomy
- Orion's Belt
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- Orionids
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- Orión (rocket)
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- Orlando Figueroa
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- Ormond Stone
- Ormsby M. Mitchel
- Ornans (meteorite)
- Ornimegalonyx
- Orogeny
- Orography
- Orontius (crater)
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- Orrery
- Orrori dell'Amore
- Orson Welles (crater)
- Orson Welles Cinema
- Orthent
- Orthopedic mattress
- Orthophoto
- Orthopyroxenite
- Orthosie (moon)
- Orthosilicic acid
- Oryx (journal)
- Osamu Muramatsu
- Osbornite
- Oscar Buneman
- Oscar Chichoni
- Oscar Deutsch
- Oscar Holderer
- Oscar J. Friend
- Oscar Lerman
- Oscar Monnig
- Oscillator strength
- Osculating orbit
- Osebury Rock
- Osipkov–Merritt model
- Osiris
- Osiris (lunar crater)
- Osiris: New Dawn
- Oskar Backlund
- Oskison (crater)
- Oslo Graben
- OsmAnd
- Osmophile
- Osseo meteorite
- Osservatorio Ximeniano
- Ostriker–Peebles criterion
- Ostwald (crater)
- Oswald Lange
- Oswald Lohse
- Oswald Partington, 2nd Baron Doverdale
- Oswald Thomas
- Otbah (crater)
- Oti Fossae
- Otley Run
- Otomedius
- Otomedius Excellent
- Oton Kučera
- Ototrema schildti
- Ott Planetarium
- Otter Creek Observatory
- Ottery St Mary astronomical clock
- Otto August Rosenberger
- Otto Boeddicker
- Otto E. Neugebauer
- Otto Heckmann
- Otto Hilgard Tittmann
- Otto Julius Klotz
- Otto Kippes
- Otto Lesser
- Otto Schmidt
- Otto Struve
- Otto Struve Telescope
- Otto Tetens
- Ottumwa (crater)
- Ouachita geosyncline
- Ouarkziz crater
- Oudemans (crater)
- Ouimetoscope
- Oukaïmeden Observatory
- Our Heavenly Bodies
- Our Mathematical Universe
- Our Mr. Sun
- Our Mrs. Reynolds
- Ourique (meteorite)
- Ouroboros (Red Dwarf)
- Out There Somewhere
- Out and In
- Out of Gas (Firefly)
- Out of Limits
- Out of Space
- Out of Space (game)
- Out of Time (Red Dwarf)
- Out of the Cradle (book)
- Out of the Ordinary Festival
- Out of the Present
- Out of the Silent Planet
- Out-of-body experience
- Outburst flood
- Outcast (Star Wars novel)
- Outcast (video game)
- Outcasts (TV series)
- Outcrop
- Outdoor cinema
- Outer Solar System Origins Survey
- Outer Space Act 1986
- Outer Space Treaty
- Outer Touch
- Outer Wilds
- Outer space
- Outer-grazer
- Outflow channels
- Outland (film)
- Outlander (film)
- Outlaw Star
- Outlaw biker film
- Outlaw of Gor
- Outline of Earth
- Outline of Earth sciences
- Outline of Jupiter
- Outline of Mars
- Outline of Mercury (planet)
- Outline of Neptune
- Outline of Saturn
- Outline of Uranus
- Outline of Venus
- Outline of aerospace
- Outline of air pollution dispersion
- Outline of astronomy
- Outline of black holes
- Outline of cartography
- Outline of galaxies
- Outline of geology
- Outline of hydrology
- Outline of meteorology
- Outline of oceanography
- Outline of plate tectonics
- Outline of solar energy
- Outline of space exploration
- Outline of space science
- Outline of the Moon
- Outpost Mars
- Outremont Theatre
- Outside the Wall (song)
- Outwash plain
- Ouyang Ziyuan
- Ovda Regio
- Over the Edge (film)
- Over the Garden Wall
- Over the Moon (2020 film)
- Overburden
- Overburden pressure
- Overdeepening
- Overhang (rock formation)
- Overillumination
- Overlapping circles grid
- Overload (video game)
- Overprinting (geology)
- Overstep
- Overtone band
- Overview effect
- Overwash
- Overwhelmingly Large Telescope
- Ovid (crater)
- Owen Benjamin
- Owen Biddle Sr.
- Owen Garriott
- Owen Gingerich
- Owen Toon
- Owens Valley Radio Observatory
- Owens Valley Solar Array
- Owl
- Owl Babies
- Owl Moon
- Owl Nebula
- Owl and Pussycat, Shoreditch
- Owl hole
- Owl of Athena
- Owlbear
- Owlboy
- Owly
- Ox (Chinese constellation)
- Ox (zodiac)
- Oxford Cave, Jamaica
- Oxford Geology Group
- Oxia Palus quadrangle
- Oxisol
- Oxomoco
- Oxtotitlán
- Oxygen (Olson and Ingermanson novel)
- Oxygen bar
- Oxygen-burning process
- Oxygenation (environmental)
- Oz Terra
- OziExplorer
- Ozone
- Ozone Mapping and Profiler Suite
- Ozone monitoring instrument
- Ozploitation
- Ozsváth–Schücking metric
- Ozza Mons
- P Carinae
- P Cygni
- P Eridani
- P Leonis
- P Puppis
- P Velorum
- P-Funk Mothership
- P-adic quantum mechanics
- P-nuclei
- P-process
- P-type asteroid
- P. A. L. Chapman-Rietschi
- P. D. Ouspensky
- P. Devadas
- P. J. Clarke's
- P. Schuyler Miller
- P/1997 B1 (Kobayashi)
- P/2010 B2 (WISE)
- P/2011 NO1 (Elenin)
- P/2016 BA14
- P/2016 G1
- P/2019 LD2 (ATLAS)
- PA-99-N2
- PAGASA Observatory
- PAGASA Planetarium
- PAGEOS
- PALAIOS
- PALFA Survey
- PAMELA detector
- PANGAEA (data library)
- PANSAT
- PAS 1
- PAS-22
- PAS-4
- PCDitch
- PCI Geomatica
- PCLake
- PCSat2
- PD AeroSpace
- PDS 110
- PDS 70
- PEGASE
- PEGASUS
- PER3
- PERDaix
- PERISCOP
- PG 1047+003
- PG 1159 star
- PG 1159-035
- PGC 1
- PGC 10922
- PGC 13809
- PGC 214560
- PGC 39058
- PGC 44691
- PGC 54493
- PGC 6240
- PGM-11 Redstone
- PGM-17 Thor
- PGM-19 Jupiter
- PGO waves
- PH1b
- PHL 293B
- PHydrion
- PIA Planetarium, Karachi
- PIA Planetarium, Lahore
- PIA Planetarium, Peshawar
- PICO
- PICRUSt
- PIONIER (VLTI)
- PISat
- PK-3 Plus (ISS experiment)
- PK-4 (ISS experiment)
- PKS 0521-365
- PKS 1302-102
- PKS 2000-330
- PKS 2014-55
- PKS 2155-304
- PKS1353-341
- PL Art of Fireworks
- PLANETS telescope
- PLATO (spacecraft)
- PLCKESZ G286.6-31.3
- PLD Space
- PLate OPtimizer
- PNS Ghazi
- POD (video game)
- POD 2
- POLARBEAR
- POLARIS (seismology)
- POLDER
- POLYGON experiment
- POX 186
- POlarization Emission of Millimeter Activity at the Sun
- PP Carinae
- PP3
- PPK (duo)
- PPM Star Catalogue
- PRECIS
- PRESat
- PRISMA (spacecraft)
- PRL Advanced Radial-velocity All-sky Search
- PROBA
- PROBA-2
- PROBA-3
- PROBA-V
- PROCYON
- PROITERES
- PROMPT Telescopes
- PROTO (fusion reactor)
- PS1-10adi
- PSAT-2
- PSLV-C1
- PSLV-C2
- PSLV-C28
- PSLV-C3
- PSLV-C39
- PSLV-C4
- PSLV-C40
- PSLV-C5
- PSLV-C6
- PSLV-D1
- PSLV-D2
- PSLV-D3
- PSO J030947.49+271757.31
- PSO J318.5−22
- PSR B0329+54
- PSR B0943+10
- PSR B0950+08
- PSR B1257+12
- PSR B1257+12 A
- PSR B1257+12 B
- PSR B1257+12 C
- PSR B1259−63/LS 2883
- PSR B1509−58
- PSR B1620−26
- PSR B1620−26 b
- PSR B1828−11
- PSR B1829−10
- PSR B1919+21
- PSR B1937+21
- PSR J0002+6216
- PSR J0108−1431
- PSR J0337+1715
- PSR J0348+0432
- PSR J0357+3205
- PSR J0437−4715
- PSR J0537−6910
- PSR J0538+2817
- PSR J0540−6919
- PSR J0659+1414
- PSR J0737−3039
- PSR J0738−4042
- PSR J0740+6620
- PSR J0855−4644
- PSR J1141−6545
- PSR J1614−2230
- PSR J1719−1438
- PSR J1719−1438 b
- PSR J1748−2446ad
- PSR J1841−0500
- PSR J1856+0245
- PSR J1903+0327
- PSR J1951+1123
- PSR J2007+2722
- PSR J2032+4127
- PSR J2124−3358
- PSR J2144−3933
- PSSC-2
- PT Pasifik Satelit Nusantara
- PT Puppis
- PTAA GMB Model
- PTScientists
- PU Aurigae
- PU Puppis
- PUFF-PLUME
- PULSAR: Lost Colony
- PV Cephei
- PV Telescopii
- PV Telescopii variable
- PVLAS
- PW-Sat
- PW-Sat2
- PWN-9 Kangaroo
- PX Andromedae
- PX4 autopilot
- PZ Cassiopeiae
- PZ Telescopii
- Paaliaq
- Paasselkä
- Pablo Cottenot
- Pablo Flores
- Pac-Man & Galaga Dimensions
- Pacha Group
- Pachmarhi Telescope Array
- Pacific Border province
- Pacific Coast Ranges
- Pacific Cordillera (Canada)
- Pacific Islands Ocean Observing System
- Pacific Marine Environmental Laboratory
- Pacific Northwest Regional Observatory
- Pacific Ocean
- Pacific Plate
- Pacific Science Center
- Pacific Spaceport Complex – Alaska
- Pacific coast
- Pacific pygmy owl
- Pacific screech owl
- Packing for Mars
- Paczyński–Wiita potential
- Pad Abort Test 1
- Pad Abort Test 2
- Pad Abort-1
- Pad abort test
- Padi Boyd
- Padma Kant Shukla
- Padrón Real
- Padua family
- Padus Vallis
- Padvarninkai meteorite
- Paeniglutamicibacter antarcticus
- Paeniglutamicibacter cryotolerans
- Page layout (cartography)
- Pahinui (crater)
- Paibian
- Painlevé conjecture
- Paint Box (song)
- Painted turtle
- Painters Arms, Luton
- Pair-instability supernova
- Pajama Party (film)
- Pajamas
- Pajamäki Solar System Scale Model
- Pak Protector
- Pakhet
- Pakihi
- Pakistan Mission Control Centre
- Pakistan Remote Sensing Satellite
- Pakistan Technology Evaluation Satellite
- Paksat-1
- Paksat-1R
- Paksha
- Palace Cinemas (Central Europe)
- Palace Theater (Gary, Indiana)
- Palace Theater (Waterbury, Connecticut)
- Palace Theatre (Albany, New York)
- Palace Theatre (Canton, Ohio)
- Palace Theatre (Cincinnati, Ohio)
- Palace Theatre (Columbus, Ohio)
- Palace Theatre (Louisville, Kentucky)
- Palace of the Red Sun
- Palaeococcus
- Palaeococcus ferrophilus
- Palaeococcus helgesonii
- Palaeogeography
- Palaeogeography, Palaeoclimatology, Palaeoecology
- Palaeoglaux
- Palaeontographical Society
- Palaeontological Association
- Palais de la Découverte
- Palapa
- Palapa-D
- Palatini identity
- Palatini variation
- Palatino Express
- Palau owl
- Palawan scops owl
- Palazzo Pescatore
- Palazzo della Ragione, Padua
- Pale Blue Dot
- Pale Blue Dot (book)
- Palearctic realm
- Paleo-Bell River
- Paleoatmosphere
- Paleobiology (journal)
- Paleoceanography
- Paleoceanography and Paleoclimatology
- Paleoclimatology
- Paleocollapse
- Paleocontinent
- Paleogeography of the India–Asia collision system
- Paleogeoscience
- Paleohydrology
- Paleointensity
- Paleolightning
- Paleolimnology
- Paleontological Research Institution
- Paleontological Society
- Paleontological Society Medal
- Paleontology
- Paleopedological record
- Paleopedology
- Paleosalinity
- Paleosol
- Paleosurface
- Paleozoic
- Palermo Astronomical Observatory
- Palermo Cathedral
- Palermo Technical Impact Hazard Scale
- Palimpsest (geology)
- Palimpsest (planetary astronomy)
- Palisa (crater)
- Palisades Center
- Palitzsch (crater)
- Palladium (Stockholm)
- Pallas (crater)
- Pallas family
- Pallas-1
- Pallasite main group
- Pallasovka (meteorite)
- Palle Huld
- Pallene (moon)
- Pallet (furniture)
- Palliasse
- Palm Heinrich Ludwig von Boguslawski
- Palmachim Airbase
- Palmer drought index
- Palmer-Bowlus Flume
- Palmetto (ACL train)
- Palmetto (crater)
- Palmieri (crater)
- Palomar 1
- Palomar 12
- Palomar 2
- Palomar 4
- Palomar 5
- Palomar 6
- Palomar Distant Solar System Survey
- Palomar Observatory
- Palomar Planet-Crossing Asteroid Survey
- Palomar Testbed Interferometer
- Palomar Transient Factory
- Palomar–Leiden survey
- Palos (crater)
- Palsa
- Paludal
- Paludiculture
- Paludification
- Palus Epidemiarum
- Palus Putredinis
- Palus Somni
- Palynology
- Pambu Panchangam
- Pamela Dean
- Pamela M. Kilmartin
- Pamela Matson
- Pamela Melroy
- Pamir Mountains
- Pampas
- Pampu Facula
- Pan (crater)
- Pan (moon)
- Pan American Institute of Geography and History
- Pan Britannica Industries
- Pan Club Copenhagen
- Pan Twardowski
- Pan Zhanchun
- Pan-Andromeda Archaeological Survey
- Pan-STARRS
- PanAmSat
- PanCam
- Panama Creature
- Panama Limited
- Panayiotis Varotsos
- Panbiogeography
- Pancake dome
- Pancam
- Pancha Bhoota
- Panchami
- Panchangam
- Panchikarana
- PandaX
- Pander Society
- Pandia
- Pandia (moon)
- Pandora
- Pandora (TV series)
- Pandora (moon)
- Pandora – The World of Avatar
- Pandoran biosphere
- Pandorum
- Paneth (crater)
- Panethite
- Pangaea
- Pangangaluwa
- Pangboche (crater)
- Panguipulli Formation
- Panguite
- Panhole
- Panic Station
- Panjika
- Pannekoek (crater)
- Pannonia Express
- Pannonian Biogeographic Region
- Pansharpened image
- Panspermia
- Pantages Theatre (Hollywood)
- Pantanal
- Pantellerite
- Pantheon Fossae
- Panther (1986 video game)
- Panther Mountain (New York)
- Panton Arms
- Pantropical
- Pantropy
- Panzano Observatory
- Paolo Antonio Pirazzoli
- Paolo Belletti
- Paolo Chiavenna
- Paolo Farinella
- Paolo Farinella Prize
- Paolo Frisi
- Paolo Maffei
- Paolo Nespoli
- Paolo Padovani
- Paolo Straneo
- Paolo dal Pozzo Toscanelli
- Paoni
- Paoni 1 (Coptic Orthodox liturgics)
- Paoni 10 (Coptic Orthodox liturgics)
- Paoni 11 (Coptic Orthodox liturgics)
- Paoni 12 (Coptic Orthodox liturgics)
- Paoni 2 (Coptic Orthodox liturgics)
- Paoni 3 (Coptic Orthodox liturgics)
- Paoni 4 (Coptic Orthodox liturgics)
- Paoni 5 (Coptic Orthodox liturgics)
- Paoni 6 (Coptic Orthodox liturgics)
- Paoni 7 (Coptic Orthodox liturgics)
- Paoni 8 (Coptic Orthodox liturgics)
- Paoni 9 (Coptic Orthodox liturgics)
- Paopi
- Papaleksi (crater)
- Papaloizou–Pringle instability
- Paparazzi Project
- Papaya (club)
- Papaya, Love Goddess of the Cannibals
- Paper Mario: The Thousand-Year Door
- Paper Thin (Illenium song)
- Paper plane launched from space
- Paper street
- Papers in Regional Science
- Paprika (2006 film)
- Paprika (novel)
- Papuan hawk-owl
- Papuasia
- Parabolic trajectory
- Paracelsus (crater)
- Parachaela
- Paracoccus denitrificans
- Paracone
- Parade of Lost Souls
- Paradise Garage
- Paradise Lost
- Paradise Theater (Bronx)
- Paradises Lost
- Paradox of radiation of charged particles in a gravitational field
- Parafacial zone
- Paragenesis
- Paraglacial
- Paragon Space Development Corporation
- Paragould meteorite
- Paraguay
- Parahita
- Parajata yoga
- Paraldehyde
- Paralithic
- Parallactic angle
- Parallactic instrument of Kapteyn
- Parallax
- Parallax occlusion mapping
- Parallax scanning
- Parallax scrolling
- Parallel 36°30′ north
- Parallel Universe (Red Dwarf)
- Parallel Worlds (book)
- Parallel universes in fiction
- Paralvinella sulfincola
- Paramagnetic nuclear magnetic resonance spectroscopy
- Parameshvara
- Parameterized post-Newtonian formalism
- Parametrization (atmospheric modeling)
- Paramoudra
- Paramount Arts Center
- Paramount Theatre (Anderson, Indiana)
- Paramount Theatre (Denver)
- Paramount Theatre (Middletown, New York)
- Paramount Theatre (New York City)
- Paramount Theatre (Oakland, California)
- Paramount Theatre (Seattle)
- Paramount Theatre Building (Palm Beach, Florida)
- Paranal Observatory
- Paranapanema block
- Paranoid Eyes
- Paranormal Parentage
- Paraná Valles
- Parapatric speciation
- Parascon
- Parasite Planet
- Paraskevopoulos (crater)
- Parasol (satellite)
- Parasomnia
- Paratime series
- Paratropical subsea
- Pardus (video game)
- Paremhat
- Parenago (crater)
- Parent body
- Parent material
- Parent rock
- Parijata
- Paris Observatory
- Paris Pişmiş
- Paris Theatre (Portland, Oregon)
- Paris meridian
- Parissi's slit-faced bat
- Pariṇāmavāda
- Park Forest (meteorite)
- Park Hotel, Teddington
- Parkan (series)
- Parker Solar Probe
- Parkes Catalogue of Radio Sources
- Parkes Observatory
- Parkhurst (crater)
- Parking orbit
- ParkinsonSAT
- Parmenides
- Parmouti
- Parmouti 30 (Coptic Orthodox liturgics)
- Parol
- Parom
- Paroniria
- Parque Arqueológico do Solstício
- Parque Astronómico la Punta
- Parrot (crater)
- Parrot astrology
- Parry (crater)
- Parsec
- Parshall flume
- Parsons (crater)
- Partial discharge
- Partial impact theory
- Partial pressure
- Particle (ecology)
- Particle Astrophysics Magnet Facility
- Particle Physics and Astronomy Research Council
- Particle chauvinism
- Particle horizon
- Particle physics in cosmology
- Particle-induced X-ray emission
- Particulate organic matter
- Particulate pollution
- Partita for Violin No. 3 (Bach)
- Partnership for Observation of the Global Oceans
- Parts-per notation
- Party Monster (film)
- Party Monster: The Shockumentary
- Party popper
- Parus (satellite)
- PasComSat
- Pasar malam
- Pascal (crater)
- Pascal Kleiman
- Pascal Lee
- Pascale Ehrenfreund
- Pascale Garaud
- Pascalis Romanus
- Paschen (crater)
- Paschen's law
- Pashons
- Pashons 1 (Coptic Orthodox liturgics)
- Pashons 10 (Coptic Orthodox liturgics)
- Pashons 11 (Coptic Orthodox liturgics)
- Pashons 12 (Coptic Orthodox liturgics)
- Pashons 13 (Coptic Orthodox liturgics)
- Pashons 14 (Coptic Orthodox liturgics)
- Pashons 15 (Coptic Orthodox liturgics)
- Pashons 16 (Coptic Orthodox liturgics)
- Pashons 17 (Coptic Orthodox liturgics)
- Pashons 18 (Coptic Orthodox liturgics)
- Pashons 19 (Coptic Orthodox liturgics)
- Pashons 2 (Coptic Orthodox liturgics)
- Pashons 20 (Coptic Orthodox liturgics)
- Pashons 21 (Coptic Orthodox liturgics)
- Pashons 22 (Coptic Orthodox liturgics)
- Pashons 23 (Coptic Orthodox liturgics)
- Pashons 24 (Coptic Orthodox liturgics)
- Pashons 25 (Coptic Orthodox liturgics)
- Pashons 26 (Coptic Orthodox liturgics)
- Pashons 27 (Coptic Orthodox liturgics)
- Pashons 28 (Coptic Orthodox liturgics)
- Pashons 29 (Coptic Orthodox liturgics)
- Pashons 3 (Coptic Orthodox liturgics)
- Pashons 30 (Coptic Orthodox liturgics)
- Pashons 4 (Coptic Orthodox liturgics)
- Pashons 5 (Coptic Orthodox liturgics)
- Pashons 6 (Coptic Orthodox liturgics)
- Pashons 7 (Coptic Orthodox liturgics)
- Pashons 8 (Coptic Orthodox liturgics)
- Pashons 9 (Coptic Orthodox liturgics)
- Pasiphae (moon)
- Pasiphae group
- Pasiphaë
- Pasithee (moon)
- Paskal Sotirovski
- Pass (spaceflight)
- Passage de Vénus
- Passage to Pluto
- Passemant astronomical clock
- Passenger drone
- Passengers (2016 film)
- Passivation (spacecraft)
- Past Tense (Star Trek: Deep Space Nine)
- Past sea level
- Pasteur (Martian crater)
- Pasteur (lunar crater)
- Pasteur point
- Pastonian Stage
- Pat Kenny
- Pat Langhorne
- Pat Rawlings
- Pat Sajak
- Patagonian Ice Sheet
- Patapsco Vallis
- Patch dynamics
- Patched conic approximation
- Patera (planetary nomenclature)
- Path-constrained rendezvous
- Pathani Samanta Planetarium
- Pathfinder Technology Demonstrator
- Patience Cowie
- Pati–Salam model
- Patos de Minas (meteorite)
- Patrice Bouchet
- Patrice Franceschi
- Patricia A. Wheeler
- Patricia Ann Straat
- Patricia Margaret Selkirk
- Patricia Ortúzar
- Patricia Robertson
- Patricia S. Cowings
- Patricia Whitelock
- Patricia Wiltshire
- Patrick Baudry
- Patrick Campbell, 3rd Baron Glenavy
- Patrick Douglas Baird
- Patrick Flanagan
- Patrick G. Forrester
- Patrick Gyger
- Patrick H. Diamond
- Patrick Michel
- Patrick Moore
- Patrick Nielsen Hayden
- Patrick Scheuermann
- Patrick Thaddeus
- Patrick Wall
- Patrick Woodroffe
- Patrizia A. Caraveo
- Patronage in astronomy
- Patsaev
- Patterson Medal
- Patti Grace Smith
- Patton Oswalt
- Paul (film)
- Paul A. Shaw
- Paul Alexander (artist)
- Paul Alfred Biefeld
- Paul Allen
- Paul Amnuél
- Paul Baize
- Paul Bennewitz
- Paul Boltwood
- Paul C. Donnelly
- Paul Calle
- Paul Curran (geographer)
- Paul D. Lowman
- Paul Dalglish
- Paul Darden
- Paul Davies
- Paul Delaney (professor)
- Paul Ehmayr
- Paul Frommer
- Paul G. Comba
- Paul Giamatti
- Paul Guldin
- Paul Guthnick
- Paul Götz
- Paul Hainzel
- Paul Harzer
- Paul Hellyer
- Paul Henry and Prosper Henry
- Paul Herget
- Paul Hill (flight director)
- Paul J. Coleman
- Paul J. Lioy
- Paul J. Weitz
- Paul John Ellis
- Paul K. Martin
- Paul Kalas
- Paul Kempf
- Paul Kern (insomniac)
- Paul Kimball
- Paul Kincaid
- Paul Ledoux
- Paul Lockhart
- Paul Louis Mercanton
- Paul M. Sutter
- Paul Masterson
- Paul McNally (astronomer)
- Paul Milford Muller
- Paul Misraki
- Paul Murdin
- Paul Oakenfold
- Paul Oswald Ahnert
- Paul Pellas-Graham Ryder Award
- Paul Pines
- Paul R. Hill
- Paul Racey
- Paul Reiche III
- Paul Robinson Observatory
- Paul Romero
- Paul Rudd (DJ)
- Paul S. Wesson
- Paul Scully-Power
- Paul Shaffer and the World's Most Dangerous Band
- Paul Spudis
- Paul Steinhardt
- Paul Taylor (DJ)
- Paul Tholey
- Paul Verhoeven
- Paul Vigay
- Paul W. Fairman
- Paul W. Hodge
- Paul W. Merrill
- Paul W. Richards
- Paul Wiegert
- Paul Wild (Australian scientist)
- Paul Wild (Swiss astronomer)
- Paul Wild Observatory
- Paul Williams (journalist)
- Paul Wittich
- Paul Youll
- Paul of Dune
- Paul ten Bruggencate
- Paul van Dyk
- Paul-Louis Arslanian
- Paula Jofré
- Pauli (crater)
- Pauline Barmby
- Paulisa Siddhanta
- Paulo Freire (astronomer)
- Paulo R. Holvorcem
- Pauly D
- Paush Purnima
- Pausha
- Pavel Arsenov
- Pavel Belyayev
- Pavel Chekov
- Pavel Evgenjevič Demidov
- Pavel Klushantsev
- Pavel Kroupa
- Pavel Kunaver
- Pavel Petrovich Parenago
- Pavel Popovich
- Pavel Senko
- Pavel Vinogradov
- Pavilion Lake
- Pavilion Lake Research Project
- Pavlov (crater)
- Pavlova Corona
- Pavlovka (meteorite)
- Pavo (constellation)
- Pavo in Chinese astronomy
- Pavo-Indus Supercluster
- Pavonis Mons
- Paw Lagermann
- Pawsey (crater)
- Pax Americana and the Weaponization of Space
- Pax Nova
- Paxton (soil)
- Paxtons Head
- Pay card
- Payload Operations and Integration Center
- Payload fairing
- Payload fraction
- Payload specialist
- Pays interdit
- Paz (satellite)
- Pea galaxy
- Pea soup fog
- Peace Boat
- Peace River (meteorite)
- Peace Vallis
- Peace on Earth (novel)
- Peacemaker (1990 film)
- Peach Mountain Observatory
- Peacock Inn, Islington
- Peak of eternal light
- Peak ring (crater)
- Pearl I. Young
- Peary (crater)
- Pease (crater)
- Pease 1
- Peat
- Pebble accretion
- Pechora Radar Station
- Peculiar galaxy
- Peculiar velocity
- Ped
- Pedalfer
- Peder Horrebow
- Pedestal crater
- Pediment (geology)
- Pedocal
- Pedodiversity
- Pedogenesis
- Pedology
- Pedometric mapping
- Pedosphere
- Pedotope
- Pedotransfer function
- Pedra da Galinha Choca
- Pedro Antonio Valdés Sada
- Pedro Cazanova
- Pedro Cubero
- Pedro Duque
- Pedro E. Zadunaisky
- Pedro G. Ferreira
- Pedro Ordóñez de Ceballos
- Pedro Pablo Kuczynski
- Pedro Paulet
- Pedro Rodriguez (scientist)
- Peek (crater)
- Peek's law
- Peekskill meteorite
- Peeling theorem
- Peeping Times
- Peery's Egyptian Theater
- Pegasids
- Pegasus (constellation)
- Pegasus (satellite)
- Pegasus 1
- Pegasus 2
- Pegasus 3
- Pegasus Dwarf Irregular Galaxy
- Pegasus Dwarf Spheroidal Galaxy
- Pegasus II (rocket)
- Pegasus Toroidal Experiment
- Pegasus in Chinese astronomy
- Peggle Nights
- Peggy Rae Sapienza
- Peggy Whitson
- Pehr Wilhelm Wargentin
- Peignoir
- Peirce (crater)
- Peirescius (crater)
- Pelageya Shajn
- Pelagibacter ubique
- Pelagic red clay
- Pelagic zone
- Pele (volcano)
- Pelican (train)
- Pelican Nebula
- Pelite
- Pellissier Building and Wiltern Theatre
- Peloid (geology)
- Pelotomaculum thermopropionicum
- Peloton (supercomputer)
- Pembina Institute
- Pencil Code
- Pencil Rocket
- Pencil cleavage
- Pendrell Corporation
- Pendular water
- Penelope (crater)
- Penelope Boston
- Peneplain
- Penetration aid
- Penetration depth
- Peneus Patera
- Peng Huanwu
- Penicillium halotolerans
- Peninsula
- Peniocereus
- Peniocereus greggii
- Penitente (snow formation)
- Penitentiary (1979 film)
- Penitentiary II
- Penman equation
- Penman–Monteith equation
- Penn State Lunar Lion Team
- Penn Texas
- Pennines
- Penning ionization
- Penning mixture
- Penning trap
- Penning–Malmberg trap
- Pennsylvania Geological Survey
- Penny Sackett
- Penny Singleton
- Penny in the hole
- Penny4NASA
- Penn–Calvert boundary dispute
- Penouille meteorite
- Penrose Gold Medal
- Penrose criterion
- Penrose diagram
- Penrose process
- Penrose–Hawking singularity theorems
- Pentafluorosulfur hypofluorite
- Pentagram
- Pentecontad calendar
- Penticton (crater)
- Pentland (crater)
- Pentlandite
- Pentobarbital
- Penza Planetarium
- People Are Alike All Over
- People of the Talisman
- People's Liberation Army Astronaut Corps
- PeopleMover
- Peoria Riverfront Museum
- Pepe Deluxé
- Pepi Fabbiano
- Peppermint (entertainer)
- Per Aspera Ad Astra (film)
- Per Barth Lilje
- Per Collinder
- Per Maltby
- Per Olof Hulth
- Per Wimmer
- Perched coastline
- Percival Lowell
- Percolate (Club Night)
- Percolation test
- Percolation trench
- Percy B. Molesworth
- Percy Baynes
- Perdita (moon)
- Perel'man (crater)
- Perelandra
- Perennial stream
- Perennial water
- Perepelkin (Martian crater)
- Perepelkin (lunar crater)
- Peres metric
- Perfect Hair Forever
- Perfect World (Broken Bells song)
- Perfect crystal
- Perfect gas
- Performance bedding
- Perhapsatron
- Peri-Banu (crater)
- Periadriatic Seam
- Peridier (crater)
- Perifocal coordinate system
- Perigean spring tide
- Perigee Aerospace
- Periglacial lake
- Periglaciation
- Period-luminosity relation
- Periodic Bedrock Ridges
- Periodic limb movement disorder
- Periodicity of solar eclipses
- Peripatric speciation
- Perkin (crater)
- Perkunas Virgae
- Perkūnas
- Permaculture
- Permafrost
- Permafrost and Periglacial Processes
- Permanence (novel)
- Permanent European Conference for the Study of the Rural Landscape
- Permanent wilting point
- Permeability (Earth sciences)
- Permeability of soils
- Permian–Triassic extinction event
- Permineralization
- Pernambuco pygmy owl
- Perpendicular paramagnetic bond
- Perpetual Motion (novella)
- Perrine (crater)
- Perrotin (Martian crater)
- Perry Rhodan
- Persbo (crater)
- Perseids
- Persepolis Rising
- Perseus (constellation)
- Perseus Arm
- Perseus Cluster
- Perseus OB1
- Perseus in Chinese astronomy
- Perseus molecular cloud
- Perseus-M
- Perseus-Pisces Supercluster
- Perseus–Pegasus Filament
- Perseverance (rover)
- Persistent, bioaccumulative and toxic substances
- Persona (satellite)
- Personal Egress Air Pack
- Personal Rescue Enclosure
- Personal environmental impact accounting
- Personal equation
- Personal navigation assistant
- Personal preference kit
- Personal protective equipment
- Perspective geological correlation
- Perth Observatory
- Perth Station
- Perturbation (astronomy)
- Perturbed angular correlation
- Pervirella
- Peryton (astronomy)
- Pesanta
- Peshay
- Pesticide drift
- Pet Rock
- Petar Đurković
- Petate
- Petavius (crater)
- Pete (Red Dwarf)
- Pete Bethune
- Pete Conrad
- Pete Frank
- Pete Holmes
- Pete Tong
- Pete Worden
- Pete's Candy Store
- Peter A. Sturrock
- Peter Andreas Hansen
- Peter Andrew Jones
- Peter B. Lawrence
- Peter B. de Menocal
- Peter Barrett (geologist)
- Peter Barton (historian)
- Peter Bergmann
- Peter Bielkowicz
- Peter Capak
- Peter Carl Ludwig Schwarz
- Peter Coles
- Peter Crowther
- Peter Darvill-Evans
- Peter Debye
- Peter Debye Award
- Peter Diamandis
- Peter Dingle
- Peter Doran
- Peter Dunsby
- Peter Elson
- Peter Emshwiller
- Peter F. Mack Jr.
- Peter Fowler (physicist)
- Peter Francis Williams
- Peter Garnavich
- Peter Gatien
- Peter Glaser
- Peter Gleick
- Peter Goldreich
- Peter Gray (writer)
- Peter H. Schultz
- Peter Harris (producer)
- Peter Harrison Planetarium
- Peter Hyams
- Peter Ibbetson
- Peter Jalowiczor
- Peter Jenniskens
- Peter Klaus
- Peter Kolbe
- Peter Kolény
- Peter Kušnirák
- Peter Liss
- Peter Lloyd (illustrator)
- Peter Madden (footballer)
- Peter Madsen
- Peter McCullough
- Peter Medak
- Peter Meyer (astrophysicist)
- Peter Millman
- Peter N. Fedorov
- Peter Naur
- Peter Newman (environmental scientist)
- Peter Nicholls (writer)
- Peter Nickolenko
- Peter Nienow
- Peter Nilson
- Peter Pan disk
- Peter Petroff
- Peter Quinn (astronomer)
- Peter Rauhofer
- Peter Siebold
- Peter Smith (scientist)
- Peter Stampfel
- Peter Stanley Lyons
- Peter Stoner
- Peter Stringfellow
- Peter T. Gallagher
- Peter Theisinger
- Peter Thonemann (physicist)
- Peter Tripp
- Peter Tsou
- Peter W. Heller
- Peter Ward (paleontologist)
- Peter Weston
- Peter Winterbottom
- Peter Wisoff
- Peter in Magicland
- Peter van de Kamp
- Peter's vision of a sheet with animals
- Peterberg Observatory
- Petermann (crater)
- Peters (crater)
- Peterson Field Guides
- Peterson Identification System
- Peterson's long-fingered bat
- Petey (satellite)
- Petey Wheatstraw (film)
- Petipa (crater)
- Petit (crater)
- Petit-Prince (moon)
- Petnica Science Center
- Petr Horálek
- Petr Pravec
- Petra
- Petrarch (crater)
- Petrel (reservoir software)
- Petrel (rocket)
- Petrichor
- Petrie (crater)
- Petrie Prize Lecture
- Petrocalcic Horizon
- Petrogenetic grid
- Petroleum Geoscience
- Petroleum geologist
- Petropavlovskiy (crater)
- Petros Serghiou Florides
- Petrosphere (geology)
- Petrov (crater)
- Petrov classification
- Petrus Alphonsi
- Petrus Apianus
- Petrus Astronomus
- Petrus Plancius
- Petrus Ryff
- Pets (film)
- Pettit (Martian crater)
- Pettit (lunar crater)
- Petuntse
- Petzval (crater)
- Petőfi (crater)
- Pfafstetter Coding System
- Pfahl (Bavarian Forest)
- Pfeiffer effect
- Pfund telescope
- PhTx-1
- PhTx-2
- Phaenon
- Phaeozem
- Phaethon
- Phaethontis quadrangle
- Phaeton (hypothetical planet)
- Phaladeepika
- Phalanx (video game)
- Phalguna
- Phan Xích Long
- Phanerozoic
- Phantasos
- Phantasy Star
- Phantasy Star (video game)
- Phantasy Star 0
- Phantasy Star Collection
- Phantasy Star II
- Phantasy Star III
- Phantasy Star IV
- Phantasy Star Nova
- Phantasy Star Online
- Phantasy Star Online 2
- Phantasy Star Online Episode III: C.A.R.D. Revolution
- Phantasy Star Portable
- Phantasy Star Portable 2
- Phantasy Star Universe
- Phanto of Phlius
- Phantom energy
- Phantom settlement
- Pharaoh's daughter (Exodus)
- PharmaSat
- Pharmacotoxicology
- Pharyngeal aspiration
- Phase angle (astronomy)
- Phase curve (astronomy)
- Phase diagram
- Phase line (cartography)
- Phase response curve
- Phase switch
- Phase-comparison monopulse
- Phase-contrast X-ray imaging
- Phaser Patrol
- Phases of Venus
- Phats & Small
- Pheasant Inn, Bassenthwaite
- Phenibut
- Phenobarbital
- Phenocryst
- Phenol red
- Phenolphthalein
- Phenomenology (physics)
- Pherecydes of Syros
- Phetharbital
- Phi Andromedae
- Phi Aquarii
- Phi Aquilae
- Phi Aurigae
- Phi Boötis
- Phi Cancri
- Phi Capricorni
- Phi Cassiopeiae
- Phi Centauri
- Phi Ceti
- Phi Cygni
- Phi Draconis
- Phi Eridani
- Phi Fornacis
- Phi Geminorum
- Phi Gruis
- Phi Herculis
- Phi Hydrae
- Phi Lab
- Phi Leonis
- Phi Lupi
- Phi Ophiuchi
- Phi Orionis
- Phi Pavonis
- Phi Pegasi
- Phi Persei
- Phi Phoenicis
- Phi Piscium
- Phi Sagittarii
- Phi Serpentis
- Phi Tauri
- Phi Ursae Majoris
- Phi Velorum
- Phi Virginis
- Phi-Sat-1
- Phi1 Cancri
- Phi1 Ceti
- Phi1 Hydrae
- Phi1 Lupi
- Phi1 Orionis
- Phi1 Pavonis
- Phi2 Cancri
- Phi2 Ceti
- Phi2 Hydrae
- Phi2 Lupi
- Phi2 Orionis
- Phi2 Pavonis
- Phi3 Ceti
- Phi3 Hydrae
- Phi4 Ceti
- Phiala E. Shanahan
- Phidias (crater)
- Phil Christensen
- Phil Drummond
- Phil Foglio
- Phil K
- Phil Kieran
- Phil Nicholson
- Phil Pister
- Phil Plait
- Phil Radford
- Philae (spacecraft)
- Philibert Jacques Melotte
- Philip Bono
- Philip Campbell (scientist)
- Philip Carteret
- Philip Childs Keenan
- Philip Coppens (author)
- Philip D. Gingerich
- Philip Fox (astronomer)
- Philip Herbert Cowell
- Philip J. Corso
- Philip J. Klass
- Philip K. Dick
- Philip Melanchthon
- Philip Morris (archivist)
- Philip Morrison
- Philip Morton
- Philip Weller
- Philipp Johann Heinrich Fauth
- Philipp Nicodemus Frischlin
- Philippa Browning
- Philippa Gander
- Philippe Bouchet (illustrator)
- Philippe Druillet
- Philippe Perrin
- Philippe Starck
- Philippe van Lansberge
- Philippine Institute of Volcanology and Seismology
- Philippine International Pyromusical Competition
- Philippine Scientific Earth Observation Microsatellite program
- Philippine Space Agency
- Philippine long-fingered bat
- Philippine scops owl
- Philippine space program
- Philippinite
- Philisidae
- Phill Jupitus
- Phillip Law
- Phillip and Patricia Frost Museum of Science
- Phillips (Martian crater)
- Phillips (lunar crater)
- Phillips Report
- Phillips relationship
- Philolaus
- Philolaus (crater)
- Philophrosyne (moon)
- Philosophiæ Naturalis Principia Mathematica
- Phintys
- Phlegra Dorsa
- Phnom Bakheng
- Phobetor
- Phobos (audio drama)
- Phobos (moon)
- Phobos 1
- Phobos 2
- Phobos And Deimos & Mars Environment
- Phobos Surveyor
- Phobos and Deimos in fiction
- Phobos monolith
- Phobos program
- Phocaea family
- Phocylides (crater)
- Phoebe (Titaness)
- Phoebe (moon)
- Phoebe Regio
- Phoebe Waterman Haas Public Observatory
- Phoebus group
- Phoenicids
- Phoenicis Lacus quadrangle
- Phoenix (constellation)
- Phoenix (spacecraft)
- Phoenix (video game)
- Phoenix Cluster
- Phoenix Dwarf
- Phoenix Five
- Phoenix in Chinese astronomy
- Phoenix of Hiroshima
- PhoneSat
- Phonehenge West
- Phonolite
- Phonotephrite
- Phootprint
- Phosco P107
- Phosphate rich organic manure
- Phosphate solubilizing bacteria
- Phospholipid-derived fatty acids
- Phosphorescence
- Phosphorus (morning star)
- Phosphorus cycle
- Phosphorus trifluorodichloride
- Photo-erosion
- Photo-meson
- Photo-reflectance
- PhotoModeler
- Photoacoustic Doppler effect
- Photoacoustic effect
- Photoacoustic spectroscopy
- Photoaging
- Photobleaching
- Photocatalytic water splitting
- Photochemical Reflectance Index
- Photochromic lens
- Photochromism
- Photodegradation
- Photodisintegration
- Photodissociation
- Photodissociation region
- Photoelastic modulator
- Photoelectrochemical process
- Photoelectron photoion coincidence spectroscopy
- Photoemission electron microscopy
- Photoemission spectroscopy
- Photoevaporation
- Photoexcitation
- Photofission
- Photographic magnitude
- Photoionization
- Photoluminescence
- Photoluminescence excitation
- Photometric parallax
- Photometric redshift
- Photometric system
- Photometric-standard star
- Photometry (astronomy)
- Photon epoch
- Photon polarization
- Photon sphere
- Photon surface
- Photon underproduction crisis
- Photoperiodism
- Photoprotection
- Photopyroelectric
- Photoreceptor protein
- Photosphere
- Photosynth
- Photothermal microspectroscopy
- Photothermal spectroscopy
- Phototoxicity
- Phototrophic biofilm
- Photovoltaic power station
- Phreatic
- Phreatic line
- Phreatic zone
- Phreatomagmatic eruption
- Phrenology
- Phycisphaerae
- Phycosphere
- Phyllic alteration
- Phyllis Draper
- Phyllis Litoff
- Phyllis S. Freier
- Phyllis Zee
- Phyllospondyli
- Phylogenesis (novel)
- Phylogeography
- Phynn
- Physica speculatio
- Physical Geography (journal)
- Physical Research Laboratory
- Physical cosmology
- Physical geodesy
- Physical geography
- Physical geography of Assam
- Physical oceanography
- Physical properties of soil
- Physical theories modified by general relativity
- Physical universe
- Physical vapor deposition
- Physics applications of asymptotically safe gravity
- Physics beyond the Standard Model
- Physics of Plasmas
- Physics of the Earth and Planetary Interiors
- Physiographic province
- Physiographic regions of the world
- Physiologically based pharmacokinetic modelling
- Phytogeography
- Phytogeomorphology
- Phytoremediation
- Phytosociology
- Phytotoxicity
- Phạm Tuân
- Pi Andromedae
- Pi Aquarii
- Pi Aquilae
- Pi Arae
- Pi Arietis
- Pi Aurigae
- Pi Boötis
- Pi Cancri
- Pi Canis Majoris
- Pi Capricorni
- Pi Cassiopeiae
- Pi Centauri
- Pi Cephei
- Pi Ceti
- Pi Chamaeleontis
- Pi Columbae
- Pi Coronae Borealis
- Pi Cygni
- Pi Draconis
- Pi Eridani
- Pi Fornacis
- Pi Geminorum
- Pi Gruis
- Pi Herculis
- Pi Hydrae
- Pi Leonis
- Pi Lupi
- Pi Mensae
- Pi Mensae b
- Pi Orionis
- Pi Pavonis
- Pi Pegasi
- Pi Persei
- Pi Piscis Austrini
- Pi Piscium
- Pi Puppids
- Pi Puppis
- Pi Sagittarii
- Pi Scorpii
- Pi Sculptoris
- Pi Serpentis
- Pi Tauri
- Pi Tucanae
- Pi Ursae Majoris
- Pi Ursae Minoris
- Pi Virginis
- Pi1 Columbae
- Pi1 Cygni
- Pi1 Gruis
- Pi1 Orionis
- Pi1 Pegasi
- Pi1 Ursae Majoris
- Pi1 Ursae Minoris
- Pi2 Columbae
- Pi2 Cygni
- Pi2 Gruis
- Pi2 Orionis
- Pi2 Pegasi
- Pi2 Ursae Minoris
- Pi3 Orionis
- Pi4 Orionis
- Pi5 Orionis
- Pi6 Orionis
- Pianos (club)
- Piazzi (crater)
- Piazzi Smyth (crater)
- Pic du Midi de Bigorre
- PicSat
- Picard (crater)
- Picard (satellite)
- Picard horn
- Picasso (crater)
- Picatrix
- Piccaninny crater
- Piccolo (firecracker)
- Piccolomini (crater)
- Pick-Up (1975 film)
- Pickering (Martian crater)
- Pickering (lunar crater)
- Pickering series
- Pickup ion
- Pico dos Dias Observatory
- PicoDragon
- PicoSAT
- Picrophilaceae
- Picrophilus
- Picrophilus oshimae
- Picrophilus torridus
- Pictet (crater)
- Pictor
- Pictor A
- Pictor in Chinese astronomy
- Picture (string theory)
- Pictureville Cinema
- Pid (video game)
- Pieces (film)
- Piedmont (United States)
- Piera Observatory
- Pierazzo (crater)
- Piero Sicoli
- Pierre Antonini
- Pierre Auger Observatory
- Pierre Duhem
- Pierre Encrenaz
- Pierre J. Thuot
- Pierre Janssen
- Pierre Léna
- Pierre Méchain
- Pierre Sokolsky
- Pierre Teilhard de Chardin
- Pierre Versins
- Pierre Victor Auger
- Piers Anthony
- Piers Sellers
- Pierson's Puppeteers
- Piet Hut
- Pieter Dirkszoon Keyser
- Pieter Johannes van Rhijn
- Pieter Oosterhoff
- Pieter Zeeman
- Pietro Baracchi
- Pietro Catena
- Pietro De Martino
- Pietro Pitati
- Pietro Russo
- Pietro Tacchini
- Piezochromism
- Piezoelectric direct discharge plasma
- Piezophile
- Pig (zodiac)
- Pig's Breakfast
- Piggyback basin
- Pigs (Three Different Ones)
- Pigs on the Wing
- Pikel'ner (crater)
- Pikmin
- Pikmin (video game)
- Pikmin 2
- Pikmin 3
- Pikolin
- Pilar Ruiz-Lapuente
- Pilea cavernicola
- Pillan Patera
- Pillar (landform)
- Pillar of fire (theophany)
- Pillars of Creation
- Pilot (Scream)
- Pilot One
- Pilot Pirx
- Pilot Polder Andijk
- Pilot crater
- Piltzintecuhtli
- Pilâtre (crater)
- Pim Jungerius
- Pinch (plasma physics)
- Pinch point hazard
- Pindus Mons
- Pine Bluff Observatory
- Pineal gland
- Ping pong show
- Pinge
- Pingo
- Pingré (crater)
- Pingualuit crater
- Pink Flamingos
- Pink Palace Museum and Planetarium
- Pinkeye (South Park)
- Pinnacle (geology)
- Pinocchio in Outer Space
- Pinwheel Galaxy
- Pinwheel nebula
- Pioneer (train)
- Pioneer (video game)
- Pioneer 0
- Pioneer 1
- Pioneer 10
- Pioneer 11
- Pioneer 12
- Pioneer 2
- Pioneer 3
- Pioneer 4
- Pioneer 5
- Pioneer 6, 7, 8, and 9
- Pioneer Corporation
- Pioneer H
- Pioneer Limited (train)
- Pioneer One
- Pioneer P-1
- Pioneer P-3
- Pioneer P-30
- Pioneer P-31
- Pioneer Rocketplane
- Pioneer Terra
- Pioneer Venus Multiprobe
- Pioneer Venus Orbiter
- Pioneer Venus project
- Pioneer anomaly
- Pioneer plaque
- Pioneer program
- Pionersky Radar Station
- Piophila
- Pipe Nebula
- Pipeflow
- Pipeline video inspection
- Pipistrellus bat coronavirus HKU5
- Pipitea (planet)
- Pirate Galaxy
- Piratininga crater
- Piromelatine
- Pirquet (crater)
- Pirs (ISS module)
- Pirx (crater)
- Pirx (planet)
- Pisa International Airport
- Pisan calendar
- Pisces (astrology)
- Pisces (constellation)
- Pisces A
- Pisces B
- Pisces Dwarf
- Pisces I (dwarf galaxy)
- Pisces II (dwarf galaxy)
- Pisces V
- Pisces in Chinese astronomy
- Pisces-Eridanus stellar stream
- Pisces–Cetus Supercluster Complex
- Piscis Austrinus
- Piscis Austrinus in Chinese astronomy
- Pises Observatory
- Pisgah Astronomical Research Institute
- Pishgam
- Pismis 24-1
- Pistoia Mountains Astronomical Observatory
- Pistol Nebula
- Pistol Star
- Piszkéstető Station
- Pit cave
- Pit-and-mound topography
- Pitatus (crater)
- Pitaya
- Pitch (ascent/descent)
- Pitch Black (film)
- Pitchstone
- Pitiscus (crater)
- Pittsburgh Sleep Quality Index
- Pittsburgher
- Pityusa Patera
- Pivan-1
- Piwnica pod Baranami
- Pix4D
- Pixxel
- Pizzazz (magazine)
- Pizzetti (crater)
- Place code
- Places & Spaces: Mapping Science
- Placidus Fixlmillner
- Placidus de Titis
- Plage (astronomy)
- Plaggen soil
- Plagiorchis vespertillionis
- Plainfield (soil)
- Plan 9 from Outer Space
- Plana (crater)
- Planar deformation features
- Planar lightwave circuit interferometer
- Planation surface
- Planck (crater)
- Planck (spacecraft)
- Planck particle
- Planck star
- Planctomycetes
- Plane Mad
- Plane of polarization
- Plane of reference
- Planet
- Planet 51
- Planet Explorers
- Planet Hunters
- Planet Labs
- Planet Lofoten
- Planet Nine
- Planet Nomads
- Planet Patrol (project)
- Planet Sheen
- Planet Simulator
- Planet Terror
- Planet Texas
- Planet V
- Planet X637Z-43
- Planet of Adventure
- Planet of Dinosaurs
- Planet of Exile
- Planet of Lust
- Planet of Sound
- Planet of the Apes (1968 film)
- Planet of the Apes (TV series)
- Planet of the Apes (novel)
- Planet of the Ood
- Planet of the Vampires
- Planet symbols
- Planet-hosting stars
- PlanetPol
- PlanetQuest
- PlanetSide
- PlanetSide 2
- PlanetSpace
- Planeta Bur
- Planetario Luis Enrique Erro
- Planetario di Milano
- Planetarium
- Planetarium (Belgium)
- Planetarium (board game)
- Planetarium Jena
- Planetarium Negara
- Planetarium Science Center
- Planetarium hypothesis
- Planetarium of Bogotá
- Planetarium of Medellín
- Planetarium of Nantes
- Planetarium projector
- Planetarium software
- Planetary Data System
- Planetary Defense Coordination Office
- Planetary Fourier Spectrometer
- Planetary Habitability Laboratory
- Planetary Instrument for X-Ray Lithochemistry
- Planetary Observer program
- Planetary Radio
- Planetary Report
- Planetary Resources
- Planetary Science Archive
- Planetary Science Decadal Survey
- Planetary Science Institute
- Planetary Stock Trading
- Planetary and Space Science
- Planetary boundaries
- Planetary cartography
- Planetary chauvinism
- Planetary core
- Planetary differentiation
- Planetary dispositors (Hindu astrology)
- Planetary engineering
- Planetary equilibrium temperature
- Planetary geology
- Planetary habitability
- Planetary hours
- Planetary intelligence
- Planetary management
- Planetary mass
- Planetary migration
- Planetary mnemonic
- Planetary nebula
- Planetary nebula luminosity function
- Planetary nomenclature
- Planetary objects proposed in religion, astrology, ufology and pseudoscience
- Planetary phase
- Planetary protection
- Planetary science
- Planetary series
- Planetary surface
- Planetary surface construction
- Planetary system
- Planetary transits and occultations
- Planetary-mass moon
- Planetesimal
- Planetfall
- Planetfall (novel)
- Planetoids (video game)
- Planets beyond Neptune
- Planets in astrology
- Planets in science fiction
- Planetshine
- Planetárium Praha
- Planifilum composti
- Planifilum fimeticola
- Planifilum fulgidum
- Planifilum yunnanense
- Planimetrics
- Planisphaerium
- Planisphere
- Planitia Descensus
- Plankton, Aerosol, Cloud, ocean Ecosystem
- Planosol
- Plant and Soil
- Plant collecting
- Plant community
- Plant nutrients in soil
- Plant nutrition
- Plant rights
- Plant use of endophytic fungi in defense
- Plants in space
- Planté (crater)
- Planétarium de Reims
- Plaskett (crater)
- Plaskett's Star
- Plasma (physics)
- Plasma Acoustic Shield System
- Plasma Instrument for Magnetic Sounding
- Plasma Physics Laboratory (Saskatchewan)
- Plasma Physics and Controlled Fusion
- Plasma Science and Technology
- Plasma Sources Science and Technology
- Plasma Wave Subsystem
- Plasma acceleration
- Plasma activation
- Plasma actuator
- Plasma afterglow
- Plasma antenna
- Plasma arc welding
- Plasma ashing
- Plasma channel
- Plasma cleaning
- Plasma contactor
- Plasma containment
- Plasma cosmology
- Plasma cutting
- Plasma deep drilling technology
- Plasma diagnostics
- Plasma diffusion
- Plasma etcher
- Plasma etching
- Plasma gasification
- Plasma gasification commercialization
- Plasma globe
- Plasma lamp
- Plasma medicine
- Plasma modeling
- Plasma oscillation
- Plasma parameter
- Plasma parameters
- Plasma polymerization
- Plasma processing
- Plasma propulsion engine
- Plasma railgun
- Plasma receiver
- Plasma recombination
- Plasma scaling
- Plasma shaping
- Plasma sheet
- Plasma speaker
- Plasma stability
- Plasma stealth
- Plasma surface interaction
- Plasma torch
- Plasma transferred wire arc thermal spraying
- Plasma window
- Plasma-enhanced chemical vapor deposition
- Plasma-facing material
- Plasma-immersion ion implantation
- Plasma-powered cannon
- Plasmadynamics and Electric Propulsion Laboratory
- Plasmasphere
- Plasmoid
- Plasmon
- Plasmonic nanoparticles
- Plastic soup
- Plate Boundary Observatory
- Plate reconstruction
- Plate scale
- Plate tectonics
- Plateau de Bure Interferometer
- Plateau–Rayleigh instability
- Platform (geology)
- Platform bed
- Platicrista
- Plato (crater)
- Plato Tiburtinus
- Platteville Atmospheric Observatory
- PlayStation Move Heroes
- Playboy Club
- Playfair (Martian crater)
- Playfair (lunar crater)
- Playfair's law
- Playgirls International
- Plaza Theatre (Atlanta)
- Please Save My Earth
- Plebanski action
- Pleiades
- Pleiades (Greek mythology)
- Pleiades in folklore and literature
- Pleione (star)
- Plenty series
- Plesetsk Cosmodrome
- Plesetsk Cosmodrome Site 131
- Plesetsk Cosmodrome Site 132
- Plesetsk Cosmodrome Site 133
- Plesetsk Cosmodrome Site 16
- Plesetsk Cosmodrome Site 32
- Plesetsk Cosmodrome Site 41
- Plesetsk Cosmodrome Site 43
- Plessite
- Pleuston
- Plinius (crater)
- Plinthite
- Plinthosol
- Ploërmel astronomical clock
- Plucking (glaciation)
- Plug In Baby
- Plug nozzle
- Plumbers Arms, Belgravia
- Plumbosolvency
- Plume (fluid dynamics)
- Plummer (crater)
- Plummer model
- Plump DJs
- Plunge pool
- Plunk
- Plutarch (crater)
- Pluto
- Pluto (song)
- Pluto Energetic Particle Spectrometer Science Investigation
- Pluto Kuiper Express
- Pluto in Scorpio generation
- Pluto in fiction
- Pluton (complex)
- Plutonism
- Pluvial
- Pluviôse
- Plymouth (film)
- Plymouth Coastal Observatory
- Pléiades (satellite)
- PnPSat-1
- Pneumatic chemistry
- Pneumatolysis
- Pneumobilia
- Po Ya (crater)
- PoGOLite
- PoSAT-1
- Pocahontas (train)
- Pochvovedenie
- Pockels effect
- Pocket Bomberman
- Pocket Fleet
- Pocket beach
- Pocket universe
- PocketQube
- Pockmark (geology)
- Pocosin
- Poczobutt (crater)
- Pod Egidą
- Pod People (Invasion of the Body Snatchers)
- Pod's and Jerry's
- Podkayne of Mars
- Podor (crater)
- Podsolisation
- Podzol
- Poe (crater)
- Poe Dameron
- Poet Anderson: The Dream Walker
- Pogo (comic strip)
- Pogo oscillation
- Pogson (crater)
- Poimandres
- Poincaré (crater)
- Poincaré and the Three-Body Problem
- Poinsot (crater)
- Point Arguello
- Point Arguello Launch Complex A
- Point Arguello Launch Complex B
- Point Me at the Sky
- Point Pelee National Park
- Point bar
- Point counting (geology)
- Point diffraction interferometer
- Point of Terror
- Point of interest
- Poisk (ISS module)
- Poison laboratory of the Soviet secret services
- Poisoned candy myths
- Poisoning
- Poisson (crater)
- Poker Night 2
- Pokémon Sun and Moon
- Pokémon Ultra Sun and Ultra Moon
- Pol Swings
- Polar (satellite)
- Polar (star)
- Polar Conservation Organisation
- Polar Geography
- Polar Libraries Colloquy
- Polar Record
- Polar Research
- Polar Research Institute of China
- Polar Science
- Polar Storm
- Polar alignment
- Polar circle
- Polar climate
- Polar desert
- Polar distance (astronomy)
- Polar drift
- Polar ecology
- Polar exploration
- Polar forests of the Cretaceous
- Polar ice cap
- Polar motion
- Polar night
- Polar orbit
- Polar organic chemical integrative sampler
- Polar regions of Earth
- Polar route
- Polar vortex
- Polar wind
- Polar-ring galaxy
- Polaribacter
- Polarimeter
- Polarimeter to Unify the Corona and Heliosphere
- Polarimetry
- Polaris
- Polaris (short story)
- Polaris Flare
- Polarizability
- Polarizable vacuum
- Polarization (waves)
- Polarization in astronomy
- Polarization mixing
- Polarization mode dispersion
- Polarization rotator
- Polarization scrambling
- Polarization spectroscopy
- Polarized light microscopy
- Polarized light pollution
- Polarizer
- Polarizing filter (photography)
- Polaroid (polarizer)
- Polaroid SX-70
- Polder
- Pole Hill
- Pole of Cold
- Pole of inaccessibility
- Pole star
- Poles Apart
- Poles of astronomical bodies
- Police Quest: Open Season
- Policenauts
- Policewomen (film)
- Poligono di Furbara
- Polish Astronomical Society
- Polish Limnological Society
- Polish Soil Classification
- Polish bed
- Polish names in space
- Political Geography (journal)
- Politics of climate change
- Politics of outer space
- Politics of the International Space Station
- Polje
- Polka-dot tree frog
- Pollack (Martian crater)
- Pollen
- Pollen (novel)
- Pollen Analysis Circular
- Pollen DNA barcoding
- Pollen core
- Pollen zone
- Pollutant
- Pollutant-induced abnormal behaviour
- Pollux (star)
- Pollux b
- Polly Bergen
- Poloniny Dark-Sky Park
- Polonnaruwa (meteorite)
- Polonyna (montane meadow)
- Polophylax
- Polskie Zoo
- Polson Pier
- Polyakov action
- Polyakov formula
- Polybius (crater)
- Polybutadiene acrylonitrile
- Polychromophilus
- Polycladomyces abyssicola
- Polyctenidae
- Polycyclic aromatic hydrocarbon
- Polydeuces (moon)
- Polygnotus (crater)
- Polygonal patterned ground
- Polygram (geometry)
- Polymer Battery Experiment
- Polymer fume fever
- Polymorph (Red Dwarf)
- Polynya
- Polyot (rocket)
- Polysleep (company)
- Polysomnographic technologist
- Polysomnography
- Polytantric Circle
- Polytrope
- Polyus (spacecraft)
- Polywell
- Polyyne
- Polzunov (crater)
- Pomona Fox Theater
- Pomortsev (crater)
- Ponce de Leon (train)
- Poncelet (crater)
- Pond
- Pons (crater)
- Ponta do Seixas
- Pontanus (crater)
- Pontic Mountains
- Pontius Pilate's wife
- Pontécoulant (crater)
- Pooh's Heffalump Halloween Movie
- Pool (cue sports)
- Pool of Bethesda
- Pool of Siloam
- Poole versus HAL 9000
- Poona (crater)
- Poor Richard's Almanack
- Pootie Tang
- Popcorn (1991 film)
- Pope Sylvester II
- Popeye Meets the Man Who Hated Laughter
- Popeye, the Ace of Space
- Popigai crater
- Popol Vuh
- Popov (crater)
- Popova (crater)
- Poppy (satellite)
- Popscene (club)
- Popular Astronomy (UK magazine)
- Popular Astronomy (US magazine)
- Population Action International
- Population Connection
- Population and Environment
- Population equivalent
- Population index
- Porbandar stone
- Pore space in soil
- Porkchop plot
- Porky's
- Porn and Chicken
- Porno Holocaust
- Pornochanchada
- Porod's law
- Porosity
- Porphyritic
- Porphyrobacter tepidarius
- Porphyry (geology)
- Port Orford meteorite hoax
- Port Silt Loam
- Porta Maggiore Basilica
- Portable collision avoidance system
- Portage
- Portage Lake Observatory
- Portal (interactive novel)
- Porter (Martian crater)
- Porter (lunar crater)
- Porterhouse Brewery
- Porth (crater)
- Porthole
- Portia (moon)
- Portingbury Hills
- Portland Bowers Roach
- Portland Jordans Roach
- Portlethen Moss
- Portuguese Speleological Society
- Portvision
- Posidonius (crater)
- Position angle
- Position of the Sun
- Positive airway pressure
- Positive energy theorem
- Positive sign (astrology)
- Positron annihilation spectroscopy
- Possum-skin cloak
- Post Impact
- Post common envelope binary
- Post-Newtonian expansion
- Post-Vulgate Cycle
- Post-detection policy
- Post-fire hillslope stabilization treatments
- Post-glacial rebound
- Post-reform radiate
- Postglacial vegetation
- Posthumous Forgiveness
- Pot of Gold (Mars)
- Potamal
- Potamology
- Potassium humate
- Potential cultural impact of extraterrestrial contact
- Potential energy
- Potential vorticity
- Potentially hazardous object
- Potentiometric surface
- Pothole (landform)
- Potsdam Great Refractor
- Potsdam Institute for Climate Impact Research
- Potting soil
- Poul Jensen (astronomer)
- Pounamu
- Pound–Rebka experiment
- Pow R. Toc H.
- Powder diffraction
- Powell (crater)
- Powell Hall
- Power Rangers (song)
- Power Rangers Lost Galaxy
- Power Rangers S.P.D.
- Power Rangers Turbo
- Power Rangers Zeo
- Power Rangers Zeo: Battle Racers
- Power Rangers in Space
- Power Shift
- Power Sword
- Power and Propulsion Element
- Power flash
- Power nap
- Power processing unit
- Power sign (astrology)
- Powered Descent Initiation
- Powerlight Technologies
- Powers Auditorium
- Poya
- Poynting (lunar crater)
- Poynting effect
- Poynting–Robertson effect
- Poznań Observatory
- Pozzo del Merro
- Pożar w burdelu
- Pp-wave spacetime
- Pr0201 b
- Pr0211 b
- Pr0211 c
- Practica (astrology)
- Practical Astronomy with Your Calculator
- Practical Ethics
- Pradosha
- Prager (crater)
- Prague astronomical clock
- Pragyan (rover)
- Prahalad Chunnilal Vaidya
- Praia Grande crater
- Prairial
- Prairie Meteorite Network
- Prairie View Rotamak
- Prairie lake
- Prairie restoration
- Prajval Shastri
- Pranapada
- Prandtl (crater)
- Prandtl-D
- Praskov′ja Georgievna Parchomenko
- Prasna Marga
- Prasna Tantra
- Pratham (satellite)
- Prathama (day)
- Pratiwi Sudarmono
- Prawn Nebula
- Praxidike (moon)
- Praxiteles (crater)
- Prayojana
- Prazitone
- Pre-Nectarian
- Pre-Pastonian Stage
- Pre-Tolstojan
- Pre-lucid dream
- Pre-main-sequence star
- Pre-stellar core
- Precambrian
- Precambrian Research
- Precautionary statement
- Precession
- Precession (mechanical)
- Precession electron diffraction
- Precinct of Amun-Re
- Precious Find
- Precipitation types
- Precipitationshed
- Precise Point Positioning
- Precision Array for Probing the Epoch of Reionization
- Precision Lightweight GPS Receiver
- Precision agriculture
- Precovery
- Precursors (video game)
- Predation problem
- Predator (fictional species)
- Predator (film)
- Predator 2
- Predator trap
- Predators (film)
- Predicted environmental concentration
- Preferred frame
- Pregeometry (physics)
- Prehistoric Orkney
- Preliminary Design of an Experimental World-Circling Spaceship
- Preliminary reference Earth model
- Prelude and Fugue in C major, BWV 870
- Prelude to Space
- Prem Kumar Bhatia
- Prem Saran Satsangi
- Premiere (The Tonight Show Starring Jimmy Fallon)
- Preon star
- Presence (telepresence)
- President's Commission on Implementation of United States Space Exploration Policy
- Presolar grains
- Presqu'île crater
- Pressure (Muse song)
- Pressure melting point
- Pressure ridge (ice)
- Pressure solution
- Pressurized Mating Adapter
- Pressuron
- Press–Schechter formalism
- Prestwich Medal
- Prevention of an Arms Race in Outer Space
- Prey (2017 video game)
- Prey (software)
- Preṣya yoga
- Price Medal
- Price-Whelan 1
- Prichal (ISS module)
- Priest of Nature
- Priestley (Martian crater)
- Priestley (lunar crater)
- Primal (TV series)
- Primary (astronomy)
- Primary atmosphere
- Primary direction
- Primary flight display
- Primary life support system
- Primary rock
- Primate Conservation (journal)
- Prime farmland
- Prime meridian
- Prime meridian (Greenwich)
- Prime vertical
- Primeval Structure Telescope
- Priming (microbiology)
- Primitive equations
- Primocryst
- Primonatalus
- Primordial Inflation Polarization Explorer
- Primordial black hole
- Primordial fluctuations
- Primordial isocurvature baryon model
- Primož Jakopin
- Primum Mobile
- Prince Alfred, Maida Vale
- Prince Barin
- Prince Charles Cinema
- Prince Marko
- Prince Sultan bin Abdulaziz International Prize for Water
- Prince Thun
- Prince Vultan
- Prince of Darkness (film)
- Prince of Teck, Earl's Court
- Prince of Wales, Euston
- Princess Aura
- Princess Charlotte of Saxe-Meiningen
- Princess from the Moon
- Princess of Mars
- Princess of Power
- Princeton Large Torus
- Princeton Ocean Model
- Princeton Plasma Physics Laboratory
- Princeton field-reversed configuration
- Principal Galaxies Catalogue
- Principal Triangulation of Great Britain
- Principal meridian
- Principal meridians of Alaska
- Principia Astronomical Observatory
- Printers Devil, Bristol
- Prinz (crater)
- Prior Castell's Clock
- Priroda
- Prism spectrometer
- Prisma (satellite project)
- Prisoner of Paradise (1980 film)
- Prisoner of the Daleks
- Prisoners of the Lost Universe
- Pristine (company)
- Prithvi
- Private Lessons (1981 film)
- Private School (film)
- Private spaceflight
- Privateer 2: The Darkening
- Privilege Ibiza
- Prix Guzman
- Prix Jules Janssen
- Priyamvada Natarajan
- Pro Wrestlers vs Zombies
- ProSpace
- Probability of precipitation
- Probarbital
- Probes in Space
- Probing Lensing Anomalies Network
- Problem of the creator of God
- Problem of time
- Process-oriented psychology
- Processed Beats
- Prochlorococcus
- Proclus (crater)
- Procrustes (short story)
- Proctor (Martian crater)
- Proctor (lunar crater)
- Proctor's Theatre (Schenectady, New York)
- Procyon
- Prodromus Astronomiae
- Produced water
- Production Corporation Polyot
- Professional Gamers League
- Professor Aristóteles Orsini Planetarium
- Professor Calculus
- Professor Unrat
- Progesterone (medication)
- Proglacial lakes of Minnesota
- Proglacial river
- Prognostic variable
- Prognoz 9
- Progradation
- Program 437
- Programme for Reusable In-orbit Demonstrator in Europe
- Programme on Ecosystem Change and Society
- Progress (spacecraft)
- Progress 1
- Progress 10
- Progress 11
- Progress 12
- Progress 13
- Progress 14
- Progress 15
- Progress 16
- Progress 17
- Progress 18
- Progress 19
- Progress 2
- Progress 20
- Progress 21
- Progress 22
- Progress 23
- Progress 24
- Progress 25
- Progress 26
- Progress 27
- Progress 28
- Progress 29
- Progress 3
- Progress 30
- Progress 31
- Progress 32
- Progress 33
- Progress 34
- Progress 35
- Progress 36
- Progress 37
- Progress 38
- Progress 39
- Progress 4
- Progress 40
- Progress 41
- Progress 42
- Progress 5
- Progress 6
- Progress 7
- Progress 7K-TG
- Progress 8
- Progress 9
- Progress DC-1
- Progress M-01M
- Progress M-02M
- Progress M-03M
- Progress M-04M
- Progress M-05M
- Progress M-06M
- Progress M-07M
- Progress M-08M
- Progress M-09M
- Progress M-1
- Progress M-10
- Progress M-10M
- Progress M-11
- Progress M-11M
- Progress M-12
- Progress M-12M
- Progress M-13
- Progress M-13M
- Progress M-14
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- Progress M-15
- Progress M-15M
- Progress M-16
- Progress M-16M
- Progress M-17
- Progress M-17M
- Progress M-18
- Progress M-18M
- Progress M-19
- Progress M-19M
- Progress M-2
- Progress M-20
- Progress M-20M
- Progress M-21
- Progress M-21M
- Progress M-22
- Progress M-22M
- Progress M-23
- Progress M-23M
- Progress M-24
- Progress M-24M
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- Progress M-26
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- Progress M-27
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- Progress M-28
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- Progress M-29M
- Progress M-3
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- Progress M-4
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- Progress M-5
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- Progress M-65
- Progress M-66
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- Progress M-MIM2
- Progress M-UM
- Progress M1-1
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- Progress M1-5
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- Progress MS-01
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- Progress MS-03
- Progress MS-04
- Progress MS-05
- Progress MS-06
- Progress MS-07
- Progress MS-08
- Progress MS-09
- Progress MS-10
- Progress MS-11
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- Progress MS-13
- Progress MS-14
- Progress MS-15
- Progress MS-16
- Progress MS-17
- Progress MS-18
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- Progress in Human Geography
- Progress in Physical Geography
- Progress-M
- Progress-M1
- Project 1640
- Project 46
- Project 621
- Project A-ko
- Project A119
- Project ALF
- Project Babylon
- Project Beacon
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- Project Dragonfly (space study)
- Project Eagle
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- Project FAMOUS
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- Project Juno
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- Proleptic Julian calendar
- Promethazine
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- Prometheus Bound (Thomas Cole)
- Promethians
- Promicromonosporaceae
- Promine
- Promontorium Agarum
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- Promontorium Deville
- Promontorium Fresnel
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- Promontorium Laplace
- Promontorium Taenarium
- Promontory
- Prompt Global Strike
- Propaganda (indie club night)
- Propagation of light in non-inertial reference frames
- Propallylonal
- Propantes
- Propellant depot
- Propellant mass fraction
- Propellants, Explosives and Rocket Motor Establishment
- Propene
- Proper frame
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- Proper orbital elements
- Properties of water
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- Prophet Motive
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- Propiomazine
- Proplyd
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- Protect-A-Bed
- Protector (Atari Jaguar game)
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- Proterozoic
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- Proteus (satellite)
- Proteus In The Underworld
- Prothipendyl
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- Proton decay
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- Proton satellite
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- Proton200k
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- Protonosphere
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- Protoplanet
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- Protoplast (religion)
- Protostar
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- Protostrigidae
- Proud Mary (film)
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- Provenance (geology)
- Providence (Barry novel)
- Provisional designation in astronomy
- Prowler (satellite)
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- Psalterium Georgii
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- Psamment
- Psammophile
- Pseudarthrobacter chlorophenolicus
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- Pseudoholomorphic curve
- Pseudolite
- Pseudomatrix
- Pseudomonas
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- Pseudomonas teessidea
- Pseudorange
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- Pseudotachylyte
- Psi Andromedae
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- Psi Serpentis
- Psi Tauri
- Psi Ursae Majoris
- Psi Velorum
- Psi Virginis
- Psi-5 Trading Company
- Psi1 Aurigae
- Psi1 Draconis
- Psi1 Lupi
- Psi1 Piscium
- Psi2 Aquarii
- Psi2 Aurigae
- Psi2 Draconis
- Psi2 Lupi
- Psi2 Orionis
- Psi2 Piscium
- Psi3 Aquarii
- Psi3 Aurigae
- Psi3 Piscium
- Psi4 Aurigae
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- Psirens
- Psyche (spacecraft)
- Psycho (Muse song)
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- Psychoanalytic dream interpretation
- Psychological and sociological effects of spaceflight
- Psychological astrology
- Psychological stress and sleep
- Psychology of religion and dreams
- Psychomania
- Psychosocial hypothesis
- Psychrobacter
- Psychrobacter aquaticus
- Psychrobacter frigidicola
- Psychrobacter immobilis
- Psychrobacter marincola
- Psychrobacter okhotskensis
- Psychrobacter pacificensis
- Psychrobacter submarinus
- Psychrobacter vallis
- Psychroflexus
- Psychrometric constant
- Psychrophile
- Psychroserpens burtonensis
- Pt/Co scale
- Pteronotus
- Pteropodinae
- Ptichka
- Ptolemaeus (Martian crater)
- Ptolemaeus (lunar crater)
- Ptolemy
- Ptolemy's table of chords
- Pub
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- Pub Philosophy
- Pub chain
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- Publications of the Astronomical Society of Australia
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- Pucadyil Ittoop John
- Puchezh-Katunki crater
- Puchi Puchi Virus
- Puck (moon)
- Puddle
- Puducherry Science Centre & Planetarium
- Puebla tunnels
- Puerto Rican barn owl
- Puerto Rican owl
- Puff model
- Pugas
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- Pugu (deity)
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- Pujiang-1
- Pulau virus
- Puli Space Technologies
- Pulkovo Observatory
- Pulkovo meridian
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- Puls (company)
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- Pulsar kick
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- Pulsating white dwarf
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- Pulsatrix
- Pulse-Doppler radar
- Pulsed Pressure Cavitation Technique
- Pulsed accretion
- Pulsed electron paramagnetic resonance
- Pultusk (meteorite)
- Pumpkin
- Pumpkin Walk
- Pumpkin pie
- Pumpkin queen
- Pumpkinhead (film)
- Puna Geothermal Venture
- Punarvasu
- Punch Pubs
- Punga Mare
- Punk (fireworks)
- Punk Love
- Punta Lobos
- Punta Mariato
- Punta Pariñas
- Pupin (crater)
- Puppet Master (film)
- Puppeteer (video game)
- Puppis
- Puppis A
- Puppis in Chinese astronomy
- Purbach (crater)
- Purcell (crater)
- Pure shear
- Purkyně (crater)
- Purnima
- Purple Crow Lidar
- Purple Death from Outer Space
- Purple Earth hypothesis
- Purple Forbidden enclosure
- Purple Mountain Observatory
- Purple moor grass and rush pastures
- Purusha Sukta
- Push broom scanner
- Push moraine
- Push the Talking Trash Can
- Pushan
- Pushchino Radio Astronomy Observatory
- Pushing Ice
- Pushya
- Puspawarna
- Pussycat Theaters
- Put Your Head on My Shoulders
- Puthumana Somayaji
- Puttingal temple fire
- Puńsk (crater)
- Pwyll (crater)
- PyCBC
- PyEphem
- Pydna (missile base)
- Pygmy (Greek mythology)
- Pyotr Dolgov
- Pyotr Klimuk
- Pyotr Kolodin
- Pyramid of the Moon
- Pyramid wavefront sensor
- Pyramids (novel)
- Pyramids of Mars
- Pyrenees
- Pyrgeometer
- Pyrheliometer
- Pyrithyldione
- Pyro Spectaculars
- Pyrobaculum
- Pyrobaculum aerophilum
- Pyroclastic rock
- Pyrococcus
- Pyrococcus abyssi
- Pyrococcus furiosus
- Pyrococcus horikoshii
- Pyrococcus woesei
- Pyrodictiaceae
- Pyrodictium
- Pyrodictium abyssi
- Pyroeis
- Pyrolobus
- Pyrolobus fumarii
- Pyrometamorphism
- Pyrometer
- Pyrotechnic valves
- Pyrotecnico
- Pyroxenite
- Pythagoras
- Pythagoras (crater)
- Pythagorean astronomical system
- Pythagorean hammers
- Pythagorean tuning
- Pythagoreanism
- Pytheas (crater)
- Pyxis
- Pyxis globular cluster
- Pyxis in Chinese astronomy
- Pál (crater)
- Pão-por-Deus
- Päivätär
- Père David's owl
- Péter Mészáros
- Pārijāta yoga
- Pōniuāʻena
- Příbram meteorite
- Pūrva Bhādrapadā
- Q Carinae
- Q Centauri
- Q Cygni
- Q Eridani
- Q Puppis
- Q Scorpii
- Q Velorum
- Q and R Holes
- Q star
- Q-PACE
- Q-machine
- Q-type asteroid
- Q0906+6930
- Q2343-BX418
- QCD matter
- QCD vacuum
- QDGC
- QFX Cinemas
- QH-II-66
- QMAP
- QR Andromedae
- QS Aquilae
- QS Telescopii
- QS Virginis
- QSO B0839+187
- QSO J0005-0006
- QSR J1819+3845
- QU Normae
- QU Vulpeculae
- QUIET
- QUIJOTE CMB Experiment
- QUaD
- QV Andromedae
- QV Normae
- QW Puppis
- QX Andromedae
- QX Normae
- QZ Aurigae
- QZ Carinae
- QZ Puppis
- Qadamgah (ancient site)
- Qanta A. Ahmed
- Qatar 1
- Qatar-2
- Qatar-3b
- Qatar-4b
- Qatar-5b
- QepHom
- Qi Baishi (crater)
- Qi Faren
- Qian Xuesen
- Qiangtang terrane
- Qibla observation by shadows
- Qidong (meteorite)
- Qingdao Observatory
- Qingde Wang
- Qinling–Huaihe Line
- Qitai Radio Telescope
- Qiu Ying (crater)
- Qiudong Wang
- Qolla l-Bajda Battery
- Qu Qinyue
- Quad (rocket)
- Quad God
- Quadrail series
- Quadrangle (geography)
- Quadrangle of Henie
- Quadrans Muralis
- Quadrans Vetus
- Quadrant (instrument)
- Quadrant Park
- Quadrantids
- Quadrature (astronomy)
- Quadrilateralized spherical cube
- Quadrupole
- Quadrupole formula
- Quadrupole ion trap
- Quagmire's Quagmire
- Quake (natural phenomenon)
- Quake (series)
- Quake (video game)
- Quake 4
- Quake Army Knife
- Quake Champions
- Quake Done Quick
- Quake II
- Quake II engine
- Quake III Arena
- Quake Live
- Quake engine
- Quake modding
- QuakeC
- QuakeCon
- QuakeNet
- QuakeWorld
- Quakesat
- Quantitative precipitation estimation
- Quantitative precipitation forecast
- Quantitative storytelling
- Quantized inertia
- Quantum Detectors
- Quantum Experiments at Space Scale
- Quantum Quest: A Cassini Space Odyssey
- Quantum cohomology
- Quantum cosmology
- Quantum efficiency
- Quantum field theory in curved spacetime
- Quantum fluctuation
- Quantum foam
- Quantum geometry
- Quantum gravity
- Quantum jump
- Quantum mechanics of time travel
- Quantum photoelectrochemistry
- Quantum shape dynamics
- Quantum telescope
- Quantum vacuum thruster
- Quantum yield
- Quantum-optical spectroscopy
- Quarantine (Red Dwarf)
- Quark (TV series)
- Quark epoch
- Quark star
- Quark, Strangeness and Charm (song)
- Quark-nova
- Quark–gluon plasma
- Quarter stick
- Quarterly Journal of Engineering Geology & Hydrogeology
- Quarterly Journal of the Royal Meteorological Society
- Quartz latite
- Quasar
- Quasar Equatorial Survey Team
- Quasars, Redshifts and Controversies
- Quasi Universal Intergalactic Denomination
- Quasi-Arc Company
- Quasi-Hilda comet
- Quasi-Zenith Satellite System
- Quasi-periodic oscillation
- Quasi-satellite
- Quasi-star
- Quatermass and the Pit (film)
- Quaternary
- Quaternary Geochronology
- Quaternary International
- Quaternary Research
- Quaternary Science Reviews
- Quazepam
- Qubic experiment
- Qubit fluorometer
- Quebec City stabbing
- Queeg (Red Dwarf)
- Queen Elizabeth Planetarium
- Queen Emeraldas
- Queen Millennia
- Queen Victoria Museum and Art Gallery
- Queen and Crescent Limited
- Queen of Angels (novel)
- Queen of Blood
- Queen of Dreams
- Queen of Outer Space
- Queen of the Empire
- Queen of the Night aria
- Queen's Arms, Cowden Pound
- Queen's Head, Bramfield
- Queen's Head, Brook Green
- Queen's Head, Newton
- Queen's Head, Pinner
- Queen's Head, Stepney
- Queen's Head, Stockwell
- Queen's Head, Tolleshunt D'Arcy
- Queen's Head, Uxbridge
- Queen's Hotel, Primrose Hill
- Queens Night Market
- Queens at Heart
- Quenching (astronomy)
- Quenching (fluorescence)
- Quenisset (crater)
- Quentin Harris
- Quesnellia
- Quest Aerospace
- Quest Joint Airlock
- Quest for the Future
- Quest of the Space Beagle
- Quest: The History of Spaceflight
- Questar Corporation
- Question and Answer (novel)
- Quetelet (crater)
- Quetiapine
- QuetzSat 1
- Quetzalcoatl
- Quetzalpetlatl Corona
- Qui-Gon & Obi-Wan
- Quick clay
- Quick condition
- QuickBird
- Quicklaunch
- Quicksand
- Quidlivun Cavus
- QuikSCAT
- Quill (satellite)
- Quinaldine red
- Quindar tones
- Quintana Roo Speleological Survey
- Quintessence (physics)
- Quintilis
- Quintom scenario
- Quintuplet cluster
- Quintus Sextius
- Quito Astronomical Observatory
- Quitsato Sundial
- Quiz League of London
- Quiz league
- Qumran "Horoscopes" (4Q186)
- Quoits
- Quseir Formation
- Qusta ibn Luqa
- Qutb al-Din al-Shirazi
- Quthing (crater)
- Qāḍī Zāda al-Rūmī
- Qʼuqʼumatz
- R Andromedae
- R Apodis
- R Aquarii
- R Aquilae
- R Arae
- R Aurigae
- R Boötis
- R Cancri
- R Canis Majoris
- R Canum Venaticorum
- R Capricorni
- R Carinae
- R Cassiopeiae
- R Centauri
- R Coronae Australis
- R Coronae Borealis
- R Corvi
- R Crucis
- R Cygni
- R Doradus
- R Equulei
- R Geminorum
- R Horologii
- R Hydrae
- R Leonis
- R Leonis Minoris
- R Leporis
- R Lyrae
- R Microscopii
- R Monocerotis
- R Muscae
- R Normae
- R Octantis
- R Pictoris
- R Puppis
- R Reticuli
- R Sagittae
- R Sculptoris
- R Scuti
- R Serpentis
- R Trianguli Australis
- R Ursae Minoris
- R Virginis
- R-16 (missile)
- R-26 (missile)
- R-29RMU2 Layner
- R-36 (missile)
- R-46 (missile)
- R-7 Semyorka
- R-9 Desna
- R-hadron
- R-parity
- R-process
- R-symmetry
- R-type asteroid
- R. A. Lewcock
- R. Brent Tully
- R. Catesby Taliaferro
- R. Dale Reed
- R. F. Joyce Observatory
- R. H. Stoy
- R. J. Dwayne Miller
- R. J. W. Douglas Medal
- R. Jay GaBany
- R. K. Chetty Pandipati
- R. Michael Rich
- R. Paul Butler
- R. S. A. Garcia
- R. Scott Dunbar
- R136
- R136a1
- R136a2
- R136a3
- R136b
- R136c
- R145
- R71 (star)
- R85
- R99
- RAAF Woomera Range Complex
- RACE (Remote Applications in Challenging Environments)
- RAD5500
- RAD750
- RADARSAT Constellation
- RADOM-7
- RADiations Effects on Components and Systems
- RAF Fylingdales
- RAF Oakhanger
- RAF Spadeadam
- RAFGL
- RAFOS float
- RAM (DJ)
- RAPID-L
- RASAT
- RATAN-600
- RAVE (survey)
- RAX-2
- RB 199
- RBC EXT8
- RC Optical Systems
- RCI Hospitality Holdings
- RCS2 J2327
- RCW 103
- RCW 120
- RCW 34
- RCW 36
- RCW 38
- RCW 49
- RCW 79
- RCW 88
- RCW Catalogue
- RD-0110R
- RD-0216
- RD-0233
- RD-0236
- RD-0237
- RD-0243
- RD-0255
- RD-0410
- RD-843
- RD-855
- RD-856
- RD-861
- RD-864
- RD1
- REACH authorisation procedure
- REFSMMAT
- RELIKT-1
- REM Sleep Behavior Disorder Screening Questionnaire
- REM Sleep Behavior Disorder Single-Question Screen
- REM rebound
- REMUS (AUV)
- RESPOND
- RETALT
- RETScreen
- REX (New Horizons)
- RH1750
- RHPPC
- RIK-210
- RIM-161 Standard Missile 3
- RIMFAX
- RIMPUFF
- RINEX
- RISAT
- RISAT-1
- RISAT-1A
- RISAT-2
- RISAT-2B
- RISAT-2BR1
- RISE project
- RIVPACS
- RKA Mission Control Center
- RKO Proctor's Theater, New Rochelle
- RLV Technology Demonstration Programme
- RLV-TD
- RM-81 Agena
- RM-86 Exos
- RM-89 Blue Scout I
- RM-90 Blue Scout II
- RNS formalism
- ROBUSTA
- ROBUSTA-1B
- ROI PAC
- ROKETSAN
- ROSAT
- ROSE (compiler framework)
- ROXs 42Bb
- RR Caeli
- RR Centauri
- RR Coronae Borealis
- RR Lyrae
- RR Lyrae variable
- RR Pictoris
- RR Telescopii
- RR Ursae Minoris
- RRAT J1819-1458
- RRS James Clark Ross
- RRS John Biscoe (1956)
- RS Canum Venaticorum
- RS Canum Venaticorum variable
- RS Coronae Borealis
- RS Ophiuchi
- RS Persei
- RS Puppis
- RS RocketShip
- RS Telescopii
- RS-24 Yars
- RS-25
- RS-26 Rubezh
- RS-27
- RS-28 Sarmat
- RSGC1
- RSGC1-F01
- RSGC1-F02
- RSGC3
- RSM-56 Bulava
- RST model
- RT Andromedae
- RT Aurigae
- RT Carinae
- RT Normae
- RT Trianguli Australis
- RT-1
- RT-2
- RT-20P
- RT-21 Temp 2S
- RT-23 Molodets
- RT-2PM Topol
- RT-2PM2 Topol-M
- RT-64
- RT-70
- RTMC Astronomy Expo
- RTT-150
- RTTOV (radiative transfer code)
- RTV-A-2 Hiroc
- RTV-G-4 Bumper
- RTX Red Rock
- RTX2010
- RU Camelopardalis
- RU Lupi
- RU Ursae Minoris
- RUM Planetarium
- RV Andromedae
- RV Caeli
- RV Corvi
- RV Mirai
- RV Rachel Carson (2008)
- RV Rachel Carson (2017)
- RV Tauri
- RW Cephei
- RW Cygni
- RW Ursae Minoris
- RX Andromedae
- RX J0720.4−3125
- RX J0806.3+1527
- RX J0822−4300
- RX J0852.0−4622
- RX J1131-1231
- RX J1242−11
- RX J1347.5−1145
- RX J1856.5−3754
- RX Leporis
- RX Telescopii
- RX-250-LPN
- RXC J2211.7-0350
- RY Sagittarii
- RZ Gruis
- RZ Normae
- RZ Piscium
- RZ Pyxidis
- Ra
- Ra Patera
- RaInCube
- Raavana 1
- Rabat Observatory
- Rabbi Levi (crater)
- Rabbit (zodiac)
- Rabbit in the Moon
- Rabbits and hares in art
- Rabe (crater)
- Rabies
- Racah (crater)
- Racah parameter
- Race Mathews
- Race Through New York Starring Jimmy Fallon
- Race for the Galaxy
- Race for the Prize
- Race to Mars
- Race to Space
- Rachael Padman
- Rachel Binx
- Rachel Bloom
- Rachel Lomax
- Rachel Mandelbaum
- Rachel Webster
- Rachel Zimmerman
- Rachmaninoff (crater)
- RadExPro seismic software
- Radar
- Radar Fence Transponder
- Radar MASINT
- Radar Men from the Moon
- Radar astronomy
- Radar for Europa Assessment and Sounding: Ocean to Near-surface
- Radarsat-1
- Radarsat-2
- Radau (crater)
- Radcliffe Observatory
- Radcliffe wave
- Radek Zelenka
- Raden Saleh (crater)
- Radial polarization
- Radial trajectory
- Radial velocity
- Radiance
- Radiant (meteor shower)
- Radiant AI
- Radiant Earth Foundation
- Radiant energy
- Radiant energy density
- Radiant exitance
- Radiant exposure
- Radiant flux
- Radiant intensity
- Radiata Plateau
- Radiate crown
- Radiation Budget Instrument
- Radiation Safety Information Computational Center
- Radiation assessment detector
- Radiation burn
- Radiation hardening
- Radiation pressure
- Radiation zone
- Radiative cooling
- Radiative forcing
- Radiative levitation
- Radiative transfer
- Radical (chemistry)
- Radio Astronomy Laboratory
- Radio Aurora Explorer
- Radio City Music Hall
- Radio Galaxy Zoo
- Radio Ice Cherenkov Experiment
- Radio Navigational Aids
- Radio Solar Telescope Network
- Radio Technical Commission for Aeronautics
- Radio acoustic ranging
- Radio acoustic sounding system
- Radio astronomy
- Radio atmospheric
- Radio direction finder
- Radio galaxy
- Radio halo
- Radio object with continuous optical spectrum
- Radio occultation
- Radio quiet zone
- Radio relics
- Radio science subsystem
- Radio silence
- Radio spectrum pollution
- Radio spectrum scope
- Radio star
- Radio telescope
- Radio-quiet neutron star
- Radioactive contamination
- Radiobiology evidence for protons and HZE nuclei
- Radiofrequency Echographic Multi Spectrometry
- Radioglaciology
- Radioisotope heater unit
- Radioisotope thermoelectric generator
- Radiometer
- Radiometer Assessment using Vertically Aligned Nanotubes
- Radiometric calibration
- Radiometry
- Radiophysical Research Institute
- Radioresistance
- Radiosity (radiometry)
- Radiosonde
- Radiotrophic fungus
- Raditladi Basin
- Raditladi quadrangle
- Radu Bălescu
- Raet
- Raet-Tawy
- Rafael Antonio Curra
- Rafael Ferrando
- Rafael Marín
- Rafael Pacheco
- Rafael Rebolo López
- Rafael Suvanto
- Raffaella Morganti
- Raffaello MPLM
- Raffaello Magiotti
- Raft (novel)
- Ragamuffin parade
- Ragbir Bhathal
- Raggedy Ann and Andy in The Pumpkin Who Couldn't Smile
- Raghunathan Srianand
- Ragnar Furuhjelm
- Ragozinka crater
- Rahal Letterman Lanigan Racing
- Rahe (crater)
- Rahu
- Rahukaalam
- Rahway Valles
- Raijin-2
- Raiko
- RailRider
- RailSAR
- Railgun
- Railway time
- Raimond (crater)
- Rain shadow
- Rain-out model
- Rainbow
- Rainbow Mars
- Rainbow gravity theory
- Rainbow-1
- Rainer K. Sachs
- Rainer Mauersberger
- Rainer Spurzem
- Rainer Weiss
- Raineyella antarctica
- Rainfall simulator
- Rainwater Observatory and Planetarium
- Raised beach
- Raised by Wolves (American TV series)
- Raised shoreline
- Raised-bed gardening
- Raised-relief map
- Raising Steam
- Raj Koothrappali
- Raja Chari
- Raja yoga (Hindu astrology)
- Rajah scops owl
- Rajaram Nityananda
- Rajlich's hypothesis
- Rakesh Sharma
- Ralava Beboarimisa
- Raleigh Club
- Ralf Klessen
- Ralf Vandebergh
- Ralph (New Horizons)
- Ralph Abernathy
- Ralph Alger Bagnold
- Ralph Allan Sampson
- Ralph Arthur Penrhyn Clements
- Ralph Asher Alpher
- Ralph Belknap Baldwin
- Ralph Breaks the Internet
- Ralph Champneys Williams
- Ralph Elmer Wilson
- Ralph Lorenz
- Ralph McQuarrie
- Ralph René
- Ralphi Rosario
- Ralphie (satellite)
- Ram Jam Inn
- Ram accelerator
- Ram-Man
- Rama (video game)
- Rama Revealed
- Ramajendas
- Raman (crater)
- Raman Laser Spectrometer
- Raman Prinja
- Raman Science Centre
- Raman Tool Set
- Raman optical activity
- Raman spectroelectrochemistry
- Raman spectroscopy
- Ramazzottius
- Rameau (crater)
- Ramesh Narayan (astrophysicist)
- Ramesside star clocks
- Ramgarh crater
- Ramon Lugo III
- Ramon Margalef
- Ramon Margalef Prize in Ecology
- Ramond–Ramond field
- Ramotholo Sefako
- Rampart crater
- Ramsar site
- Ramsay (crater)
- Ramsden (crater)
- Ramsey interferometry
- Ramsgate Maritime Museum
- Ramus Pomifer
- Ramón Bravo
- Ramón Margalef Award for Excellence in Education
- Ramón María Aller Ulloa
- Rana Fine
- Randall–Sundrum model
- Randecker Maar
- Randii Wessen
- Randkluft
- Randolph Bresnik
- Randy Bettis
- Randy Gardner (record holder)
- Randy Post
- Randy VanWarmer
- Range (geographic)
- Range rate
- Range state
- Ranger 1
- Ranger 2
- Ranger 3
- Ranger 4
- Ranger 5
- Ranger 6
- Ranger 7
- Ranger 8
- Ranger 9
- Ranger program
- Rangi Mātāmua
- Rangi and Papa
- Rangifer (constellation)
- Ranjan Roy Daniel
- Rank abundance curve
- Rankers
- Rankine (crater)
- Ranna an aeir
- Rao (comics)
- Rape and revenge film
- Raped by an Angel
- Raped by an Angel 2: The Uniform Fan
- Rapha (gamer)
- Raphael (crater)
- Raphael Bousso
- Raphael Levi Hannover
- Raphael's Ephemeris
- Rapid Acquisition Imaging Spectrograph Experiment
- Rapid Attack Identification Detection Reporting System
- Rapid Climate Change-Meridional Overturning Circulation and Heatflux Array
- Rapid Eye Mount telescope
- Rapid eye movement sleep
- Rapid eye movement sleep behavior disorder
- RapidEye
- Rapidly Attachable Fluid Transfer Interface
- Rapidly oscillating Ap star
- Rapoport's rule
- Rapture dream
- Rare Earth (book)
- Rare Earth hypothesis
- Rare biosphere
- Rarobacteraceae
- Rasad 1
- Rashad Nabiyev
- Rashid (lunar rover)
- Rashid Sunyaev
- Rashmi (Hindu astrology)
- Raspletin (crater)
- Rasputitsa
- Rassvet (ISS module)
- Raster Navigational Charts (NOAA)
- Rat (zodiac)
- Rat Creek
- Ratchet & Clank
- Ratchet & Clank (2002 video game)
- Ratchet & Clank (2016 video game)
- Ratchet & Clank (film)
- Ratchet & Clank Collection
- Ratchet & Clank Future: A Crack in Time
- Ratchet & Clank Future: Quest for Booty
- Ratchet & Clank Future: Tools of Destruction
- Ratchet & Clank: All 4 One
- Ratchet & Clank: Full Frontal Assault
- Ratchet & Clank: Going Commando
- Ratchet & Clank: Going Mobile
- Ratchet & Clank: Into the Nexus
- Ratchet & Clank: Rift Apart
- Ratchet & Clank: Size Matters
- Ratchet & Clank: Up Your Arsenal
- Ratchet (Ratchet & Clank)
- Ratchet: Deadlocked
- Rate gyro
- Rathayibacter
- Rathayibacter tritici
- Rather Be (The Verve song)
- Rating curve
- Rational polynomial coefficient
- Ratko Janev
- Ratman
- Ratri
- Ratsat
- Rauk
- Raul Jimenez Tellado
- Raumpatrouille – Die phantastischen Abenteuer des Raumschiffes Orion
- Rauni-Leena Luukanen-Kilde
- Rausser College of Natural Resources
- Rautavaara's Case
- Rave
- Ravel (crater)
- Raven Industries
- Raven Inn, Battersea
- Raven Tales
- Ravi Vallis
- Ravish Malhotra
- Ravit Helled
- Ravn virus
- Raw Reality with Gail Kasper
- Rawtekk
- Ray Bradbury
- Ray Ison
- Ray Jayawardhana
- Ray Keith
- Ray McFall
- Ray Nelson
- Ray Norris (astrophysicist)
- Ray Sparenberg
- Ray Weymann
- Ray Wheeler
- Ray system
- Raychaudhuri equation
- Raye Kass
- Rayet (crater)
- Rayleigh (Martian crater)
- Rayleigh (lunar crater)
- Rayleigh fractionation
- Rayleigh interferometer
- Rayleigh sky model
- Rayleigh–Bénard convection
- Rayleigh–Gans approximation
- Rayleigh–Taylor instability
- Rayman
- Rayman (video game)
- Rayman 2: The Great Escape
- Rayman 3: Hoodlum Havoc
- Rayman Brain Games
- Rayman Designer
- Rayman Legends
- Rayman M
- Rayman Origins
- Rayman Raving Rabbids
- Rayman Raving Rabbids (handheld game)
- Rayman Raving Rabbids 2
- Rayman Raving Rabbids: TV Party
- Rayman: Hoodlums' Revenge
- Rayman: The Animated Series
- Raymarine Marine Electronics
- Raymix
- Raymond A. Palmer
- Raymond Adam Kline
- Raymond Augustin Mailhat
- Raymond Butt
- Raymond C. Moore Medal
- Raymond E. Fowler
- Raymond Effect
- Raymond Heacock
- Raymond J. Healy
- Raymond Jeanloz
- Raymond Lee Newcomb
- Raymond M. Patterson
- Raymond McLenaghan
- Raymond Smith Dugan
- Rayner orogeny
- Rayners, Rayners Lane
- Rayya (crater)
- Raza Longknife
- RazakSAT
- Razdow Telescope
- Raze (film)
- Razerpak
- Razumov (crater)
- Raël
- Re-Animator
- Re-Wired (song)
- ReCore
- Reach (geography)
- Reach for the Stars (video game)
- Reach for the Stars (will.i.am song)
- Reaction Engines A2
- Reaction Engines Limited
- Reaction Fireworks
- Reaction Research Society
- Reaction control system
- Reaction wheel
- Reactionless drive
- Reactive nitrogen
- Reactive-ion etching
- Reactor Experiment for Neutrino Oscillation
- Reading Public Museum
- Ready Jet Go!
- Real Instituto y Observatorio de la Armada
- Real Men (film)
- Real gas
- Real-time Neutron Monitor Database
- Real-time kinematic
- RealSky
- Reality Checkpoint
- RealityCapture
- Realm of Chaos (album)
- Reaper Man
- Reapers (Mass Effect)
- Reapers (song)
- Reason Is Treason
- Reassembly (video game)
- Rebecca Elson
- Rebekah Dawson
- Rebel (train)
- Rebel Alliance
- Rebel Galaxy
- Rebel Galaxy Outlaw
- Rebel Girl (Angels & Airwaves song)
- Rebel Moon Rising
- Rebel Without a Cause
- Reber Radio Telescope
- Reboost
- Rebreather
- Receiver autonomous integrity monitoring
- Reception (astrology)
- Recessional velocity
- Recht (crater)
- Reciprocal lattice
- Reciprocity (photography)
- Recoil (2011 film)
- Recombination (cosmology)
- Recon (app)
- Reconnaissance satellite
- Rectangulus
- Recurring dream
- Recursive islands and lakes
- Red Annihilation
- Red Arrow (PRR train)
- Red Arrow (Russian train)
- Red Barn Observatory
- Red Bull Stratos
- Red Buttes Observatory
- Red Claw (novel)
- Red Dawn (audio drama)
- Red Dwarf
- Red Dwarf: Back to Earth
- Red Dwarf: Infinity Welcomes Careful Drivers
- Red Dwarf: The Promised Land
- Red Envelope Club
- Red Faction
- Red Faction (video game)
- Red Faction II
- Red Faction: Armageddon
- Red Faction: Guerrilla
- Red Gate Woods
- Red Ghost
- Red Heat (1985 film)
- Red Hen Systems
- Red Lion Inn, Southampton
- Red Lion, Ampney St Peter
- Red Lion, Duke of York Street
- Red Lion, Hillingdon
- Red Lion, Snargate
- Red Lion, Westminster
- Red Moon (novel)
- Red Museum
- Red Owl (retail chain)
- Red Planet (film)
- Red Planet (novel)
- Red Planet Mars
- Red Planet Noir
- Red Queen's race
- Red Rectangle Nebula
- Red Rising
- Red River Fault
- Red Spider Nebula
- Red Square Nebula
- Red Star (novel)
- Red Star, Winter Orbit
- Red Storm Rising
- Red Sun of Darkover
- Red Thunder (novel)
- Red Tornado
- Red Wing crater
- Red clump
- Red dwarf
- Red edge
- Red giant
- Red mud
- Red nugget
- Red rain in Kerala
- Red soil
- Red star
- Red supergiant star
- Red's Dream
- Red-giant branch
- Redd Boggs
- Redd Foxx
- Reddish scops owl
- Redemption Ark
- Redi (crater)
- Rediscovery
- Redline (2009 film)
- Redox
- Redox gradient
- Redoximorphic features
- Redshift
- Redshift (planetarium software)
- Redshift (software)
- Redshift quantization
- Redshift survey
- Redshift-space distortions
- Redshirt (video game)
- Redshirts (novel)
- Redstone (rocket family)
- Redstone Test Stand
- Redtail Telematics Corporation
- Redu Station
- Reduced muscle mass, strength and performance in space
- Reduced-gravity aircraft
- Reducing atmosphere
- Reductive dechlorination
- Reedy Creek Observatory
- Reef
- Reef knoll
- Reefer Madness
- Reentry Breakup Recorder
- Reentry capsule
- Reese Palley
- Reference atmospheric model
- Reference dose
- Reference ellipsoid
- Reflectance
- Reflecting instrument
- Reflecting pool
- Reflecting telescope
- Reflection high-energy electron diffraction
- Reflection nebula
- Reflectometric interference spectroscopy
- Reflector (microsatellite)
- Reform School Girls
- Refracting telescope
- Refractory (planetary science)
- Refugium (population biology)
- Regal Cinema, Uxbridge
- Regeneration (ecology)
- Regenerative Medicine Partnership in Education
- Regenesis (novel)
- Regent Street Cinema
- Reggane
- Regge calculus
- Regiment of the North Pole
- Reginald Crummack
- Reginald Harrison
- Reginald Lawson Waterfield
- Reginald Turnill
- Regiomontanus
- Regiomontanus (crater)
- Region of freshwater influence
- Regional African Satellite Communication Organization
- Regional Atmospheric Modeling System
- Regional Ocean Modeling System
- Regional Planetary Image Facility
- Regional Positioning and Timing System (Turkey)
- Regional Scale Nodes
- Regional Science Policy and Practice
- Regional Snowfall Index
- Regional geology
- Registax
- Registration Convention
- Registration, Evaluation, Authorisation and Restriction of Chemicals
- Regius Professor of Natural History (Aberdeen)
- Regnault (crater)
- Regolith
- Regosol
- Regressive delta
- Regular Show (season 8)
- Regular Show: Mordecai and Rigby in 8-Bit Land
- Regular moon
- Regulus
- Rehbar-I
- Reichenbach (crater)
- Reiden Patera
- Reidite
- Reiki Kushida
- Reimar Lüst
- Reimarus (crater)
- Reimei
- Reindeer distribution
- Reiner (crater)
- Reiner Gamma
- Reinhard Furrer
- Reinhard Genzel
- Reinhard Meinel
- Reinhard Süring Medal
- Reinhardt Adolfo Fuck
- Reinhold (crater)
- Reinhold Ewald
- Reinhold O. Schmidt
- Reinhold Tiling
- Reino Antero Hirvonen
- Reinventing Gravity
- Reionization
- Reissner–Nordström metric
- Relationship between animal ethics and environmental ethics
- Relationship between string theory and quantum field theory
- Relative angular momentum
- Relative dating
- Relative hour
- Relative locality
- Relative sea level
- Relative species abundance
- Relativistic Doppler effect
- Relativistic Lagrangian mechanics
- Relativistic angular momentum
- Relativistic beaming
- Relativistic chaos
- Relativistic disk
- Relativistic images
- Relativistic plasma
- Relativistic rocket
- Relativistic runaway electron avalanche
- Relativistic similarity parameter
- Relativistic star
- Relativity (Star Trek: Voyager)
- Relativity Space
- Relaxation (physics)
- Relay program
- Reliable Replacement Warhead
- Relic abundance
- Relic particles
- Relict
- Relict (biology)
- Relict (geology)
- Relief generation
- Relief ratio
- Religion in space
- Religious interpretations of the Big Bang theory
- Religious views of Isaac Newton
- Remarque (crater)
- Rembrandt (crater)
- Remedios Varo
- Remember a Day
- Remember... Dreams Come True
- Remembrance of Earth's Past
- Remineralisation
- Remnant: From the Ashes
- Remo Ruffini
- Remote Astronomical Society Observatory of New Mexico
- Remote Sensing (journal)
- Remote Sensing Applications Center
- Remote Sensing Center
- Remote Sensing and Photogrammetry Society
- Remote Sensing in Ecology and Conservation
- Remote Sensing of Environment
- Remote Telescope Markup Language
- Remote plasma
- Remote racking system
- Remote sensing
- Remote sensing (archaeology)
- Remote sensing (geology)
- Remote sensing software
- Remote surgery
- RemoteView
- RemoveDEBRIS
- Remus (moon)
- Renaissance (club)
- Renaissance Cinemas
- Renaissance Theatre (Mansfield, Ohio)
- Renal stone formation in space
- Renate Brümmer
- Renaud Barbaras
- Renaudot (crater)
- Rendezvous in Space
- Rendezvous pitch maneuver
- Rendezvous with Rama
- Rendezvous: A Space Shuttle Simulation
- Rendzina
- Rene Carpenter
- Renegade Legion: Interceptor
- Renegade: The Battle for Jacob's Star
- Renewable energy commercialization
- Renga (video game)
- Renner–Teller effect
- Rennes-le-Château
- Renoir (crater)
- Renpet Mons
- Renu Malhotra
- Renunciates of Darkover
- René Dif
- René Laloux
- René Racine
- Renée C. Kraan-Korteweg
- Renée Canavaggia
- Renée Hložek
- Repair Satellite Prototype
- Reports of Streptococcus mitis on the Moon
- Reposal
- Reproductive Health Supplies Coalition
- Repsold (crater)
- Reptilian conspiracy theory
- Repton (1983 video game)
- Reptyl
- Republic of Artsakh
- Repulsive state
- República Cromañón nightclub fire
- Resazurin
- Rescue Agreement
- Rescue Party
- Rescue at Rigel
- Rescue on Fractalus!
- Rescued from Paradise
- Research Consortium On Nearby Stars
- Research Double Module
- Research Institute for Advanced Computer Science
- Research Institute of Computer Science and Random Systems
- Research balloon
- Research in Astronomy and Astrophysics
- Research vessel
- Resen (crater)
- Reservoir
- Reservoir modeling
- Reshmi Mukherjee
- Resident Alien (comics)
- Resident Space Object
- Residual chemical shift anisotropy
- Residual sodium carbonate index
- Residuum (geology)
- Resistance (Star Trek: Voyager)
- Resistance (song)
- Resistive ballooning mode
- Resistojet rocket
- Resistor–transistor logic
- Resnik (crater)
- Resolute Bay
- Resolution (electron density)
- Resolution Rupes
- Resolved sideband cooling
- Resonance Raman spectroscopy
- Resonance fluorescence
- Resonance-enhanced multiphoton ionization
- Resonant column test
- Resonant inelastic X-ray scattering
- Resonant magnetic perturbations
- Resonant trans-Neptunian object
- Resonator mode
- Resort Special
- Resource Prospector (rover)
- Resourcesat-1
- Resourcesat-2
- Resourcesat-2A
- Respighi (crater)
- Resplendent
- Response factor
- Restless legs syndrome
- Restoree
- Restoro d'Arezzo
- Restriction of Hazardous Substances Directive
- Reststrahlen effect
- Resurrection (Star Trek: Deep Space Nine)
- Resurs-DK No.1
- Resurs-P No.1
- Resurs-P No.2
- Reta Beebe
- Retarded position
- Retention basin
- Reticle
- Reticular formation
- Reticulum
- Reticulum II
- Reticulum in Chinese astronomy
- Retinohypothalamic tract
- Retisol
- Retreat of glaciers since 1850
- Retro (DJ)
- RetroArch
- Retrofitting
- Retroflect
- Retrogradation
- Retrograde and prograde motion
- Retrorocket
- Return flow
- Return from Orbit
- Return from the Stars
- Return of Apollo 15 to Earth
- Return of the Bastards
- Return of the Jedi (novel)
- Return of the Living Dead: Rave to the Grave
- Return period
- Return to Grace
- Return to Mars
- Return to Rocheworld
- Return to the Lost Planet
- Returnal (video game)
- Reull Vallis
- Reusable Booster System
- Reusable Vehicle Testing
- Reusable launch system
- Reusable spacecraft
- Reusch Medal
- Reusch's Moraine
- Reuven Ramaty
- Reuven Ramaty High Energy Solar Spectroscopic Imager
- Reuverian
- Reuyl (crater)
- Reva Williams
- Revati (nakshatra)
- Revegetation
- Revelation 12 sign prophecy
- Revelation 22
- Revelation Space
- Revelation Space universe
- Revelations of the Dark Mother
- Revenge (nightclub)
- Revenge of the Mysterons from Mars
- Revenger
- Reverberation mapping
- Reverse learning
- Reverse weathering
- Reversed field pinch
- Reversed-Field eXperiment
- Reviews in Mineralogy and Geochemistry
- Reviews of Geophysics
- Revista Mexicana de Astronomía y Astrofísica
- Revista Mexicana de Ciencias Geológicas
- Revista de la Asociación Geológica Argentina
- Revival house
- Revolt (song)
- Revolt on Alpha C
- Revolution (IDW Publishing)
- Revolution Bars Group
- Revolving rivers
- Revue Cinema
- Rex Geveden
- Rex J. Walheim
- Rex Nemorensis
- Rey (Star Wars)
- Reye syndrome
- Reynolds (crater)
- Reynolds Layer
- Reysa Bernson
- Reza Moradi Ghiasabadi
- Rhaeticus (crater)
- Rhea (moon)
- Rhea (mythology)
- Rhea Woltman
- Rheasilvia
- Rheid
- Rhein in Flammen
- Rheinmetall KZO
- Rheita (crater)
- Rhesus macaque
- Rhinolophoidea
- Rhinonycteridae
- Rhizobia
- Rhizobiales
- Rhizophagus irregularis
- Rhizosphere
- Rhizotron
- Rho Andromedae
- Rho Aquarii
- Rho Aquilae
- Rho Arae
- Rho Arietis
- Rho Aurigae
- Rho Boötis
- Rho Cancri
- Rho Capricorni
- Rho Cassiopeiae
- Rho Centauri
- Rho Cephei
- Rho Ceti
- Rho Coronae Borealis
- Rho Cygni
- Rho Draconis
- Rho Eridani
- Rho Geminorum
- Rho Gruis
- Rho Herculis
- Rho Hydrae
- Rho Indi
- Rho Indi b
- Rho Leonis
- Rho Lupi
- Rho Ophiuchi
- Rho Ophiuchi cloud complex
- Rho Orionis
- Rho Pavonis
- Rho Pegasi
- Rho Persei
- Rho Phoenicis
- Rho Piscium
- Rho Puppis
- Rho Sagittarii
- Rho Scorpii
- Rho Serpentis
- Rho Tauri
- Rho Telescopii
- Rho Tucanae
- Rho Ursae Majoris
- Rho Virginis
- Rho1 Arae
- Rho1 Arietis
- Rho1 Cephei
- Rho1 Eridani
- Rho1 Sagittarii
- Rho2 Arae
- Rho2 Arietis
- Rho2 Cancri
- Rho2 Cephei
- Rho2 Eridani
- Rho2 Sagittarii
- Rho3 Arietis
- Rho3 Eridani
- Rhodococcus rhodochrous
- Rhonda Stroud
- Rhumb line
- Rhumbline network
- Rhyodacite
- Rhyolite
- Rhysling (crater)
- Riachão Ring
- Rialto Square Theatre
- Rialto Theatre (Montreal)
- Rialto Theatre (New York City)
- Rialto Theatre (South Pasadena, California)
- Rian Johnson
- Riazuddin (physicist)
- Ribhus
- Ribu
- Riccardo Giacconi
- Riccardo Giovanelli
- Ricci scalars (Newman–Penrose formalism)
- Riccioli (crater)
- Riccius (crater)
- Ricco (crater)
- Rich Koz
- Richard A. Lupoff
- Richard A. Searfoss
- Richard Alfred Rossiter
- Richard Arnowitt
- Richard Assmann
- Richard B. Dunn Solar Telescope
- Richard B. Hoover
- Richard Battin
- Richard Battye
- Richard Blome
- Richard Branson
- Richard Bryan
- Richard C. Lamb
- Richard C. Lord
- Richard C. Tolman
- Richard Chwedyk
- Richard Clifton-Dey
- Richard Corben
- Richard D. Lines
- Richard Damen
- Richard Davis (astronomer)
- Richard Dean Starr
- Richard Delap
- Richard Dowden (scientist)
- Richard Dunthorne
- Richard E. Berendzen
- Richard E. Cunha
- Richard E. Geis
- Richard E. Gray
- Richard E. Keating
- Richard Edwin Hills
- Richard Ellis (astronomer)
- Richard F. Gordon Jr.
- Richard Ferber
- Richard Feynman
- Richard Fleischer
- Richard G. Smith (engineer)
- Richard Garriott
- Richard Goldstein (astronomer)
- Richard Green (astronomer)
- Richard H. Emmons
- Richard H. Hall
- Richard H. Truly
- Richard Harrison (scientist)
- Richard Hawley Tucker
- Richard Hieb
- Richard Holdaway
- Richard Hollingshead
- Richard Hunstead
- Richard Huziak
- Richard Inwards
- Richard J. C. Atkinson
- Richard J. Saykally
- Richard J. Terrile
- Richard Kelly (director)
- Richard Kingsford (ecologist)
- Richard Klein (astronomer)
- Richard Kowalski
- Richard Laws
- Richard Lingenfelter
- Richard M. Linnehan
- Richard M. Powers
- Richard Marquand
- Richard Martin West
- Richard Massey
- Richard Mastracchio
- Richard McCray
- Richard McLean Badger
- Richard N. Richards
- Richard O. Covey
- Richard P. Binzel
- Richard P.A.C. Newman
- Richard Peckover
- Richard Pickersgill
- Richard Prager
- Richard Q. Twiss
- Richard R. Arnold
- Richard R. Ernst
- Richard R. Fisher
- Richard Reynolds (chemist)
- Richard Rhodes (police commissioner)
- Richard Rhodes (sculptor)
- Richard Russell Waldron
- Richard Scheuring
- Richard Schorr
- Richard Scott Perkin
- Richard Shaw Brown
- Richard Sher (producer)
- Richard Smalley
- Richard Smart (actor)
- Richard Stallman
- Richard Swinburne
- Richard T. Whitcomb
- Richard Tousey
- Richard Towneley
- Richard Tucholka
- Richard Varvill
- Richard Vission
- Richard Wilson (author)
- Richard Woolsey
- Richard Zare
- Richard of Wallingford
- Richard the Stork
- Richarda Morrow-Tait
- Richards (lunar crater)
- Richards equation
- Richardson (Martian crater)
- Richardson (lunar crater)
- Richardson number
- Richardton meteorite
- Richat Structure
- Richie Kaczor
- Richie Kidd
- Richie Rich (designer)
- Richmond Night Market
- Richmond William Hullett
- Richtmyer–Meshkov instability
- Ricinus vaderi
- Rick Abramson
- Rick Berry (artist)
- Rick Husband
- Rick Klaw
- Rick Squillante
- Rick Sternbach
- Rick Tumlinson
- Rick and Morty
- Rick and Morty: Virtual Rick-ality
- Ricky Ricotta's Mighty Robot (series)
- Riddick (film)
- Ride Report
- Rider at the Gate
- Rider's British Merlin
- Ridge A
- Ridge and swale
- Ridge-and-Valley Appalachians
- Riding Rockets
- Ridley (Metroid)
- Ridley Scott
- Riedel (crater)
- Riemann (crater)
- Riemannian Penrose inequality
- Riemenschneider (crater)
- Riesending cave rescue
- Rieskrater Museum
- Rietveld refinement
- Riffle
- Riffle-pool sequence
- RiftSpace
- Rigel
- Rigel (rocket)
- Rigel in fiction
- Rigel's Revenge
- Right ascension
- Riley (crater)
- Riley Martin
- Rilke (crater)
- Rill
- Rille
- Rim (crater)
- Rim Turkmani
- Rim of the World
- Rima Brayley
- Rima Sharp
- Rima Zahia
- Rimae Aristarchus
- Rimae Fresnel
- Rimae Secchi
- Rimae Sirsalis
- Rimantas Stankevičius
- Rimmerworld
- Rincon 1
- Ring (Baxter novel)
- Ring Nebula
- Ring Nebula (NGC 6822)
- Ring current
- Ring galaxy
- Ring laser gyroscope
- Ring mold crater
- Ring of Brodgar
- Ring of Fire
- Ring singularity
- Ring system
- Ringer (comics)
- Ringing the bull
- Rings of Chariklo
- Rings of Jupiter
- Rings of Neptune
- Rings of Rhea
- Rings of Saturn
- Rings of Uranus
- Ringworld
- Rio Grande Zephyr
- Rio Theatre
- Rio Tinto Alcan Planetarium
- Riometer
- Rip Van Winkle
- Rip current
- Rip tide
- Rip-up clasts
- Riparian buffer
- Riparian zone
- Ripley (crater)
- Ripple tank
- Risa Wechsler
- Rise (Star Trek: Voyager)
- Rise of the Continents
- Rise of the Guardians
- Rising Sun, Carter Lane
- Rising Sun, Cloth Fair
- Rising Sun, Fitzrovia
- Rising Sun, Mill Hill
- Risk of Rain
- Ristar
- Ristar (Game Gear)
- Rita M. Sambruna
- Rita Rapp
- Rita Winkler
- Ritan (Beijing)
- Ritchey (Martian crater)
- Ritchey (lunar crater)
- Ritchey–Chrétien telescope
- Ritland crater
- Riton (musician)
- Rittenhouse (crater)
- Rittenhouse Medal
- Ritter (crater)
- Ritter Observatory
- Ritu (Indian season)
- Ritu Karidhal
- Ritual washing in Judaism
- Ritz (crater)
- Ritz Theatre (Jacksonville)
- Rivals (Star Trek: Deep Space Nine)
- River
- River Sidon
- River Solent
- River Styles Framework
- River Tigris (constellation)
- River bank erosion along the Ganges in Malda and Murshidabad districts
- River bank failure
- River barrier hypothesis
- River bifurcation
- River channel migration
- River delta
- River incision
- River island
- River mile
- River morphology
- River of Gods
- River regime
- River rejuvenation
- River terraces (tectonic–climatic interaction)
- Rivera (crater)
- Riverfront Park (Spokane, Washington)
- Rivero's barn owl
- Riverscape
- Riverview Hotel, Balmain
- Riverworld
- Riviera Theatre
- Rivoli Beaubourg cinema bombing
- Rizal (crater)
- Road to the Stars
- Road with Cypress and Star
- Roadside Picnic
- Roadway air dispersion modeling
- Roaldite
- Roaring Forties
- Rob King
- Rob Latham
- Rob Marshall
- Rob Meyerson
- Rob Strain
- Rob Thomas (scientist)
- Rob Zombie
- Rob da Bank
- Robb Kulin
- Robbie Hood
- Robbie Rivera
- Robbie Vorhaus
- Robe
- Roberson Museum and Science Center
- Robert (crater)
- Robert A. Haag
- Robert A. Parker
- Robert A. Rushworth
- Robert A. W. Lowndes
- Robert A. Wittenmyer
- Robert Adolf Naef
- Robert Alfred Cloyne Godwin-Austen
- Robert Andrews Millikan
- Robert Arthur Williams
- Robert Ashington Bullen
- Robert Asprin
- Robert Aubinière
- Robert B. Leighton
- Robert Bernays
- Robert Bigelow
- Robert Bindschadler
- Robert Bingham (glaciologist)
- Robert Bloch
- Robert Boyd (physicist)
- Robert Brownlee Observatory
- Robert Bunsen
- Robert Burnham Jr.
- Robert C. Duncan (astrophysicist)
- Robert C. Springer
- Robert Cecil Hayes
- Robert Clivillés
- Robert Coulson
- Robert Crippen
- Robert Curbeam
- Robert Curl
- Robert Curry Cameron
- Robert D. Braun
- Robert D. Cabana
- Robert D. Mathieu
- Robert D. Stephens
- Robert Dean (ufologist)
- Robert Duce
- Robert E. Bourdeau
- Robert E. Cox
- Robert E. Huffman
- Robert E. Sheriff
- Robert E. Vardeman
- Robert Eli Hooppell
- Robert Emden
- Robert Esnault-Pelterie
- Robert Evans (astronomer)
- Robert F. Christy
- Robert F. Overmyer
- Robert Falla
- Robert FitzRoy
- Robert Fletcher (priest)
- Robert Fosbury
- Robert Friend (pilot)
- Robert Frodeman
- Robert G. Greenler
- Robert Gendler
- Robert George Harrington
- Robert Geroch
- Robert Gilman
- Robert Grant Aitken
- Robert Gray (sea captain)
- Robert Grosseteste
- Robert H. Dicke
- Robert H. Goddard
- Robert H. Gray
- Robert H. MacArthur Award
- Robert H. McNaught
- Robert Hamer
- Robert Hanbury Brown
- Robert Hazen
- Robert Henry Lawrence Jr.
- Robert Herman
- Robert Hines (astronaut)
- Robert Holford Macdowall Bosanquet
- Robert Hood
- Robert Horace Baker
- Robert J. Cenker
- Robert J. Goldston
- Robert J. Nemiroff
- Robert J. Parks
- Robert J. Sawyer
- Robert J. Thacker
- Robert J. Trumpler Award
- Robert Jacklyn
- Robert Jackson (astronomer)
- Robert James (headmaster)
- Robert Jastrow
- Robert Julius Trumpler
- Robert Kennicutt
- Robert Kirshner
- Robert Kraft (astronomer)
- Robert L. Gibson
- Robert L. J. Ellery
- Robert L. Lippert
- Robert L. Sack
- Robert L. Stewart
- Robert Lawlor
- Robert Linderholm
- Robert Lusser
- Robert Luther
- Robert Marsland Groves
- Robert McCall (artist)
- Robert McCarley
- Robert McMahan
- Robert Methven Petrie
- Robert Meyer Burnett
- Robert Michael White
- Robert Monroe
- Robert P. Madden
- Robert P. Mills
- Robert P. Sharp
- Robert Pearlman
- Robert Quimby
- Robert R. Gilruth
- Robert R. L. Guillard
- Robert Racic
- Robert Ratcliff
- Robert Raynolds McMath
- Robert Rosner
- Robert Rudmose-Brown
- Robert Rumsey Webb
- Robert Russell Newton
- Robert S. Kraemer
- Robert S. McMillan (astronomer)
- Robert S. Richardson
- Robert Satcher
- Robert Scholes
- Robert Schommer
- Robert Sharp (crater)
- Robert Sheaffer
- Robert Silverberg
- Robert Simmon
- Robert Simpson (composer)
- Robert Simpson Woodward
- Robert Stawell Ball
- Robert Stickgold
- Robert Sutton Harrington
- Robert T. A. Innes
- Robert Thirsk
- Robert Thomas Jones (engineer)
- Robert Todd Lincoln
- Robert Truax
- Robert W. Cobb
- Robert W. Farquhar
- Robert W. Field
- Robert Wald
- Robert Warden Lee
- Robert Weber (astronomer)
- Robert Weryk
- Robert William Cole
- Robert Wilson (astronomer)
- Robert Wise
- Robert Woodrow Wilson
- Robert Yerburgh
- Robert Zemeckis
- Robert Zubrin
- Robert d'Escourt Atkinson
- Robert de Boron
- Robert of Ketton
- Robert von Sterneck
- Robert's Quartet
- Robert-Aglaé Cauchoix
- Roberta Bondar
- Roberta Farrell
- Roberta M. Humphreys
- Roberta Sherwood
- Roberto Abraham
- Roberto Torretti
- Roberto Vittori
- Roberts (crater)
- Robertson (crater)
- Robertson Karoo
- Robertus Anglicus
- Robeson Planetarium and Science Center
- Robin Bell (scientist)
- Robin Canup
- Robin Clark (chemist)
- Robin Henderson
- Robin Hood's Ball
- Robin M. Hochstrasser
- Robin Williams
- Robins (talk show)
- Robinson (crater)
- Robinson Crusoe on Mars
- Robinson's Requiem
- Robinson: The Journey
- RoboNet
- Robonaut
- Robot Chicken
- Robotic Lunar Observatory
- Robotic Optical Transient Search Experiment
- Robotic Refueling Mission
- Robotic mapping
- Robotic spacecraft
- Robotic telescope
- Roboto (character)
- Robotrix
- Robowarrior
- Robur Carolinum
- Robust associations of massive baryonic objects
- Robyn Millan
- Rocannon's World
- Rocas Verdes ophiolites
- Rocca (crater)
- Rocco Petrone
- Roche (crater)
- Roche limit
- Roche lobe
- Rochechouart crater
- Rocheworld
- Rochon prism
- Rock (geology)
- Rock Abrasion Tool
- Rock Bridge High School
- Rock Elm Disturbance
- Rock Flat Mine
- Rock Flat Placer
- Rock Wars
- Rock analogs for structural geology
- Rock cannon
- Rock cycle
- Rock flour
- Rock glacier
- Rock mass classification
- Rock n' Roll Racing
- Rock veneer
- Rock-cut architecture
- Rockair
- Rocker-bogie
- Rocket
- Rocket (firework)
- Rocket Arena (mod)
- Rocket Attack U.S.A.
- Rocket City Space Pioneers
- Rocket Festival
- Rocket Girls
- Rocket Jets
- Rocket Jockey (novel)
- Rocket Lab
- Rocket Lab Launch Complex 1
- Rocket Madsen Space Lab
- Rocket Man (song)
- Rocket Men
- Rocket Propulsion Establishment
- Rocket Raccoon
- Rocket Racing League
- Rocket Robin Hood
- Rocket Rods
- Rocket Science (miniseries)
- Rocket Ship Galileo
- Rocket candy
- Rocket garden
- Rocket propellant
- Rocket sled launch
- Rocket to Limbo
- Rocket to Luna
- Rocket to Uranus
- Rocket turbine engine
- Rocket's Red Glare
- Rocket-based combined cycle
- RocketMan
- RocketMotorTwo
- RocketShip Tours
- Rocketdyne J-2
- Rocketmen
- Rocketmen (film)
- Rocketplane Global Inc.
- Rocketplane Kistler
- Rocketplane Limited, Inc.
- Rocketplane XP
- Rocketry SA
- Rockets by Astra
- Rocketship X-M
- Rocknest (Mars)
- Rocknest 3
- Rockoon
- Rockwatch
- Rockwell X-30
- Rocky Jones, Space Ranger
- Rocky Mountain Rocket
- Rocky Sullivan's
- Rod (optical phenomenon)
- Rod Brown of the Rocket Rangers
- Rod Davies
- Rod and frame test
- Rodan
- Roddenberry (crater)
- Rodent Research Hardware System
- Rodger Doxsey
- Rodin (crater)
- Rodingite
- Rodney Marks
- Rodney Matthews
- Rodney McKay
- Rodolfo Damaggio
- Rodolfo Hinostroza
- Rodolfo Neri Vela
- Rodolphe Radau
- Rodolphe Salis
- Roebling Medal
- Roerich (crater)
- Roerichism
- Rog Peyton
- Rogel Mari Sese
- Rogelio Bernal Andreo
- Roger Agache
- Roger Angel
- Roger B. Chaffee
- Roger B. Chaffee Planetarium
- Roger Bacon
- Roger Blandford
- Roger Boisjoly
- Roger Carmichael Robert Owen
- Roger Chevalier
- Roger Clifton Jennison
- Roger Corman
- Roger D. Launius
- Roger Davies (astrophysicist)
- Roger Donaldson
- Roger Ebert
- Roger Ekirch
- Roger Elwood
- Roger Everett Summons
- Roger Goode
- Roger Griffin (astronomer)
- Roger Hane
- Roger J. Phillips
- Roger K. Crouch
- Roger L. Easton
- Roger Leir
- Roger Lhermitte
- Roger Penrose
- Roger Putnam
- Roger Revelle Prize
- Roger Sanchez
- Roger Shah
- Roger Tayler
- Roger Williams Park Museum of Natural History and Planetarium
- Roger Zwieg
- Roger of Hereford
- Rogers Commission Report
- Rogers Observatory
- Rogier Windhorst
- Rogue Galaxy
- Rogue Moon
- Rogue Planet (Star Trek: Enterprise)
- Rogue Planet (novel)
- Rogue Queen
- Rogue Trip: Vacation 2012
- Rogue Trooper (video game)
- Rogue planet
- Rogue wave
- Rogues' Regiment
- Rohini (goddess)
- Rohini (rocket family)
- Rohini (satellite)
- Roketsan Research Center
- Rokusei Senjutsu
- Roland Clark
- Roland Emmerich
- Roland J. Green
- Rolf Brahde
- Roll Out Solar Array
- Roll program
- Roller dam
- Rolling Thunder (film)
- Rolling ball argument
- Rolls-Royce Baby
- Rolnick Observatory
- Rom: Dire Wraiths
- Romaka Siddhanta
- Roman Glazman
- Roman Juszkiewicz
- Roman Romanenko
- Roman Ulrich Sexl
- Roman calendar
- Roman candle (firework)
- Roman ring
- Romanian Space Agency
- Romano's Star
- Romas Kukalis
- Romashka reactor
- Rome Observatory
- Rome2rio
- Romer
- Romer-Simpson Medal
- Romulus (moon)
- Romy Haag
- Ron Carlisle
- Ron Carroll
- Ron Dittemore
- Ron Giovanelli
- Ron Hardy
- Ron Miller (artist and author)
- Ron Sweed
- Ron Trent
- Ron Walotsky
- Rona Ramon
- Ronald Alexander McIntosh
- Ronald C. Davidson
- Ronald Drever
- Ronald E. Cohen
- Ronald Ekers
- Ronald Evans (astronaut)
- Ronald G. Amundson
- Ronald Greeley
- Ronald Gustave Kellett
- Ronald J. Garan Jr.
- Ronald J. Grabe
- Ronald Kantowski
- Ronald Lancaster (chemist)
- Ronald M. Sega
- Ronald Mallett
- Ronald McNair
- Ronald N. Bracewell
- Ronald Parise
- Ronald Reagan Ballistic Missile Defense Test Site
- Ronald Shusett
- Ronaldo Rogério de Freitas Mourão
- Roncevaux Terra
- Ronchi test
- Ronda peridotite
- Roof (Chinese constellation)
- Roof and tunnel hacking
- Room (Chinese constellation)
- Room Service (American Horror Story)
- Rooster (zodiac)
- Rooster tail
- Root (Chinese constellation)
- Root microbiome
- Root nodule
- Roper Mountain Science Center
- Rosalind (moon)
- Rosalind Franklin (rover)
- Rosaly Lopes
- Roscoe Frank Sanford
- Roscosmos
- Rose (2012 film)
- Rose Center for Earth and Space
- Rose and Crown, Bow
- Rose and Crown, Isleworth
- Rose and Crown, St Albans
- Rose and Crown, Stoke Newington
- Roseiflexus castenholzii
- Roseland Observatory
- Rosemary Hill Observatory
- Rosemary Hutton
- Rosemary Wyse
- Rosenberger (crater)
- Roseobacter denitrificans
- Roseobacter litoralis
- Rosetta (spacecraft)
- Rosetta orbit
- Rosette Nebula
- Rosette sampler
- Rosgen Stream Classification
- Rosicrucian Fellowship
- Rosicrucianism
- Rosina Dafter
- Rosina Zornlin
- Rosmerta
- Rosocyanine
- Rosreestr
- Ross (Martian crater)
- Ross (lunar crater)
- Ross 128
- Ross 128 b
- Ross 154
- Ross 248
- Ross 47
- Ross 548
- Ross 614
- Ross 640
- Ross 695
- Ross Shafer
- Ross orogeny
- Rossall Hockey
- Rossall School
- Rossby (crater)
- Rossby radius of deformation
- Rossby wave instability in astrophysical discs
- Rosse (crater)
- Rosseland (crater)
- Rossi X-ray Timing Explorer
- Rossiter–McLaughlin effect
- Rost (crater)
- Rostock astronomical clock
- Roswell (TV series)
- Roswell (film)
- Roswell High
- Roswell That Ends Well
- Roswell, Little Green Man
- Roswell, New Mexico (TV series)
- Roswell, Texas
- Roswell: The Aliens Attack
- Rotary Rocket
- Rotating black hole
- Rotating ellipsoidal variable
- Rotating furnace
- Rotating radio transient
- Rotating reference frame
- Rotating spheres
- Rotating wall technique
- Rotating wheel space station
- Rotating-polarization coherent anti-Stokes Raman spectroscopy
- Rotation and Interior Structure Experiment
- Rotation around a fixed axis
- Rotation period
- Rotational Brownian motion (astronomy)
- Rotational modulation collimator
- Rotational spectroscopy
- Rotational–vibrational spectroscopy
- Roter Kamm crater
- Rothamsted Research
- Rothmann (crater)
- Rothney Astrophysical Observatory
- Rotmistrivka crater
- Rotorua City Geothermal Energy Empowering Act 1967
- Roua
- Roughnecks: Starship Troopers Chronicles
- Roughness length
- Rouketopolemos
- Roumiana Metcheva
- Round Trip to Mars
- Round and Around (Pink Floyd song)
- Roundness (geology)
- Rousillon Rupes
- Route 36 (bar)
- Routing (hydrology)
- Rover (space exploration)
- Rover Environmental Monitoring Station
- Rovibronic coupling
- Roving Mars
- Rovuma Plate
- Rowena Morrill
- Rowland (crater)
- Roxy Theatre (New York City)
- Roy A. Tucker
- Roy D. Bridges Jr.
- Roy Davis Jr.
- Roy Dommett
- Roy Estess
- Roy Gibson
- Roy Healy
- Roy Kerr
- Roy Kettle
- Roy Koerner
- Roy Krenkel
- Royal Astronomical Society
- Royal Astronomical Society of Canada
- Royal Astronomical Society of New Zealand
- Royal British Columbia Museum
- Royal Corps of Military Surveyors and Draftsmen
- Royal Exhibitors
- Royal Harwood Frost
- Royal Highlander
- Royal Meteorological Society
- Royal Netherlands Aerospace Centre
- Royal Netherlands Meteorological Institute
- Royal Oak, Bexleyheath
- Royal Oak, Eccles
- Royal Observatory of Belgium
- Royal Observatory of Madrid
- Royal Observatory, Cape of Good Hope
- Royal Observatory, Edinburgh
- Royal Observatory, Greenwich
- Royal Ontario Museum Bat Cave
- Royal Palm (train)
- Royal Pavilion Tavern
- Royal Space Force: The Wings of Honnêamise
- Royal stars
- Roz Cron
- Roz Kaveney
- Rozhdestvenskiy (crater)
- Rozhen Observatory
- Rp-process
- Ru 7
- RuPaul
- Ruan Yuan
- Ruaniaceae
- Rub el Hizb
- Rubber room (bunker)
- Rubbersheeting
- Rubble pile
- Ruben Brandt, Collector
- Rubicon Foundation
- Rubielos de la Cérida impact structure
- Rubin 9.2
- Rubin-8
- Rubin–Ford effect
- Rubis (rocket)
- Rubrobacter xylanophilus
- Rubrocurcumin
- Ruby Payne-Scott
- Rucbah
- Rudaux (crater)
- Rudolf Elmayer von Vestenbrugg
- Rudolf Ferdinand Spitaler
- Rudolf König
- Rudolf Mössbauer
- Rudolf Nebel
- Rudolf Wolf
- Rudolf of Bruges
- Rudolph Belarski
- Rudolph Minkowski
- Rudolph Schild
- Rudolphine Tables
- Rudy Kennedy
- Rudy Wijnands
- Rufescent screech owl
- Rufous-banded owl
- Rufous-legged owl
- Rui Faleiro
- Rui da Silva (DJ)
- Rule of marteloio
- Rule of mutual exclusion
- Rum layered intrusion
- Rumberas film
- Rumford (crater)
- Rumi Nakamura
- Run Like Hell
- Run, Angel, Run!
- Run-on
- Runaround (story)
- Runaway breakdown
- Runaway greenhouse effect
- Rundetaarn
- Rune Reilly Kölsch
- RuneScape
- Runge (crater)
- Runic calendar
- Runoff curve number
- Runoff footprint
- Runoff model (reservoir)
- Runway Awareness and Advisory System
- Rupert Wildt
- Rupes
- Rupes Altai
- Rupes Boris
- Rupes Cauchy
- Rupes Kelvin
- Rupes Recta
- Rupes Tenuis
- Ruprecht 147
- Ruric Wrigley
- Rush Holt Jr.
- Rush Street (Chicago)
- Russ Chauvenet
- Russ Winstanley
- Russell (Martian crater)
- Russell (lunar crater)
- Russell Alan Hulse
- Russell B. Farr
- Russell Blackford
- Russell Foster
- Russell L. Rogers
- Russell Merle Genet
- Russell Ormond Redman
- Russell W. Porter
- Russian Aerospace Defence Forces
- Russian Aerospace Forces
- Russian Astronomical Society
- Russian Journal of Earth Sciences
- Russian Orbital Segment
- Russian Research Module
- Russian Satellite Communications Company
- Russian Space Command
- Russian Space Forces
- Russian Space Research Institute
- Russian cosmism
- Russian names in space
- Russian tortoise
- Rustaveli (crater)
- Rusty Hevelin
- Rusty Schweickart
- Rusty Warren
- Rutabaga
- Rutger Sernander
- Ruth (Venusian crater)
- Ruth Agnes Daly
- Ruth Blake
- Ruth Durrer
- Ruth Gates
- Ruth J. Northcott
- Ruth Murray-Clay
- Ruth Sato
- Ruth Vassos
- Rutherford (Martian crater)
- Rutherford (lunar crater)
- Rutherford (rocket engine)
- Rutherford Appleton Laboratory
- Rutherford backscattering spectrometry
- Rutherfurd (crater)
- Rutland Arms, Hammersmith
- Rutland Halloween Parade
- Rutter (nautical)
- Ruysch (crater)
- Rwanda
- Ryan Aeronautical
- Ryan Tubridy
- Rychard Bouwens
- Rydberg (crater)
- Rydberg constant
- Rydberg ionization spectroscopy
- Rydberg molecule
- Rydberg–Ritz combination principle
- Ryder (crater)
- Ryle Telescope
- Rynin (crater)
- Ryori
- Ryukyu arc
- Ryu–Takayanagi conjecture
- Ryves Comet
- Ryūkyū scops owl
- Réaumur (crater)
- Référentiel pédologique
- Régine Zylberberg
- Río Cuarto craters
- Römer (crater)
- Röntgen (crater)
- Rāja yoga
- Rūdaki (crater)
- S Antliae
- S Apodis
- S Arae
- S Boötis
- S Canis Minoris
- S Carinae
- S Cassiopeiae
- S Coronae Australis
- S Coronae Borealis
- S Crucis
- S Doradus
- S Eridani
- S Microscopii
- S Monocerotis
- S Muscae
- S Normae
- S Ori 70
- S Orionis
- S Pegasi
- S Persei
- S Pictoris
- S Sagittae
- S Scuti
- S Trianguli Australis
- S Ursae Minoris
- S Virginis
- S Vulpeculae
- S-1 (satellite)
- S-45 (satellite)
- S-45A
- S-46A
- S-500 missile system
- S-55 (satellite)
- S-550
- S-56 (satellite)
- S-66A
- S-GPS
- S-IC
- S-II
- S-IV
- S-IVB
- S-Net
- S-Series (rocket family)
- S-brane
- S-duality
- S-factor
- S-process
- S-type asteroid
- S-type star
- S. A. Zaidi
- S. Cofré
- S. David Griggs
- S. E. U. I. S.
- S. M. Razaullah Ansari
- S. Shankar
- S. Suresh Babu
- S. T. Joshi
- S.M. Naqvi Gold Medal
- S/2003 J 10
- S/2003 J 12
- S/2003 J 16
- S/2003 J 2
- S/2003 J 23
- S/2003 J 4
- S/2003 J 9
- S/2004 S 12
- S/2004 S 13
- S/2004 S 17
- S/2004 S 20
- S/2004 S 21
- S/2004 S 22
- S/2004 S 23
- S/2004 S 24
- S/2004 S 25
- S/2004 S 26
- S/2004 S 27
- S/2004 S 28
- S/2004 S 29
- S/2004 S 3
- S/2004 S 30
- S/2004 S 31
- S/2004 S 32
- S/2004 S 33
- S/2004 S 34
- S/2004 S 35
- S/2004 S 36
- S/2004 S 37
- S/2004 S 38
- S/2004 S 39
- S/2004 S 4
- S/2004 S 6
- S/2004 S 7
- S/2006 S 1
- S/2006 S 3
- S/2007 S 2
- S/2007 S 3
- S/2009 S 1
- S/2015 (136472) 1
- S2 (star)
- S4 Index
- S400 (rocket engine)
- S5 0014+81
- S5-HVS1
- S5.142
- S5.4
- S5.92
- S5.98M
- S55 (star)
- S62 (star)
- SABIA-Mar
- SAC-D
- SACI-1
- SACI-2
- SACRED
- SAFE AIR
- SAFIR
- SAFIRE radar
- SAGE III on ISS
- SAGEM Sigma 30
- SAGES Legacy Unifying Globulars and GalaxieS Survey
- SANSA Space Science
- SAO 206462
- SAOCOM
- SAPPHIRE
- SAR-Lupe
- SARAL
- SAX J1808.4−3658
- SB-649868
- SBS 1
- SBS 2 (satellite)
- SBS 3 (satellite)
- SBS 4
- SBS 6 (satellite)
- SBUV/2
- SCALD
- SCATSAT-1
- SCIAMACHY
- SCICEX
- SCISAT-1
- SCORE (satellite)
- SCOS 2000
- SCP 06F6
- SCR 1845−6357
- SCR J1546−5534
- SCR-1
- SDC 335.579-0.292
- SDS-1
- SDS-4
- SDSS J001820.5−093939.2
- SDSS J0100+2802
- SDSS J0106−1000
- SDSS J0303-0019
- SDSS J090745.0+024507
- SDSS J0927+2943
- SDSS J102915+172927
- SDSS J1106+1939
- SDSS J1229+1122
- SDSS J1240+6710
- SDSS J1254+0846
- SDSS J1416+1348
- SDSSJ0946+1006
- SEBAL
- SECOR
- SEDAT
- SEDSAT-1
- SEEDS-2
- SEG-Y
- SELENE
- SELENE-2
- SEOSat-Ingenio
- SERENDIP
- SERN
- SERVIS-1
- SERVIS-2
- SES Americom
- SES Astra
- SES Platform Services
- SES S.A.
- SES Sirius
- SES World Skies
- SES-1
- SES-10
- SES-11
- SES-12
- SES-14
- SES-15
- SES-16
- SES-17
- SES-2
- SES-3
- SES-5
- SES-6
- SES-7
- SES-8
- SES-9
- SESL Australia
- SETI Institute
- SETI@home
- SETI@home beta
- SETILive
- SETIcon
- SEVENDIP
- SF Studios
- SFA Observatory
- SGDC-1
- SGDC-2
- SGR 0501+4516
- SGR 0525−66
- SGR 1627−41
- SGR 1806−20
- SGR 1900+14
- SGR 1935+2154
- SGR J1550−5418
- SGR J1745−2900
- SGS Genesis
- SH-053-R-CH3-2′F
- SHADO Interceptor
- SHALOM (satellite)
- SHARAD
- SHC014-CoV
- SHERPA (space tug)
- SHETRAN
- SHGb02+14a
- SI-200
- SICRAL 1B
- SILAM
- SIMBAD
- SIMP J013656.5+093347
- SIMPLE (dark matter experiment)
- SIPS 1259-4336
- SIR-2
- SISPRE
- SISTINE
- SK-42 reference system
- SKIM
- SKY Perfect JSAT
- SKYGLOW
- SLDCOM
- SLIM
- SM-65 Atlas
- SM-68 Titan
- SMARA (spacecraft)
- SMART-1
- SMC 018136
- SMILE (spacecraft)
- SMM J2135-0102
- SMSS J031300.36−670839.3
- SMSS J215728.21-360215.1
- SN 1000+0216
- SN 1006
- SN 1054
- SN 1181
- SN 1572
- SN 185
- SN 1885A
- SN 1895B
- SN 1917A
- SN 1939C
- SN 1940B
- SN 1961I
- SN 1961V
- SN 1972E
- SN 1979C
- SN 1986G
- SN 1987A
- SN 1990U
- SN 1992bd
- SN 1993J
- SN 1994D
- SN 1994I
- SN 1996ah
- SN 1997D
- SN 1998S
- SN 1998aq
- SN 1998bw
- SN 1999ec
- SN 1999eu
- SN 2002bj
- SN 2002cx
- SN 2003B
- SN 2003H
- SN 2003fg
- SN 2003gd
- SN 2004dj
- SN 2004gt
- SN 2005B
- SN 2005E
- SN 2005ap
- SN 2005bc
- SN 2005cs
- SN 2005df
- SN 2005gj
- SN 2005gl
- SN 2006X
- SN 2006gy
- SN 2006jc
- SN 2007bi
- SN 2007sr
- SN 2007uy
- SN 2008D
- SN 2008ax
- SN 2008ha
- SN 2009gj
- SN 2009ip
- SN 2010lt
- SN 2011by
- SN 2011dh
- SN 2011fe
- SN 2012fr
- SN 2013ej
- SN 2013fs
- SN 2014J
- SN 2016aps
- SN 2018cow
- SN 2213-1745
- SN 386
- SN 393
- SN Refsdal
- SN UDS10Wil
- SNAP-1
- SNAP-10A
- SNC Demo-1
- SNO+
- SNOLAB
- SNR 0509-67.5
- SO(10)
- SOAR (spaceplane)
- SOBEPS
- SOCCOM project
- SOCET SET
- SOCRATES (satellite)
- SOFA (astronomy)
- SOFAR channel
- SOHO 2333
- SOL: Exodus
- SOLAR (ISS)
- SOLRAD
- SOLRAD 1
- SOLRAD 10
- SOLRAD 2
- SOLRAD 3
- SOLRAD 4
- SOLRAD 4B
- SOLRAD 6
- SOLRAD 7A
- SOLRAD 7B
- SOLRAD 8
- SOLRAD 9
- SOPHIE échelle spectrograph
- SOUNDPONY
- SOXS
- SP-100
- SP77 31-18
- SP77 46-44
- SPADEX
- SPARK (rocket)
- SPC file format
- SPEARpesticides
- SPECULOOS
- SPEDAS
- SPEX (astronomy)
- SPHERES
- SPHEREx
- SPICA (spacecraft)
- SPOT (satellite)
- SPOT Satellite Messenger
- SPRITE (spacecraft)
- SPT-100
- SPT-CL J0546-5345
- SPT-CL J2106-5844
- SPT0418-47
- SPT0615-JD
- SRMSAT
- SS 433
- SS Cygni
- SS Experiment Camp
- SS Girls
- SS Ursae Minoris
- SS Virginis
- SS-16 Temp-2S
- SSA22 Protocluster
- SSBS S1
- SSETI Express Satellite
- SSIES
- SSL (company)
- SSL 1300
- SSMIS
- SSOT (satellite)
- SSPSF model
- SSSPM J1549-3544
- SSTGFLS J222557+601148
- SSURGO
- SSVP docking system
- ST Camelopardalis
- ST-1
- ST-124-M3 inertial platform
- ST-2
- STACEE
- STAMINA4Space Program
- STANAG 3910
- STANAG 4586
- STARC-ABL
- STARGATE
- STARS-II
- STARSHINE (satellite)
- STE-QUEST
- STEP (satellite)
- STEREO
- STEREO experiment
- STEX
- STRaND-1
- STS-1
- STS-100
- STS-101
- STS-102
- STS-103
- STS-104
- STS-105
- STS-106
- STS-107
- STS-108
- STS-109
- STS-110
- STS-111
- STS-112
- STS-113
- STS-114
- STS-115
- STS-116
- STS-117
- STS-118
- STS-119
- STS-120
- STS-121
- STS-122
- STS-123
- STS-124
- STS-125
- STS-126
- STS-127
- STS-128
- STS-129
- STS-130
- STS-131
- STS-132
- STS-133
- STS-134
- STS-135
- STS-2
- STS-26
- STS-27
- STS-28
- STS-29
- STS-3
- STS-30
- STS-31
- STS-32
- STS-33
- STS-34
- STS-35
- STS-36
- STS-37
- STS-38
- STS-39
- STS-3xx
- STS-4
- STS-40
- STS-400
- STS-41
- STS-41-B
- STS-41-C
- STS-41-D
- STS-41-G
- STS-42
- STS-43
- STS-44
- STS-45
- STS-46
- STS-47
- STS-48
- STS-49
- STS-5
- STS-50
- STS-51
- STS-51-A
- STS-51-B
- STS-51-C
- STS-51-D
- STS-51-F
- STS-51-G
- STS-51-I
- STS-51-J
- STS-51-L
- STS-52
- STS-53
- STS-54
- STS-55
- STS-56
- STS-57
- STS-58
- STS-59
- STS-6
- STS-60
- STS-61
- STS-61-A
- STS-61-B
- STS-61-C
- STS-61-M
- STS-62
- STS-62-A
- STS-63
- STS-64
- STS-65
- STS-66
- STS-67
- STS-68
- STS-69
- STS-7
- STS-70
- STS-71
- STS-72
- STS-73
- STS-74
- STS-75
- STS-76
- STS-77
- STS-78
- STS-79
- STS-8
- STS-80
- STS-81
- STS-82
- STS-83
- STS-84
- STS-85
- STS-86
- STS-87
- STS-88
- STS-89
- STS-9
- STS-90
- STS-91
- STS-92
- STS-93
- STS-94
- STS-95
- STS-96
- STS-97
- STS-98
- STS-99
- STSAT-2A
- STSAT-2B
- STSAT-2C
- SU Andromedae
- SU Aurigae
- SU Ursae Majoris
- SU(2) color superconductivity
- SUNMOS
- SUNSAT
- SUPARCO Satellite Ground Station
- SV Centauri
- SV Vulpeculae
- SVET plant growth system
- SW Andromedae
- SW Sextantis variable
- SWAP (New Horizons)
- SWAP (instrument)
- SWEAP
- SWEEPS J175853.92−291120.6
- SWEEPS-04
- SWEEPS-10
- SWEEPS-11
- SWEPOS
- SWIFT J1756.9−2508
- SX Arietis variable
- SX Centauri
- SX Corvi
- SX Leonis Minoris
- SX Phoenicis
- SX Phoenicis variable
- SXDF-NB1006-2
- SY Muscae
- SYZ conjecture
- SZ Crateris
- Saab Sensis Corporation
- Saarijärvi crater
- Saban Theatre
- Sabatier (crater)
- Sabatino de Ursis
- Saber (Fate/stay night)
- Saber Rider and the Star Sheriffs
- Sabina Escola Parque do Conhecimento
- Sabine (crater)
- Sabine Hossenfelder
- Sabine Schindler
- Sabine Stanley
- Sabis Vallis
- Sabkha
- Sabrina Stierwalt
- Sabrina Vallis
- Sacajawea Patera
- Saccharolobus shibatae
- Saccharomyces cerevisiae
- Saccharopolyspora halophila
- Saccharopolyspora halotolerans
- Saccharopolyspora lacisalsi
- Saccharopolyspora qijiaojingensis
- Sachs Patera
- Sachs–Wolfe effect
- Sack of Rome (546)
- Sackboy: A Big Adventure
- Sacra Mensa
- Sacral architecture
- Sacred Flesh
- Sacred fire of Vesta
- Sacred geometry
- Sacred waters
- Sacrobosco (crater)
- Sad Sweet Dreamer
- Sadao Sei
- Saddle (landform)
- Sade Sati
- Sadler effect
- Sadomania
- Sadr Region
- Sadr al-Shari'a al-Asghar
- Sadratnamala
- Sadun Boro
- Saenger (crater)
- Saenger (spacecraft)
- Saenger Theatre (Mobile, Alabama)
- Saenger Theatre (New Orleans)
- Saenger Theatre (Pensacola, Florida)
- Saenger Theatre (Pine Bluff, Arkansas)
- Safe (Firefly)
- Safe affordable fission engine
- Safe mode (spacecraft)
- Safeguard Program
- Safety data sheet
- Safety factor (plasma physics)
- Safety-critical system
- Sag (geology)
- Sag pond
- Saga of the Skolian Empire
- Sagaing Fault
- Sagamihara Campus
- Sagamore Hill Radio Observatory
- Sagan (crater)
- Sagan Planet Walk
- Sagitta
- Sagitta in Chinese astronomy
- Sagittarius (astrology)
- Sagittarius (constellation)
- Sagittarius A
- Sagittarius A*
- Sagittarius A* cluster
- Sagittarius B2
- Sagittarius Dwarf Irregular Galaxy
- Sagittarius Dwarf Spheroidal Galaxy
- Sagittarius Stream
- Sagittarius Window Eclipsing Extrasolar Planet Search
- Sagittarius in Chinese astronomy
- Sagnac effect
- Saha (crater)
- Saha ionization equation
- Sahab Geographic and Drafting Institute
- Sahara
- Sahara Davenport
- Sahara Forest Project
- Sahara Sue
- Sahara pump theory
- Saharan Air Layer
- Sahasra
- Saheki (crater)
- Sahl ibn Bishr
- SahysMod
- Said al-Andalusi
- Sail Away to Avalon
- Sail On! Sail On!
- SailTimer
- Sailing Directions
- Sailing stones
- Sailor Mars
- Sailor Mercury
- Sailor Moon
- Sailor Moon (TV series)
- Sailor Moon (character)
- Sailor Moon Crystal
- Sailor Moon Eternal
- Sailor Moon R: The Movie
- Sailor Moon Sailor Stars
- Sailor Moon SuperS
- Sailor Moon SuperS: The Movie
- Sailor Neptune
- Sailor Pluto
- Sailor Uranus
- Sailor Venus
- Saint David's Buried Gorge
- Saint Elmo – Hikari no Raihousha
- Saint Helena meridian
- Saint John's Eve
- Saint Joseph's dreams
- Saint Lawrence River
- Saint Louis Science Center
- Saint Martin crater
- Saint Stephens meridian
- Saint-Michel cinema attack
- Saint-Sulpice, Paris
- Saiph
- Saji Observatory
- Sakhalin
- Sakigake
- Sakis Rouvas
- Saku Children's Science Dome for the Future
- Sakura (train)
- Sakurai's Object
- Sal Piro
- Sala Senkayi
- Salacia
- Salaga (crater)
- Salamander (video game)
- Salamander 2
- Salamanders in folklore
- Salamandrella keyserlingii
- Saleem Ali (academic)
- Saleh Ajeery
- Saleh Muhammad Alladin
- Salena Jones
- Salih (crater)
- Salim Mehmud
- Saline seep
- Salinicola salarius
- Salinirubellus salinus
- Salinity
- Salinity in Australia
- Salizhan Sharipov
- Sallie Blair
- Sally Oey
- Sally Poncet
- Sally Ride
- Salmon and Ball
- Salon Kitty (film)
- Salt Lake meridian
- Salt glacier
- Salt marsh
- Salt marsh dieback
- Salt pan (geology)
- Salt pannes and pools
- Salt surface structures
- Salt tectonics
- Salt tide
- Salt tolerance of crops
- SaltMod
- Saltation (geology)
- Salto di Quirra
- Saltwater intrusion
- Saltwater intrusion in California
- Salutation, Hammersmith
- Salute (pyrotechnics)
- Salvador Freixedo
- Salvage 1
- Salyut 1
- Salyut 2
- Salyut 3
- Salyut 4
- Salyut 5
- Salyut 6
- Salyut 6 EO-1
- Salyut 6 EP-1
- Salyut 7
- Salyut programme
- Sam & Max Save the World
- Sam Beddingfield
- Sam Heughan
- Sam Merwin Jr.
- Sam Moskowitz
- Sam Nazarian
- Sam Shearon
- Sam Witwer
- Samad (crater)
- Samantha Bee
- Samantha Bentley
- Samantha Carter
- Samantha Cristoforetti
- Samantha Ronson
- Samara Valles
- Samaritan woman at the well
- Samarkand Sulci
- Samaya Nissanke
- Sambatiyon
- Samhain
- Sammy Terry
- Sammy the Owl
- Samogitian Sanctuary
- Samorost
- Samorost 2
- Samorost 3
- Samos (satellite)
- Samos 2
- Samos 3
- Samos 4
- Samos-F
- Sample Analysis at Mars
- Sample Collection for Investigation of Mars
- Sample-return mission
- Sampson (crater)
- Samsara (Red Dwarf)
- Samudrika Shastra
- Samuel Alfred Mitchell
- Samuel Arthur Saunder
- Samuel C. Phillips
- Samuel Eaton Thompson
- Samuel Edward Konkin III
- Samuel Hargress II
- Samuel Herrick (astronomer)
- Samuel Hill (sea captain)
- Samuel L. Jackson
- Samuel Langley
- Samuel Molyneux
- Samuel Okoye
- Samuel Oppenheim
- Samuel Oschin telescope
- Samuel R. Delany
- Samuel Stearns
- Samuel T. Durrance
- Samuel Wallis
- Samurai (Super Friends)
- Samurai Cop
- Samurai Jack
- Samyung ENC
- San Andreas Fault Observatory at Depth
- San Bernardino meridian
- San Diego Space Society
- San Diego State University College of Sciences
- San Francisco Chief
- San Francisco Estuary and Watershed Science
- San Francisco Zephyr
- San Gervasio (Maya site)
- San Joaquin (soil)
- San José Observatory
- San Marco 1
- San Marco programme
- San Marino
- San Marino Scale
- San Pedro Valley Observatory
- San Petronio, Bologna
- San Sebastiano, Verona
- San Tropez (song)
- San Vittore Observatory
- Sanai (crater)
- Sanamahi creation myth
- Sanat Kumara
- Sanctuary Music Arena
- Sanctum 2
- Sand fence
- Sand geyser
- Sand island
- Sand sheet
- Sand table
- Sand wave
- Sand-based athletic fields
- Sandbag
- Sandbian
- Sander (crater)
- Sander Kaasjager
- Sander Kleinenberg
- Sander van Doorn
- Sandfall
- Sandford Park Alehouse
- Sandhawk
- Sandia Base
- Sandia National Laboratories
- Sandip Chakrabarti
- Sandman
- Sandman (DC Comics)
- Sandman (Marvel Comics)
- Sandman (Wesley Dodds)
- Sandman Midnight Theatre
- Sandman Mystery Theatre
- Sandman: 24 Hour Diner
- Sandmännchen
- Sandplain
- Sandra Cauffman
- Sandra Collins
- Sandra Faber
- Sandra Magnus
- Sandra Miesel
- Sandra Savaglio
- Sandringham Hotel, Newtown
- Sanduleak -69 202
- Sandwich Fault Zone
- Sandworm (Dune)
- Sandworms of Dune
- Sandy Antunes
- Sandy Glacier Caves
- Sandy Hawkins
- Sandy Rivera
- Sanford (crater)
- Sangeeta Malhotra
- Sanghyang
- Sangihe scops owl
- Sanguibacteraceae
- Sanirajak
- Sanitary sewer
- Sanitary sewer overflow
- Sanjeev Dhurandhar
- Sanjeev Gupta (geologist)
- Sanjoy
- Sankara Varman
- Sanketa Nidhi
- Sankeys
- Sankranti
- Sankt Andreasberg Observatory
- Sans Souci Cabaret
- Sansculottides
- Santa Claus Conquers the Martians
- Santa Fe (Martian crater)
- Santa Fe de Luxe
- Santa Fe impact structure
- Santa Lucia Stroncone Astronomical Observatory
- Santa Maria (crater)
- Santa Maria Island Station
- Santa Maria Novella
- Santa Maria River Fault
- Santa Maria degli Angeli e dei Martiri
- Santa Marta crater
- Santa María Rupes
- Santa Rosa de Viterbo meteorite
- Santa Vitoria do Palmar meteorite
- Santa Ynez Fault
- Santa and the Satellite
- SantaCon
- Santamasa
- Santbech (crater)
- Santiago Salazar (musician)
- Santiago: a Myth of the Far Future
- Santika Club fire
- Santorini Facula
- Santos (DJ)
- Santos-Dumont (crater)
- Santucci's Armillary Sphere
- Sanyasa yoga
- Sao (moon)
- Sapas Mons
- Saphir (rocket)
- Sapkota (crater)
- Sapphire (satellite)
- Sapric
- Saprolite
- Saprophagy
- Saptami
- Saptarishi
- Sara Ellison
- Sara Imari Walker
- Sara J. Schechner
- Sara King
- Sara Larkin
- Sara Mednick
- Sara Russell
- Sara Schaefer
- Sara Seager
- Sarabhai (crater)
- Sarafina Nance
- Saragossa Terra
- Sarah Ballard
- Sarah Bridle
- Sarah Brightman
- Sarah Dodson-Robinson
- Sarah Elizabeth Whitin
- Sarah Fawcett
- Sarah Gallagher
- Sarah Gorelick
- Sarah Hengler
- Sarah Hörst
- Sarah K. Noble
- Sarah Lewitinn
- Sarah Main
- Sarah Matthews
- Sarah Milkovich
- Sarah Parcak
- Sarah Rugheimer
- Sarah Salmond
- Sarah Stewart Johnson
- Sarah T. Stewart-Mukhopadhyay
- Sarah Tuttle
- Sarah Young (DJ)
- Sarandib Planitia
- Saraswati Supercluster
- Saraswati yoga
- Sarbani Basu
- Sarbeswar Bujarbarua
- Sardinia Radio Telescope
- Sarek
- Sarh (crater)
- Sarin
- Sark
- Sarlacc
- Sarmiento (crater)
- Saros (astronomy)
- Sarpa Facula
- Sarsen
- Sarton (crater)
- Sarvartha Chintamani
- Sarvatobhadra Chakra
- Sasha & John Digweed
- Sasha (DJ)
- Sasha Velour
- Sashtiabdhapoorthi
- Saskatoon experiment
- Sasserides (crater)
- Sat Bir Singh Khalsa
- Satan's Cheerleaders
- Satan's Sadists
- Satanis
- Satcom (satellite)
- Satcom on the Move
- Satellit
- Satellite
- Satellite Analysis Branch
- Satellite Business Systems
- Satellite Catalog Number
- Satellite Data System
- Satellite IRG
- Satellite Image Time Series
- Satellite Instructional Television Experiment
- Satellite Launch Vehicle
- Satellite Sentinel Project
- Satellite bus
- Satellite collision
- Satellite constellation
- Satellite contribution
- Satellite crop monitoring
- Satellite data unit
- Satellite flare
- Satellite formation flying
- Satellite galaxies of the Milky Way
- Satellite galaxy
- Satellite geolocation
- Satellite imagery
- Satellite insurance
- Satellite internet constellation
- Satellite navigation
- Satellite navigation device
- Satellite navigation software
- Satellite phone
- Satellite revisit period
- Satellite surface salinity
- Satellite system (astronomy)
- Satellite temperature measurements
- Satellite watching
- Satellize
- Satellogic
- SathyabamaSat
- Sati (practice)
- Satirical cartography
- Satish Dhawan
- Satish Dhawan Space Centre
- Satkhira bombings
- Satmap
- Satmex
- Satoru Otomo
- Satoshi Furukawa
- Satoshi Takamatsu
- Satoshi Tomiie
- Satre (Etruscan god)
- Satrec Initiative
- Saturated absorption spectroscopy
- Saturated spectroscopy
- Saturation vapor curve
- Saturn
- Saturn (mythology)
- Saturn (rocket family)
- Saturn 3
- Saturn A-1
- Saturn A-2
- Saturn Atmospheric Entry Probe
- Saturn B-1
- Saturn Bomberman
- Saturn Bomberman Fight!!
- Saturn C-2
- Saturn C-3
- Saturn C-4
- Saturn C-5N
- Saturn C-8
- Saturn I
- Saturn I SA-1
- Saturn I SA-2
- Saturn I SA-3
- Saturn I SA-4
- Saturn I SA-5
- Saturn IB
- Saturn IB-A
- Saturn IB-B
- Saturn IB-D
- Saturn INT-20
- Saturn INT-21
- Saturn MLV
- Saturn Nebula
- Saturn Rising
- Saturn V
- Saturn V instrument unit
- Saturn V-3
- Saturn V-B
- Saturn V-Centaur
- Saturn in fiction
- Saturn return
- Saturn's Children (novel)
- Saturn's Gallic group of satellites
- Saturn's Inuit group of satellites
- Saturn's Norse group of satellites
- Saturn's hexagon
- Saturn's moons in fiction
- Saturn-Shuttle
- Saturnalia (Callin novel)
- Saturnalia Fossa
- Satélite Tecnológico
- Satélite de Coleta de Dados
- Satélite de Reentrada Atmosférica
- Saucer Country
- Saudi Space Agency
- Saudi-OSCAR 50
- SaudiGeoSat-1/HellasSat-4
- SaudiSat 5A,5B
- SaudiSat-4
- Saudia Aerospace Engineering Industries
- Saul Adelman
- Saul Perlmutter
- Saul Rappaport
- Saul Teukolsky
- Saul of the Mole Men
- Saulė
- Saunder (crater)
- Saura
- Saurian Expedition of 1905
- Saussure (crater)
- Savage (crater)
- Savage Dawn
- Savage Planet (film)
- Savage Weekend
- Savage! (1973 theatrical film)
- Savana violenta
- Save the Climate
- Save the Robots
- Saved!
- Savilian Professor of Astronomy
- Saville and Martin
- Savitr
- Savoir Beds
- Savory brittleness scale
- Sawa Lake
- Sawdust
- Saxon (firework)
- Sayh al Uhaymir 169
- Sayonara Jupiter (film)
- Sayyed Ibn Tawus
- Sazhen-S
- Scalar field dark matter
- Scalar field solution
- Scalar theories of gravitation
- Scalar-vector-tensor decomposition
- Scalar–tensor theory
- Scalar–tensor–vector gravity
- Scale (map)
- Scale factor (cosmology)
- Scale height
- Scaled Composites
- Scaled Composites 401
- Scaled Composites ARES
- Scaled Composites ATTT
- Scaled Composites Catbird
- Scaled Composites Model 367 BiPod
- Scaled Composites Pond Racer
- Scaled Composites Proteus
- Scaled Composites Stratolaunch
- Scaled Composites Tier One
- Scaled Composites White Knight
- Scaled Composites White Knight Two
- Scaliger (crater)
- Scalindua brodae
- Scalindua wagneri
- Scalloped margin dome
- Scalloped topography
- Scalps
- Scamander Vallis
- Scandian orogeny
- Scanning Habitable Environments with Raman and Luminescence for Organics and Chemicals
- Scanning mobility particle sizer
- Scanning multichannel microwave radiometer
- Scanning tunneling spectroscopy
- Scaphe
- Scarab (rover)
- Scared Shrekless
- Scarface (Predator)
- Scarlatti (crater)
- Scarlet Heart
- Scarsdale Tavern
- Scary Godmother
- Scary Godmother: Halloween Spooktakular
- Scary Godmother: The Revenge of Jimmy
- Scary Movie 3
- Scary or Die
- Scattered disc
- Scattering amplitude
- Scatterometer
- Sceptre (fusion reactor)
- Sceptrum Brandenburgicum
- Sceptrum et Manus Iustitiae
- Schaeberle (Martian crater)
- Schaeberle (lunar crater)
- Schaefer–Bergmann diffraction
- Scheele (crater)
- Scheiner (crater)
- Schelte J. Bus
- Schema for horizontal dials
- Schema for vertical declining dials
- Scherrer equation
- Schiaparelli (Martian crater)
- Schiaparelli (lunar crater)
- Schiaparelli EDM
- Schickard (crater)
- Schiefspiegler
- Schiehallion experiment
- Schikorr reaction
- Schiller (crater)
- Schisler Museum of Wildlife & Natural History and McMunn Planetarium
- Schismatrix
- Schjellerup (crater)
- Schlatt (landform)
- Schlenkerla
- Schlesinger (crater)
- Schliemann (crater)
- Schlüter (crater)
- Schmidding SG 34
- Schmidt (Martian crater)
- Schmidt (lunar crater)
- Schmidt camera
- Schmidt corrector plate
- Schmidt hammer
- Schmidt-Väisälä camera
- Schmidt–Cassegrain telescope
- Schmidt–Newtonian telescope
- Schmutzdecke
- Schneller (crater)
- Schoenflies notation
- Scholz's Star
- Schomberger (crater)
- School for Sex
- School of GeoSciences, University of Edinburgh
- School of Geodesy and Geomatics, Wuhan University
- School of Physics and Astronomy, University of Edinburgh
- School of the Holy Beast
- Schorr (crater)
- Schreibersite
- Schrofen
- Schroter's Valley
- Schrödinger (crater)
- Schrödinger–Newton equation
- Schröter (lunar crater)
- Schubert (Mercurian crater)
- Schubert (lunar crater)
- Schulmädchen-Report
- Schumacher (crater)
- Schumann resonances
- Schumann–Runge bands
- Schuster (crater)
- Schuster Laboratory
- Schwabe (crater)
- Schwarzschild (crater)
- Schwarzschild coordinates
- Schwarzschild criterion
- Schwarzschild geodesics
- Schwarzschild metric
- Schwarzschild radius
- Schwarzschild's equation for radiative transfer
- Schönberg–Chandrasekhar limit
- Schönfeld (crater)
- Sci-Tech Daresbury
- SciBooNE
- Science City at Union Station
- Science Fiction South Africa
- Science Fiction Volume One: The Osiris Child
- Science Innovation Award
- Science Museum Oklahoma
- Science Museum of Map and Survey
- Science Museum of Minnesota
- Science Museum of Virginia
- Science Museum, London
- Science North
- Science Power Platform
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- Science and Technology Education Innovation Center
- Science and Technology Facilities Council
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- Science tourism
- Science, technology, society and environment education
- Science-Enabling Technologies for Heliophysics
- Scientia Marina
- Scientific International Research in Unique Terrestrial Station
- Scientific information from the Mars Exploration Rover mission
- Scientific research on the International Space Station
- Scillitoxin
- Scimitar antenna
- Scintillation counter
- Scintillometer
- Sciothericum telescopicum
- Scipione Chiaramonti
- Sclerometer
- Scobee (crater)
- Scobey (soil)
- Scolecodont
- Scolpaig
- Scooby-Doo and the Ghoul School
- Scooby-Doo! Moon Monster Madness
- Scooby-Doo! The Sword and the Scoob
- Scooby-Doo! and the Goblin King
- Scopas (crater)
- Scopulus
- Scorched Planet
- Scoresby (crater)
- Scoria
- Scorpia (Princesses of Power)
- Scorpio (astrology)
- Scorpio Rising (film)
- Scorpionism
- Scorpionism in Central America
- Scorpius
- Scorpius X-1
- Scorpius in Chinese astronomy
- Scorpius–Centaurus Association
- Scotophor
- Scott & White Sleep Disorders Center
- Scott (crater)
- Scott Altman
- Scott Apel
- Scott Bond
- Scott Carpenter
- Scott Carpenter Space Analog Station
- Scott E. Green
- Scott E. Parazynski
- Scott Edelman
- Scott Forbush
- Scott G. Borg
- Scott Gaudi
- Scott Hudson (electrical engineer)
- Scott Ian
- Scott J. Bolton
- Scott J. Horowitz
- Scott Jay Kenyon
- Scott Kelly (astronaut)
- Scott Manley
- Scott Maxwell (engineer)
- Scott Murphy (video game designer)
- Scott Pace
- Scott Polar Research Institute
- Scott S. Sheppard
- Scott Saunders Space Adventure
- Scott Tracy
- Scott Tremaine
- Scottish Highlands
- Scout (rocket family)
- Scout (train)
- Scout X
- Scout X-1
- Scout X-1A
- Scout X-2
- Scout X-2B
- Scout X-2M
- Scramble (video game)
- Scramjet
- Scramjet programs
- Scream (Michael Jackson album)
- Scream Blacula Scream
- Scream Pubs
- Scream Thy Last Scream
- Screamers (1995 film)
- Screamers: The Hunting
- Screened Poisson equation
- Screening (environmental)
- Scribing (cartography)
- Scroll plain
- Scrooge
- ScrumbleShip
- Scud missile
- Sculptor (constellation)
- Sculptor Dwarf Galaxy
- Sculptor Dwarf Irregular Galaxy
- Sculptor Galaxy
- Sculptor Group
- Sculptor Wall
- Sculptor in Chinese astronomy
- Scumrock
- Scutum (constellation)
- Scutum in Chinese astronomy
- Scutum–Centaurus Arm
- Sea
- Sea (astronomy)
- Sea Dragon (rocket)
- Sea Ice Physics and Ecosystem eXperiment
- Sea Launch
- Sea air
- Sea ice
- Sea ice concentration
- Sea ice emissivity modelling
- Sea ice thickness
- Sea interferometry
- Sea level rise
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- Sea state
- Sea surface temperature
- Sea, Lake, and Overland Surge from Hurricanes
- SeaOrbiter
- SeaSeep
- SeaWiFS
- Seabed
- Seabed gouging by ice
- Seafloor depth versus age
- Seafloor mapping
- Seafloor massive sulfide deposits
- Seafloor spreading
- Seal of Arizona
- Seal of Florida
- Seal of Hawaii
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- Seal of Indiana
- Seal of Kansas
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- Seal of North Dakota
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- Seal of Portland, Oregon
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- Seal of West Virginia
- Seal of Wyoming
- Seal of the District of Columbia
- Seal of the Federated States of Micronesia
- Seal of the Marshall Islands
- Seal of the Northern Mariana Islands
- Seal of the United States Space Force
- Sealab 2021
- Seaman A. Knapp
- Seamus (song)
- Seamus Haji
- Sean Dougherty
- Sean M. Carroll
- Sean Olson
- Sean Roden
- Sean Solomon
- Sean Wallace
- Sean's Bar
- Search for extraterrestrial intelligence
- Search the Sky
- Searching for Skylab
- Seares (crater)
- Sears Cook Walker
- Seasat
- Season of the Emergence
- Season of the Harvest
- Season of the Inundation
- Season of the Witch (Nox Arcana album)
- Seasonal Attribution Project
- Seasonal affective disorder
- Seasonal flows on warm Martian slopes
- Seasonal tropical forest
- Seasons on planets
- Seatbelt basalt
- Seattle Cinerama
- Seb Fontaine
- Sebastian F. Hönig
- Sebastian Ingrosso
- Sebastian von Hoerner
- Sebastianism
- Sebeș Formation
- Sebil (fountain)
- Secchi (Martian crater)
- Secchi (lunar crater)
- Sechenov (crater)
- Secobarbital
- Second Cambridge Catalogue of Radio Sources
- Second City Television
- Second Prophet of Amun
- Second Stage Lensmen
- Second principal meridian
- Second solar spectrum
- Second wind (sleep)
- Secondary atmosphere
- Secondary crater
- Secondary mirror
- Secondary organic aerosol
- Secondary payload
- Secondary poisoning
- Secret Agent Clank
- Secretan (company)
- Secrets of a Windmill Girl
- Sectility
- Section 8 (video game)
- Section 8: Prejudice
- Sector (instrument)
- Sector General
- Sector collapse
- Secular resonance
- Secundus the Silent
- Securus, Inc.
- Sediment
- Sediment Profile Imagery
- Sediment basin
- Sediment control
- Sediment transport
- Sediment trap (geology)
- Sedimentary Geology (journal)
- Sedimentary organic matter
- Sedimentary rock
- Sedimentation
- Sedimentology
- Sediment–water interface
- Sedna Planitia
- Sednoid
- See Emily Play
- See-Saw (song)
- Seed (2006 video game)
- Seeing Calvin Coolidge in a Dream
- Seeker (spacecraft)
- Seeking a Friend for the End of the World
- Seelenluft
- Seeliger (crater)
- Seest fireworks disaster
- Sefer HaTemunah
- Sefer Raziel HaMalakh
- Sefer Yetzirah
- Sega Net Link
- Sega Saturn
- Sega Saturn Magazine
- Segata Sanshiro
- Segers (crater)
- Segner (crater)
- Segue 1
- Segue 2
- Segue 3
- Seiberg duality
- Seiberg-Witten map
- Seiberg–Witten theory
- Seidai Miyasaka
- Seidel (crater)
- Seifu on EBS
- Seiji Ueda
- Seismic Experiment for Interior Structure
- Seismic interferometry
- Seismic inversion
- Seismic tomography
- Seismic vibrator
- Seismogenic layer
- Seita Emori
- Seitz (soil)
- Sekhmet
- Selardi
- Selected area diffraction
- Selection rule
- Selective availability anti-spoofing module
- Selene
- Selenean summit
- Selenicereus anthonyanus
- Selenicereus grandiflorus
- Selenicereus hamatus
- Selenicereus spinulosus
- Selenicereus undatus
- Selenographia, sive Lunae descriptio
- Selenographic coordinates
- Selenokhod
- Selenoyl fluoride
- Seleucus (crater)
- Seleucus of Seleucia
- Selex ES Falco
- Self-dual Palatini action
- Self-focusing
- Self-gravitation
- Self-interacting dark matter
- Self-making bed
- Self-mixing interferometry
- Self-mixing laser interferometry
- Self-replicating spacecraft
- Seliger Rocket
- Seligman Crystal
- Selim Lemström
- Selina Rosen
- Selk (crater)
- Seltorexant
- Selwyn G. Blaylock Medal
- Semeykin (crater)
- Semi-Conductor Laboratory
- Semi-Lagrangian scheme
- Semi-major and semi-minor axes
- Semi-synchronous orbit
- Semiclassical gravity
- Seminole (train)
- Semion Braude
- Semiosis (novel)
- Semnan Space Center
- Semper Mars
- Semyon Kosberg
- Seneca (crater)
- Senftleben–Beenakker effect
- Senko hanabi
- Sensitivity auditing
- Sentences of Sextus
- Sentient (video game)
- Sentinel Space Telescope
- Sentinel-1
- Sentinel-1A
- Sentinel-1B
- Sentinel-2
- Sentinel-2A
- Sentinel-2B
- Sentinel-3
- Sentinel-3A
- Sentinel-3B
- Sentinel-4
- Sentinel-5
- Sentinel-6 Michael Freilich
- Sentinels novels
- Sentry (AUV)
- Sentry (monitoring system)
- Seoul International Fireworks Festival
- Sepideh (film)
- Seppo Mikkola
- September (Roman month)
- September equinox
- Septentrio
- Septic drain field
- Sequence (geology)
- Sequoia (supercomputer)
- Serac
- Seram boobook
- Seram masked owl
- Seraph
- Serbia
- Serbian Astronomical Journal
- Serbian folk astronomy
- Serbian names in space
- Serena Auñón-Chancellor
- Serena Viti
- Serenity (2005 film)
- Serenity (Firefly episode)
- Serenity (fictional spacecraft)
- Serenity (soundtrack)
- Serenity Chasma
- Serer creation myth
- Serge Brunier
- Sergei Aleksandrovich Zhukov
- Sergei Alexandrovich Zhevakin
- Sergei Korolev
- Sergei Krikalev
- Sergei Moshchenko
- Sergei Pankejeff
- Sergei Treshchov
- Sergei Vozovikov
- Sergei Winogradsky
- Sergey Belyavsky
- Sergey Blazhko
- Sergey Izotov
- Sergey Korsakov (cosmonaut)
- Sergey Ryazansky
- Sergey Volkov (cosmonaut)
- Seria Oil Field
- Sericitic alteration
- Series (stratigraphy)
- Serious Gaming
- Serious Sam's Bogus Detour
- Serkan Golge
- Sermilik Station
- Serpens
- Serpens South
- Serpens in Chinese astronomy
- Serpens-Aquila Rift
- Serpent Mound
- Serpent Mound crater
- Serpent's Reach
- Serpentine geometry plasma actuator
- Serpentine soil
- Serpukhov-15
- Serra Pelada (meteorite)
- Serra da Cangalha
- Serra do Divisor National Park
- Serrurier truss
- Sersic profile
- Servants of the Wankh
- Service module
- Service star
- Service structure
- Sesostris Rock
- Set (deity)
- Set and drift
- Set the Controls for the Heart of the Sun
- Setebos (moon)
- Seth Barnes Nicholson
- Seth Carlo Chandler
- Seth Meyers
- Seth Shostak
- Seth Ward (bishop of Salisbury)
- Sethanne Howard
- Sethus Calvisius
- SetiQuest
- Seto (train)
- Setting circles
- Settling
- Seungri
- Seuss (crater)
- Seven Balls
- Seven Lions
- Seven Nation Army
- Seven Seas
- Seven Sleepers
- Seven Stars, Holborn
- Seven Stars, West Kensington
- Seven of Nine
- Seveneves
- Sevenfold sun miracle
- Seventh Cambridge Survey
- Several Species of Small Furry Animals Gathered Together in a Cave and Grooving with a Pict
- Severe acute respiratory syndrome
- Severe acute respiratory syndrome coronavirus
- Severe acute respiratory syndrome coronavirus 2
- Severomuysky Range
- Severus Sebokht
- Sewage regulation and administration
- Sewage treatment
- Sewer alligator
- Sex & Fury
- Sex Olympics
- Sex Vixens from Space
- Sex effects of water pollution
- Sex in space
- Sex report film
- Sexagenary cycle
- Sexploitation film
- Sextans
- Sextans A
- Sextans B
- Sextans Dwarf Spheroidal
- Sextans in Chinese astronomy
- Sextant
- Sextant (astronomical)
- Sextilis
- Sexxx Dreams
- Seyed Kazem Alavipanah
- Seyfert (crater)
- Seyfert galaxy
- Seyfert's Sextet
- Seymchan (meteorite)
- Seymour Hess
- Seymour Liebergot
- Sfera (geodesy satellite)
- Sfera (satellite)
- Sfermion
- Sgoldstino
- Sgt. Frog
- Sh2-1
- Sh2-10
- Sh2-101
- Sh2-106
- Sh2-155
- Sh2-2
- Sh2-201
- Sh2-264
- Sh2-279
- Sh2-297
- Sh2-308
- Sh2-54
- Sh2-7
- Sh2-9
- Sha Po Lang
- Shabbethai Donnolo
- Shabbir Ahmad Rao
- Shabtai Ambron
- Shackleton (crater)
- Shackleton Energy Company
- Shadia Habbal
- Shadirvan
- Shadow Captain (novel)
- Shadow Dragon (aircraft)
- Shadow Matching
- Shadow Over Mars
- Shadow Squadron
- Shadow bands
- Shadow biosphere
- Shadow of Fear
- Shadow of the Comet
- Shadow square
- Shadow the Hedgehog (video game)
- Shadows (software)
- Shadows Linger
- Shadrach, Meshach, and Abednego
- Shaft (1971 film)
- Shaft in Africa
- Shaft's Big Score!
- Shag (film)
- Shahar (god)
- Shaheen-I
- Shaheen-II
- Shaheen-III
- Shahrazad (crater)
- Shahryar (crater)
- Shait
- Shaka era
- Shakashik (crater)
- Shakespeare (crater)
- Shakespeare (lunar crater)
- Shakespeare Inn, Bristol
- Shakespeare's Planet
- Shakuntala Devi
- Shalbatana Vallis
- Shaler (crater)
- Shalim
- Shallow (underwater relief)
- Shallow breathing
- Shallow sky
- Shallow water marine environment
- Shamakhy Astrophysical Observatory
- Shambhu Dayal Sinvhal
- Shambleau
- Shams (deity)
- Shams al-Din Abu Abd Allah al-Khalili
- Shams al-Din al-Khafri
- Shams al-Din al-Samarqandi
- Shane Black
- Shane Carruth
- Shane Davis (astrophysicist)
- Shane Kimbrough
- Shanghai Academy of Spaceflight Technology
- Shanghai Astronomical Observatory
- Shanghai International Music Fireworks Festival
- Shanghai Planetarium
- Shango Patera
- Shangri-La (Titan)
- Shani
- Shani Shingnapur
- Shannon Lucid
- Shannon Walker
- Shaolin Dolemite
- Shapash
- Shape of the universe
- Shape resonance
- Shapiro time delay
- Shapley (crater)
- Shapley 1
- Shapley Attractor
- Shapley Supercluster
- Shapley-Ames Catalog
- Shapley–Sawyer Concentration Class
- Sharad
- Sharaf al-Din al-Tusi
- Shards of Honor
- ShareSpace foundation
- Shark tourism
- Sharksploitation
- Sharon Aarons
- Sharon Needles
- Sharon Robinson (scientist)
- Sharonov (Martian crater)
- Sharonov (lunar crater)
- Sharp (crater)
- Sharp Edge Flight Experiment
- Sharp series
- Sharp-Apollo (crater)
- Sharpless 2-88
- Sharpless catalog
- Sharra's Exile
- Sharrkan (crater)
- Sharyn McCrumb
- Sharyn November
- Shashikumar Chitre
- Shashthi (day)
- Shashtiamsa
- Shatabhisha
- Shatalov (crater)
- Shatter cone
- Shattered (Star Trek: Voyager)
- Shattered Dreams
- Shattered Horizon
- Shattered Image
- Shattered Mirror (Star Trek: Deep Space Nine)
- Shattered Planet
- Shattuck Observatory
- Shaukat Hameed Khan
- Shaun Cole
- Shaun M. Hughes
- Shaun Williams (DJ)
- Shavit 2 (sounding rocket)
- Shaw Prize
- Shawna McCarthy
- Shayera Hol
- Shayn (crater)
- Shcramjet
- She Came Home for Christmas
- She Demons
- She Don't Use Jelly
- She Freak
- She's a Superstar
- She-Devils on Wheels
- She-Ra and the Princesses of Power
- She-Ra: Princess of Power
- Shea's Performing Arts Center
- Shear (geology)
- Shear velocity
- Shear wave splitting
- Shear zone
- Shearing interferometer
- Sheba, Baby
- Sheep (song)
- Sheep, Dog 'n' Wolf
- Sheepshanks (crater)
- Sheepshanks equatorial
- Sheex
- Sheikh Muszaphar Shukor
- Sheila Kanani
- Sheila Williams
- Shelf ice
- Shelia Nash-Stevenson
- Shell collapsar
- Shell grit
- Shell grotto
- Shell star
- Shell theorem
- Shelley Ackerman
- Shelley von Strunckel
- Shelley's Laserdome
- Shellworld
- Shelter Island meteorite
- Shen Kuo
- Shenandoah (B&O train)
- Shenmue (TV series)
- Shenzhou (spacecraft)
- Shenzhou 1
- Shenzhou 10
- Shenzhou 11
- Shenzhou 12
- Shenzhou 2
- Shenzhou 3
- Shenzhou 4
- Shenzhou 5
- Shenzhou 6
- Shenzhou 7
- Shenzhou 8
- Shenzhou 9
- Shenzhou program
- Shepard's Prayer
- Sheperd S. Doeleman
- Shepherd moon
- Shepherd's dial
- Shequida
- Sher 25
- Sher-Gil (crater)
- Sherburne Wesley Burnham
- Sheree Thomas
- Shergotty meteorite
- Sherlock (crater)
- Sherman Billingsley
- Sherrington (crater)
- Sherry Vine
- Sherwood C. Spring
- Sheshan Observatory
- Shetland Space Centre
- Shewanella sediminis
- Sheyene Gerardi
- Shi (personator)
- Shi Nguyen-Kuok
- Shi Shen (crater)
- Shi Yafeng
- Shi'b
- Shielded metal arc welding
- Shielding gas
- Shields parameter
- Shiera Sanders Hall
- Shift plan
- Shift work
- Shift work sleep disorder
- Shift-and-add
- Shigeru Inoda
- Shigeru Nakayama
- Shijian 11-01
- Shijian 13
- Shikasta
- Shikoku Facula
- Shimoni bat lyssavirus
- Shin'en (spacecraft)
- Shin'ichi Nojiri
- Shindig (Firefly)
- Shine On You Crazy Diamond
- Shingle beach
- Shining Darkness (novel)
- Shinkansen (collective)
- Shinya Kumazaki
- Ship of Fools (Russo novel)
- Shipka (military base)
- Shipwright's Arms Hotel
- Shirakatsi (crater)
- Shirin (crater)
- Shirley Ho
- Shirley Thomas (USC professor)
- Shirshov Institute of Oceanology
- Shishir
- Shishira
- Shiv Ramdas
- Shiva Hypothesis
- Shiva crater
- Shiva laser
- Shivini
- Shoal
- Shock metamorphism
- Shock waves in astrophysics
- Shocked quartz
- Shocking Asia
- Shocking Asia II: The Last Taboos
- Shocks and discontinuities (magnetohydrodynamics)
- Shocktoberfest
- Shockwave (Star Trek: Enterprise)
- Shoemaker (lunar crater)
- Shoemaker crater
- Shoggoth
- Shogun's Joys of Torture
- Shohini Ghose
- Sholem Aleichem (crater)
- Shonkin Sag
- Shoo Fly Complex
- Shoom
- Shoot the Runner
- Shops at Rivercenter
- Shore
- Shore Leave (Star Trek: The Original Series)
- ShoreZone
- Shoreline Fault
- Short (crater)
- Short baseline acoustic positioning system
- Short supermultiplet
- Short-term exposure limit
- Shortridge's long-fingered bat
- Shorty (crater)
- Shosanbetsu Observatory
- Shoshonite
- Shot Down in the Night
- Shove ha'penny
- Show Me Love (film)
- Shpolskii matrix
- Shraavana
- Shravana
- Shrek the Third
- Shreveport-Bossier Astronomical Society
- Shrinivas Kulkarni
- Shrink–swell capacity
- Shrouds of the Night
- Shrub swamp
- Shternberg (crater)
- Shtil'
- Shuckburgh (crater)
- Shuckburgh telescope
- Shuguang (spacecraft)
- Shukra
- Shukrayaan-1
- Shul-pa-e
- Shuleykin (crater)
- Shun-ei Izumikawa
- Shunak crater
- Shusei Nagaoka
- Shut the Box
- Shutdown of thermohaline circulation
- Shutter Island
- Shutter ridge
- Shuttle (video game)
- Shuttle Amateur Radio Experiment
- Shuttle Avionics Integration Laboratory
- Shuttle Carrier Aircraft
- Shuttle Down
- Shuttle Landing Facility
- Shuttle Mission Simulator
- Shuttle Radar Topography Mission
- Shuttle Training Aircraft
- Shuttle pallet satellite
- Shuttle-C
- Shuttle-Centaur
- Shuttle-derived vehicle
- Shuttlecraft
- Shuttle–Mir program
- Shwartzman phenomenon
- Shōhei Suzuki
- SiRF
- SiRFstarIII
- SiReNT
- Sial
- Siarnaq
- Siau scops owl
- Siberian Research Institute of Geology, Geophysics and Mineral Resources
- Siberian Solar Radio Telescope
- Sibirjak
- Sibt al-Maridini
- Sibu (crater)
- Sich-1
- Sich-1M
- Sick Building
- Sid Meier's Alpha Centauri
- Sid Meier's Starships
- Sid Wilson
- Siddons Patera
- Side looking airborne radar
- Side valley
- Sidera Lodoicea
- Sidereal and tropical astrology
- Sidereal time
- Sidereal year
- Sidereus Nuncius
- Sidewalk astronomy
- Sidewinder Raven
- Siding Spring 2.3 m Telescope
- Siding Spring Survey
- Sidney C. Wolff
- Sidney Clark
- Sidney Coleman
- Sidney Dean Townley
- Sidney Hill Cottage Homes
- Sidney M. Gutierrez
- Sidney Powers Memorial Award
- Sidney Wilcox McCuskey
- Sidney William Wooldridge
- Sidney van den Bergh
- Siduri
- Sidus Ludoviciana
- Sied van Riel
- Siedentopf (crater)
- Siegbahn notation
- Siege of the Saxons
- Siegenian
- Siegi Sessler
- Siek (landform)
- Sienna X
- Sierd Cloetingh
- Sierpinski (crater)
- Sierra (supercomputer)
- Sierra Madera crater
- Sierra Madre Occidental
- Sierra Madre Oriental
- Sierra Madre del Sur
- Sierra Nevada Corporation
- Sierra Nevada Observatory
- Siesta
- Sif Mons
- Sig Mejdal
- Siggie Nordstrom
- Sight reduction
- Sigismund von Braun
- Sigma (cosmology)
- Sigma Andromedae
- Sigma Aquarii
- Sigma Aquilae
- Sigma Arae
- Sigma Arietis
- Sigma Aurigae
- Sigma Boötis
- Sigma Cancri
- Sigma Canis Majoris
- Sigma Capricorni
- Sigma Cassiopeiae
- Sigma Centauri
- Sigma Ceti
- Sigma Columbae
- Sigma Coronae Borealis
- Sigma Cygni
- Sigma Draconis
- Sigma Gamma Epsilon
- Sigma Geminorum
- Sigma Gruis
- Sigma Herculis
- Sigma Hydrae
- Sigma Hydrids
- Sigma Leonis
- Sigma Librae
- Sigma Lupi
- Sigma Octantis
- Sigma Ophiuchi
- Sigma Orionis
- Sigma Pegasi
- Sigma Persei
- Sigma Piscium
- Sigma Puppis
- Sigma Sagittarii
- Sigma Scorpii
- Sigma Sculptoris
- Sigma Serpentis
- Sigma Tauri
- Sigma Ursae Majoris
- Sigma Virginis
- Sigma coordinate system
- Sigma-D relation
- Sigma1 Cancri
- Sigma1 Gruis
- Sigma1 Ursae Majoris
- Sigma2 Cancri
- Sigma2 Gruis
- Sigma2 Ursae Majoris
- Sigma3 Cancri
- SigmaPlot
- Sigmar Wittig
- Sigmodal
- Signal (Twice song)
- Signal Hill Group
- Signs (film)
- Signs Of LIfe Detector
- Signs of Life (instrumental)
- Sigurd Einbu
- Sigurður Þórarinsson
- Sihtu Planitia
- Sikhote-Alin meteorite
- Sikorsky (crater)
- Silane
- Silberschlag (crater)
- Silbervogel
- Silcrete
- Silene noctiflora
- Silene nutans
- Silent Madness
- Silent Night, Deadly Night
- Silent Running
- Silentnight
- Silesian Planetarium
- Silewe Nazarata
- Siliceous dinoflagellate cysts
- Siliceous ooze
- Siliceous soil
- Silicon-burning process
- Silicon-vacancy center in diamond
- Silicone impregnated refractory ceramic ablator
- Siliconia
- Silip
- Siljan (lake)
- Siljan Ring
- Silke Ackermann
- Sillar
- Silo (library)
- Silpheed: The Lost Planet
- Silpium Mons
- Silt
- Silt fence
- Siltation
- Silurian hypothesis
- Silvanus (mythology)
- Silver Comet (train)
- Silver Ghost (public house)
- Silver Machine
- Silver Meteor
- Silver Star (Amtrak train)
- Silver Surfer
- SilverHawks
- Silversands
- Silvia Maciá
- Silvia Torres-Peimbert
- Silvo Breskvar
- Sima (geology)
- Simba Sleep
- Simeis 147
- Simeiz Observatory
- Simeiz Vallis
- Simeon Monument
- Simeulue scops owl
- Siming (deity)
- Simmias of Thebes
- Simois Colles
- Simon Borrows
- Simon Bredon
- Simon Conway Morris
- Simon F. Green
- Simon Lilly
- Simon Marius
- Simon Mitton
- Simon Newcomb
- Simon Pegg
- Simon Ramo
- Simon Ratcliffe (astronomer)
- Simon Rex
- Simon Stevin
- Simon Stålenhag
- Simon White
- Simon, King of the Witches
- Simone Zaggia
- Simons Observatory
- Simpelius (crater)
- Simple Ocean Data Assimilation
- Simplicius of Cilicia
- Simplified Aid For EVA Rescue
- Simplified perturbations models
- Simply Local
- Simpson's Tavern
- Simud Valles
- Simulated fluorescence process algorithm
- Simulation Model Portability
- Simulation-to-Flight 1
- Simultaneous perturbation stochastic approximation
- Sin (mythology)
- Sina-1
- Sinan (crater)
- Sinan ibn Thabit
- Sinas (crater)
- Sinbad (comedian)
- Sind ibn Ali
- Sindbad (crater)
- Sine Mora
- Sine quadrant
- Sing for Absolution
- Singapore Fireworks Celebrations
- Singing Stones of Brittany
- Single colour reflectometry
- Single-molecule experiment
- Single-person spacecraft
- Single-scattering albedo
- Single-shot multi-contrast X-ray imaging
- Single-stage-to-orbit
- Singlet fission
- Singular isothermal sphere profile
- Singularity Sky
- Sinistar
- Sinking cities
- Sinlap
- Sino Satellite Communications
- Sinop (crater)
- Sinope (moon)
- Sins of a Solar Empire
- Sintana (crater)
- Sinton (crater)
- Sinus Aestuum
- Sinus Amoris
- Sinus Asperitatis
- Sinus Concordiae
- Sinus Fidei
- Sinus Honoris
- Sinus Iridum
- Sinus Lunicus
- Sinus Medii
- Sinus Roris
- Sinus Sabaeus quadrangle
- Sinus Successus
- Sinusoidal plane-wave solutions of the electromagnetic wave equation
- Sionascaig Lacus
- Sioux (train)
- Sippewissett microbial mat
- Sir Arthur Clarke Award
- Sir Charles Yate, 1st Baronet
- Sir Graves Ghastly
- Sir Harold of Zodanga
- Sir Henry's
- Sir Richard Gregory, 1st Baronet
- Sir Thomas Brisbane Planetarium
- Sir William Congreve, 2nd Baronet
- Sirena Deep
- Sirenum Fossae
- Siril (software)
- Siriometer
- Sirius
- Sirius FM-1
- Sirius FM-2
- Sirius FM-3
- Sirius FM-5
- Sirius XM
- Sirius in fiction
- Sirsalis (crater)
- Sisakyan (crater)
- Sisebut
- Sister Bliss
- Sister Catherine Treatise
- Sisterhood of Dune
- Sisters of the Sun
- Sisyphi Montes
- Site A/Plot M Disposal Site
- Site-directed spin labeling
- Siti Aisyah Alias
- Sitka (crater)
- Sitnikov problem
- Siton Undae
- Sivakasi factory explosion
- Six Flags Fright Fest
- Sixth Cambridge Survey of Radio Sources
- Sixth principal meridian
- Sixto Paz Wells
- Size Strength classification
- Siṃha
- Sjur Refsdal
- Skadi Mons
- Skalnate Pleso Atlas of the Heavens
- Skalnaté pleso Observatory
- Skanda Hora
- Skaro
- Skathi (moon)
- Skcin computer tan hoax
- Skeksis
- Skeleton Warriors
- Skeleton Warriors (video game)
- Skeletor
- Skeptics in the Pub
- Skin cancer
- Skin flora
- Skin temperature (of an atmosphere)
- Skinakas (hypothetical basin)
- Skinakas Observatory
- Skinners Family Hotel
- Skipper (Red Dwarf)
- Skittles (sport)
- Skizz
- Sklodowska (Martian crater)
- Sklodowska (lunar crater)
- Skoll (moon)
- Skredkommissionen
- Skua (rocket)
- Skull and crossbones (symbol)
- Sky
- Sky & Telescope
- Sky Bow
- Sky Dragons
- Sky Galleons of Mars
- Sky Larks
- Sky Lift
- Sky Map
- Sky Masters
- Sky Muster
- Sky Polarization Observatory
- Sky and Space Global
- Sky brightness
- Sky island
- Sky quality meter
- Sky-Map.org
- Sky-Sailor
- Sky-Watch
- Sky-Watcher
- SkyCube
- SkyFire (spacecraft)
- SkyMapper
- SkySat
- SkyScout
- SkyTerra
- SkyWeek
- Skybolt (sounding rocket)
- Skyfire (Canberra)
- Skyfox II: The Cygnus Conflict
- Skyglobe
- Skyglow
- Skyhook (structure)
- Skyhook Wireless
- Skylab
- Skylab 2
- Skylab 3
- Skylab 4
- Skylab B
- Skylab II
- Skylab Medical Experiment Altitude Test
- Skylab Rescue
- Skylab controversy
- Skyland Special
- Skylark (rocket)
- Skylark (series)
- Skylark DuQuesne
- Skylark Three
- Skylark launch tower
- Skylark of Valeron
- Skyline (2010 film)
- Skylines (film)
- Skylon (spacecraft)
- Skynd (crater)
- Skynet (satellite)
- Skynet 5A
- Skynet 5B
- Skynet 5C
- Skynet 5D
- Skyrocket
- Skyroot Aerospace
- Skyrora
- Skystone
- Skytech
- Skywalker hoolock gibbon
- Skywave
- Skyway (Disney)
- Slab pull
- Slab window
- Slack water
- Slag (welding)
- Slaking (geology)
- Slang Faculae
- Slapper detonator
- Slate Islands (Ontario)
- Slater (crater)
- Slaughter (1972 film)
- Slaughter's Big Rip-Off
- Slaughtered Vomit Dolls
- Slaughterhouse-Five
- Slaughterhouse-Five (film)
- Slava (crater)
- Slava (lunar crater)
- Slaves of the Klau
- Slavic creation myth
- Sleep
- Sleep (1964 film)
- Sleep (album)
- Sleep (journal)
- Sleep Country Canada
- Sleep Happy
- Sleep Like a Tiger
- Sleep Little Girl
- Sleep Medicine Reviews
- Sleep No More (Doctor Who)
- Sleep Research Society
- Sleep Walk
- Sleep and breathing
- Sleep and creativity
- Sleep and emotions
- Sleep and learning
- Sleep and memory
- Sleep and metabolism
- Sleep and weight
- Sleep apnea
- Sleep cycle
- Sleep debt
- Sleep deprivation
- Sleep deprivation in higher education
- Sleep diary
- Sleep disorder
- Sleep disorder specialist
- Sleep emailing
- Sleep epidemiology
- Sleep hollow
- Sleep hygiene
- Sleep in bipolar disorder
- Sleep in fish
- Sleep in non-human animals
- Sleep in space
- Sleep induction
- Sleep inertia
- Sleep inversion
- Sleep medicine
- Sleep onset
- Sleep onset latency
- Sleep paralysis
- Sleep problems in women
- Sleep sex
- Sleep spindle
- Sleep state misperception
- Sleep study
- Sleep surgery
- Sleep-deprived driving
- Sleep-learning
- Sleep-related breathing disorder
- SleepBot
- Sleeper Either Class
- Sleeper ship
- Sleeping Beauty
- Sleeping Satellite
- Sleeping bag
- Sleeping bag liner
- Sleeping car
- Sleeping disorders following traumatic brain injury
- Sleeping pad
- Sleeping porch
- Sleeping positions
- Sleeping while on duty
- Sleepio
- Sleepover
- Sleepstalker
- Sleepwalkers (TV series)
- Sleepwalking
- Sleepwalking scene
- Sleepy Holler
- Sleepy Hollow (Mars)
- Sleepy-Time Squirrel
- Sleep–wake activity inventory
- Sleigh bed
- Slew (spacecraft)
- Slickenside
- Slide (geography)
- Slide Away (The Verve song)
- Slide away bed
- Sliders
- Sliding criterion (geotechnical engineering)
- Slime Rancher
- Slimelight
- Slip-Slop-Slap
- Slip-off slope
- Slipher (Martian crater)
- Slipher (lunar crater)
- Slippy Toad
- Slipstream (science fiction)
- Slitheen
- Slitless spectroscopy
- Sloan Digital Sky Survey
- Sloan Great Wall
- Slocum (crater)
- Slooh
- Slope-former
- Sloppy the Psychotic
- Slordax: The Unknown Enemy
- Sloshsat-FLEVO
- Slot canyon
- Slough (hydrology)
- Slovak Organisation for Space Activities
- Slovak Space Policy Association
- Slovakia
- Slow (DJ)
- Slow Life (novelette)
- Slow Wave
- Slow sand filter
- Slow-wave sleep
- Slowly pulsating B-type star
- Slug and Lettuce
- Slug and Lettuce, Islington
- Slug test
- Slugger Ann
- Slugs (autopilot system)
- Slump (geology)
- Slusnik Luna
- Smadar Naoz
- Small Astronomy Satellite 2
- Small Astronomy Satellite 3
- Small Dark Spot
- Small Deep Space Transponder
- Small Gods
- Small Magellanic Cloud
- Small Payload Quick Return
- Small Sagittarius Star Cloud
- Small Satellite Conference
- Small Satellite Program (United States Naval Academy)
- Small Solar System body
- Small Tight Aspect Ratio Tokamak
- Small Town Sheriff
- Small bent-winged bat
- Small mouse-tailed bat
- Small planet radius gap
- Small satellite
- Small telescope
- Small-angle X-ray scattering
- Small-angle neutron scattering
- Small-angle scattering
- Small-lift launch vehicle
- Smallville
- Smart Lander for Investigating Moon
- Smart mattress
- Smart onboard data interface module
- Smertrios
- Smile, Darn Ya, Smile!
- Smith (Martian crater)
- Smith (lunar crater)
- Smith Observatory
- Smith and Jones (Doctor Who)
- Smith's Cloud
- Smith's laws
- Smithson (crater)
- Smithsonian Astrophysical Observatory
- Smithsonian Astrophysical Observatory Star Catalog
- Smithsonian Theaters
- Smithsonian Transcription Center
- Smoke bomb
- Smokey Bites the Dust
- Smokey Hole Cave
- Smokin Jo
- Smokin' Guns
- Smoking Hills
- Smoky Mountains (Moon)
- Smoky bat
- Smoluchowski (crater)
- Smooth Talk
- Smooth Velvet, Raw Silk
- Smuggling tunnel
- Snake (zodiac)
- Snake Nebula
- Snake Valley Astronomical Association
- SnapTrack
- Snapback (electrical)
- Snapshot hyperspectral imaging
- Snctm (club)
- Sneden's Star
- Snellius (crater)
- Sniadecki (crater)
- Snježana Kordić
- Snob screen
- Snooker
- Snooper (Global Positioning System)
- Snoopy cap
- Snops Attack! Zombie Defense
- Snoring
- Snorri (crater)
- Snottite
- Snout Spout
- Snow King Observatory and Planetarium
- Snow bridge
- Snow field
- Snow hydrology
- Snow patch
- Snow patches in Scotland
- Snow science
- Snowden (song)
- Snowmelt
- Snows of Darkover
- Snuff (Pratchett novel)
- Soakage (source of water)
- Soap Bubble Nebula
- Sobkou Planitia
- Sobolev crater
- Social and Environmental Responsibility World Forum
- Social gravity
- Sociedad Geológica del Perú
- Sociedade Astronômica Brasileira
- Society for Applied Spectroscopy
- Society for Popular Astronomy
- Society for Research on Biological Rhythms
- Society for Sedimentary Geology
- Society for Studies of Interplanetary Travel
- Society for the History of Astronomy
- Society for the History of Discoveries
- Society of British Aerospace Companies
- Society of Cartographers
- Society of Economic Geologists
- Society of Environmental Toxicology and Chemistry
- Society of Satellite Professionals International
- Society of Vertebrate Paleontology
- Socio-hydrology
- Socioecology
- Sociomapping
- Société astronomique de France
- Société d'astronomie de Montréal
- Société d'étude et de réalisation d'engins balistiques
- Soddy (crater)
- Sodium adsorption ratio
- Sodium bicarbonate rocket
- Sodium fluoroacetate
- Sodium layer
- Sodium oxybate
- Sodium tail of the Moon
- Sodium thiopental
- Sodium-vapor lamp
- Sods
- Sofa bed
- Sofar bomb
- Sofia Feltzing
- Sofia Romanskaya
- Soft SUSY breaking
- Soft X-ray transient
- Soft gamma repeater
- Soft landing (aeronautics)
- Software (novel)
- Sohae Satellite Launching Station
- Sohla
- Soichi Noguchi
- Soil
- Soil Biology and Biochemistry
- Soil Dryness Index
- Soil Health Card Scheme
- Soil Moisture Active Passive
- Soil Moisture and Ocean Salinity
- Soil Research
- Soil Resource Development Institute
- Soil Science Society of America
- Soil Science Society of Poland
- Soil Use Efficiency
- Soil acidification
- Soil aggregate stability
- Soil biodiversity
- Soil bioengineering
- Soil biology
- Soil biomantle
- Soil carbon
- Soil carbon feedback
- Soil chemistry
- Soil classification
- Soil color
- Soil compaction
- Soil compaction (agriculture)
- Soil conditioner
- Soil conservation
- Soil contamination
- Soil crust
- Soil ecology
- Soil erosion
- Soil fertility
- Soil food web
- Soil functions
- Soil gas
- Soil governance
- Soil guideline value
- Soil health
- Soil horizon
- Soil in Atsbi Wenberta
- Soil in Dogu'a Tembien
- Soil in Inderta
- Soil in Kilte Awula'ilo
- Soil in Kola Tembien
- Soil in Sa'isi Tsa'ida Imba
- Soil in Tanqwa Abergele
- Soil inference system
- Soil life
- Soil liquefaction
- Soil loss tolerance
- Soil management
- Soil map
- Soil matrix
- Soil mesofauna
- Soil microbiology
- Soil moisture sensor
- Soil moisture velocity equation
- Soil moisture zone
- Soil morphology
- Soil pH
- Soil physics
- Soil plant atmosphere continuum
- Soil production function
- Soil quality
- Soil regeneration
- Soil resilience
- Soil respiration
- Soil salinity
- Soil salinity control
- Soil science
- Soil series
- Soil sloughing
- Soil solarization
- Soil stabilization
- Soil steam sterilization
- Soil structure
- Soil survey
- Soil test
- Soil texture
- Soil thermal properties
- Soil type
- Soil value
- Soil water (retention)
- Soil zoology
- Soil-adjusted vegetation index
- Soiling (solar energy)
- Sojourner (rover)
- Sokoke scops owl
- Sokol Eshelon
- Sokol space suit
- Sokolov–Ternov effect
- Sol (Roman mythology)
- Sol (day on Mars)
- Sol Bianca
- Sol Invictus
- Sola Fide Observatory
- Solander Point
- Solapuri chaddar
- Solar Anomalous and Magnetospheric Particle Explorer
- Solar Assault
- Solar Attack
- Solar Crisis (film)
- Solar Cruiser
- Solar Dynamics Observatory
- Solar Eclipse (video game)
- Solar Eclipse Maestro
- Solar Energy (journal)
- Solar Energy Materials and Solar Cells
- Solar Jetman
- Solar Maximum Mission
- Solar Mesosphere Explorer
- Solar Observatory Tower Meudon
- Solar Observing Optical Network
- Solar Orbiter
- Solar Physics (journal)
- Solar Pyramid
- Solar Radiation and Climate Experiment
- Solar Science
- Solar Sentinels
- Solar Shade Control Act
- Solar Submillimeter Telescope
- Solar System
- Solar System (song)
- Solar System Ambassadors
- Solar System Research
- Solar System in fiction
- Solar System model
- Solar Terrestrial Probes program
- Solar Wind Composition Experiment
- Solar X-ray Imager
- Solar air heat
- Solar analog
- Solar and Heliospheric Observatory
- Solar apex
- Solar augmented geothermal energy
- Solar azimuth angle
- Solar barque
- Solar bonds
- Solar calendar
- Solar combisystem
- Solar conjunction
- Solar constant
- Solar core
- Solar coverage rate
- Solar cycle
- Solar cycle (calendar)
- Solar cycle 11
- Solar cycle 12
- Solar cycle 13
- Solar cycle 14
- Solar cycle 15
- Solar cycle 16
- Solar cycle 17
- Solar cycle 18
- Solar cycle 19
- Solar cycle 20
- Solar cycle 21
- Solar cycle 3
- Solar cycle 4
- Solar cycle 5
- Solar cycle 6
- Solar cycle 7
- Solar cycle 8
- Solar cycle 9
- Solar deity
- Solar dryer
- Solar dynamo
- Solar eclipse
- Solar eclipse of April 13, 1801
- Solar eclipse of August 17, 1803
- Solar eclipse of August 21, 2017
- Solar eclipse of August 28, 1802
- Solar eclipse of August 28, 1848
- Solar eclipse of February 11, 1804
- Solar eclipse of February 21, 1803
- Solar eclipse of March 14, 1801
- Solar eclipse of March 4, 1802
- Solar eclipse of May 25, 1808
- Solar eclipse of May 29, 1919
- Solar eclipse of October 7, 1801
- Solar eclipse of September 8, 1801
- Solar eclipses in fiction
- Solar eclipses on Jupiter
- Solar eclipses on Mars
- Solar eclipses on Neptune
- Solar eclipses on Saturn
- Solar eclipses on Uranus
- Solar eclipses on the Moon
- Solar electric propulsion
- Solar energetic particles
- Solar energy
- Solar equator
- Solar flare
- Solar flux unit
- Solar gain
- Solar geoengineering
- Solar gravitational lens
- Solar heat collector and radiator for building roof
- Solar hydrogen panel
- Solar irradiance
- Solar longitude
- Solar luminosity
- Solar mass
- Solar maximum
- Solar minimum
- Solar module quality assurance
- Solar neon
- Solar neutrino
- Solar neutrino problem
- Solar observation
- Solar observatory
- Solar panels on spacecraft
- Solar particle event
- Solar phenomena
- Solar physics
- Solar power
- Solar power in Armenia
- Solar prominence
- Solar radius
- Solar rotation
- Solar sail
- Solar simulator
- Solar storm
- Solar storm of 2012
- Solar storm of August 1972
- Solar street light
- Solar symbol
- Solar telescope
- Solar time
- Solar tower (astronomy)
- Solar tracker
- Solar transit
- Solar transition region
- Solar variability
- Solar viewer
- Solar water disinfection
- Solar wind
- Solar zenith angle
- Solar-like oscillations
- Solaris (1968 film)
- Solaris (1972 film)
- Solaris (2002 film)
- Solaris (novel)
- Solaris (video game)
- Solarium (constellation)
- Solarium Augusti
- Solarization (physics)
- Solarquest
- Solarroller
- Soldier (1998 American film)
- Soldiers Inc.
- Soldiers of the Empire
- Solemyidae
- Solfilmen
- Solid Earth (journal)
- Solid Space
- Solid earth
- Solid image
- Solifluction
- Solis Lacus
- Solo operations of Apollo 15
- Solo: A Star Wars Story
- Solomon Gandz
- Solomon ben Elijah Sharbit
- Solomons boobook
- Solon Irving Bailey
- Solonchak
- Solonetz
- Solstice
- Solum
- Solumbra
- Solution precursor plasma spray
- Solutions of the Einstein field equations
- Solvatochromism
- Solving the geodesic equations
- Solwind
- Somak Raychaudhury
- Sombrero Galaxy
- Some of the Things That Molecules Do
- Somebody's Watching Me
- Someone's Rocking My Dreamboat (song)
- Somerset Space Walk
- Somerville (crater)
- Something Deeply Hidden
- Something Human
- Something Weird (film)
- Something Wicked This Way Comes (novel)
- Sometimes When I'm Dreaming
- Somewhere in Dreamland
- Sommerfeld (crater)
- Sommerfeld parameter
- Sommerfeld–Kossel displacement law
- Sommers–Bausch Observatory
- Somnath Bharadwaj
- Somniale Danielis
- Somniloquy
- Somnium (novel)
- Somnium Scipionis
- Somnolence
- Somnology
- Somnox Sleep Robot
- Somnus
- Son of Ghoul
- Son of Merlin
- Sona Movsesian
- Sonda (rocket)
- Sondra Marshak
- Sondrestrom Upper Atmospheric Research Facility
- Song of the Sea (2014 film)
- Song of the Sky Pacers
- Song of the hoe
- Songs of the Humpback Whale (album)
- Sonia Altizer
- Sonia Keys
- Sonic CD
- Sonic Colors
- Sonic Shuffle
- Sonic X
- Sonic black hole
- Sonic the Comic
- Sonic the Hedgehog (Archie Comics)
- Sonic the Hedgehog (TV series)
- Sonic the Hedgehog (film)
- SonicVision
- Sonique (musician)
- Sonja Barth
- Sonmiani (space facility)
- Sonneberg Observatory
- Sonnenborgh Observatory
- Sonnet (The Verve song)
- Sonny Carter
- Sonny Flood
- Sonny Rhodes
- Sono arsenic filter
- Sonoma State Observatory
- Sons a Witches
- Sons of Mars (Adventure Time)
- Sony α7S II
- Sony α7S III
- Sophia Brahe
- Sophia Lois Suckling
- Sophie Nowicki
- Sophie Sugar
- Sophie Warny
- Sophiornithidae
- Sophocles (crater)
- Sophus Tromholt
- Sopor (sleep)
- Sor Juana (crater)
- Sorceress of Castle Grayskull
- Soret peak
- Sormano Astronomical Observatory
- Sorority Girl
- Sorptivity
- Sorrow (Pink Floyd song)
- Sort sol
- Sos and Victoria Petrosyan
- Sosigenes (crater)
- Sosigenes of Alexandria
- Soterml
- Sothic cycle
- Sotion (Pythagorean)
- Sotonera Lacus
- Sotra Patera
- Soul Music (TV series)
- Soul Music (novel)
- Soul Quest Overdrive
- Soul Sacrifice (video game)
- Soul Soldier
- Soul Zodiac
- Soul cake
- Soulstar
- Sound (geography)
- Sound (nautical)
- Sound localization in owls
- Sound ranger
- Sound velocity probe
- Sounding rocket
- Source Direct
- Source counts
- Source function
- Source water protection
- Sourcery
- Souterrain
- South (Martian crater)
- South (lunar crater)
- South African Astronomical Observatory
- South African Geographical Journal
- South African Journal of Geology
- South African National Biodiversity Institute
- South African National Space Agency
- South Anuyi Ocean
- South Asia Satellite
- South Atlantic Anomaly
- South Coast Air Quality Management District
- South Downs Planetarium & Science Centre
- South Florida Science Center and Aquarium
- South Hamgyong Province
- South Magnetic Pole
- South Mail
- South Ossetia
- South Pacific Applied Geoscience Commission
- South Pole
- South Pole Telescope
- South Pole Wall
- South Pole–Aitken basin
- South Pole–Queen Maud Land Traverse
- South Ray (crater)
- South Sudan
- South Wind (train)
- Southampton Dock
- Southend Central Museum
- Southern African Large Telescope
- Southern Astrophysical Research Telescope
- Southern Aurora
- Southern Belle (KCS train)
- Southern California Earthquake Center
- Southern Crab Nebula
- Southern Delta Aquariids
- Southern Dispersal
- Southern Exposure (film)
- Southern Hemisphere
- Southern Hemisphere Auroral Radar Experiment
- Southern Launch
- Southern Local Supervoid
- Southern Ocean
- Southern Owl Nebula
- Southern Positioning Augmentation Network
- Southern Television broadcast interruption
- Southern Uplands Fault
- Southern Ural
- Southern celestial hemisphere
- Southern exposure (terminology)
- Southerner (U.S. train)
- Southernmost settlements
- Southland (train)
- Southland Astronomical Society
- Southland Astronomical Society Observatory
- Southwest Approaches
- Southwest Chief
- Southwest Limited (MILW train)
- Southwest Minnesota State University
- Southwestern Limited (IC train)
- Southwestern Limited (New York Central train)
- Soviet Deep Space Network
- Soviet Project K nuclear tests
- Soviet calendar
- Soviet communications ship SSV-33
- Soviet crewed lunar programs
- Soviet laser pistol
- Soviet rocketry
- Soviet ship Akademik Sergey Korolyov
- Soviet ship Kosmonavt Vladimir Komarov
- Soviet ship Kosmonavt Yuriy Gagarin
- Soviet space dogs
- Soviet space exploration history on Soviet stamps
- Soviet space program
- Soyuz (rocket family)
- Soyuz (rocket)
- Soyuz (spacecraft)
- Soyuz 1
- Soyuz 10
- Soyuz 11
- Soyuz 12
- Soyuz 13
- Soyuz 14
- Soyuz 15
- Soyuz 16
- Soyuz 17
- Soyuz 18
- Soyuz 2
- Soyuz 20
- Soyuz 21
- Soyuz 22
- Soyuz 23
- Soyuz 24
- Soyuz 25
- Soyuz 26
- Soyuz 27
- Soyuz 28
- Soyuz 29
- Soyuz 2A
- Soyuz 3
- Soyuz 30
- Soyuz 31
- Soyuz 32
- Soyuz 33
- Soyuz 34
- Soyuz 35
- Soyuz 36
- Soyuz 37
- Soyuz 38
- Soyuz 39
- Soyuz 4
- Soyuz 40
- Soyuz 5
- Soyuz 6
- Soyuz 7
- Soyuz 7K-L1
- Soyuz 7K-L1 No.4L
- Soyuz 7K-L1 No.5L
- Soyuz 7K-L1E
- Soyuz 7K-LOK
- Soyuz 7K-OK
- Soyuz 7K-OK No.1
- Soyuz 7K-OKS
- Soyuz 7K-ST No.16L
- Soyuz 7K-T
- Soyuz 7K-T No.39
- Soyuz 7K-TK
- Soyuz 7K-TM
- Soyuz 8
- Soyuz 9
- Soyuz GVK
- Soyuz Kontakt
- Soyuz MS
- Soyuz MS-01
- Soyuz MS-02
- Soyuz MS-03
- Soyuz MS-04
- Soyuz MS-05
- Soyuz MS-06
- Soyuz MS-07
- Soyuz MS-08
- Soyuz MS-09
- Soyuz MS-10
- Soyuz MS-11
- Soyuz MS-12
- Soyuz MS-13
- Soyuz MS-14
- Soyuz MS-15
- Soyuz MS-16
- Soyuz MS-17
- Soyuz MS-18
- Soyuz MS-19
- Soyuz MS-20
- Soyuz P
- Soyuz T-1
- Soyuz T-10
- Soyuz T-11
- Soyuz T-12
- Soyuz T-13
- Soyuz T-14
- Soyuz T-15
- Soyuz T-2
- Soyuz T-3
- Soyuz T-4
- Soyuz T-5
- Soyuz T-6
- Soyuz T-7
- Soyuz T-8
- Soyuz T-9
- Soyuz TM-1
- Soyuz TM-10
- Soyuz TM-11
- Soyuz TM-12
- Soyuz TM-13
- Soyuz TM-14
- Soyuz TM-15
- Soyuz TM-16
- Soyuz TM-17
- Soyuz TM-18
- Soyuz TM-19
- Soyuz TM-2
- Soyuz TM-20
- Soyuz TM-21
- Soyuz TM-22
- Soyuz TM-23
- Soyuz TM-24
- Soyuz TM-25
- Soyuz TM-26
- Soyuz TM-27
- Soyuz TM-28
- Soyuz TM-29
- Soyuz TM-3
- Soyuz TM-30
- Soyuz TM-31
- Soyuz TM-32
- Soyuz TM-33
- Soyuz TM-34
- Soyuz TM-4
- Soyuz TM-5
- Soyuz TM-6
- Soyuz TM-7
- Soyuz TM-8
- Soyuz TM-9
- Soyuz TMA
- Soyuz TMA-01M
- Soyuz TMA-02M
- Soyuz TMA-03M
- Soyuz TMA-04M
- Soyuz TMA-05M
- Soyuz TMA-06M
- Soyuz TMA-07M
- Soyuz TMA-08M
- Soyuz TMA-09M
- Soyuz TMA-1
- Soyuz TMA-10
- Soyuz TMA-10M
- Soyuz TMA-11
- Soyuz TMA-11M
- Soyuz TMA-12
- Soyuz TMA-12M
- Soyuz TMA-13
- Soyuz TMA-13M
- Soyuz TMA-14
- Soyuz TMA-14M
- Soyuz TMA-15
- Soyuz TMA-15M
- Soyuz TMA-16
- Soyuz TMA-16M
- Soyuz TMA-17
- Soyuz TMA-17M
- Soyuz TMA-18
- Soyuz TMA-18M
- Soyuz TMA-19
- Soyuz TMA-19M
- Soyuz TMA-2
- Soyuz TMA-20
- Soyuz TMA-20M
- Soyuz TMA-21
- Soyuz TMA-22
- Soyuz TMA-3
- Soyuz TMA-4
- Soyuz TMA-5
- Soyuz TMA-6
- Soyuz TMA-7
- Soyuz TMA-8
- Soyuz TMA-9
- Soyuz abort modes
- Soyuz at the Guiana Space Centre
- Soyuz carrier rocket monument
- Soyuz flight VS22
- Soyuz programme
- Soyuz-2-1v
- Soyuz-A
- Soyuz-B
- Soyuz-FG
- Soyuz-L
- Soyuz-M
- Soyuz-T
- Soyuz-TM
- Soyuz-U
- Soyuz-U2
- Soyuz-V
- Sozin's Comet
- Sołtan argument
- Sołtmany (meteorite)
- SpARCS1049+56
- Space & Upper Atmosphere Research Commission
- Space (2001 TV series)
- Space (Ibiza nightclub)
- Space (The X-Files)
- Space (miniseries)
- Space (novel)
- Space (video game)
- Space Academy
- Space Access Society
- Space Ace 21
- Space Act Agreement
- Space Activities Bill
- Space Adventure Cobra: The Movie
- Space Adventures
- Space Adventures Crew Dragon mission
- Space Age
- Space Applications Centre
- Space Apprentice
- Space Ark
- Space Atlas: Mapping the Universe and Beyond
- Space Based Space Surveillance
- Space Battle (video game)
- Space Battleship Yamato (2010 film)
- Space Battleship Yamato (fictional spacecraft)
- Space Battleship Yamato 2199: Odyssey of the Celestial Ark
- Space Brothers (manga)
- Space Buddies
- Space Cadet
- Space Cadets (TV series)
- Space Camp (United States)
- Space Camp Spain
- Space Camp Turkey
- Space Capsule Recovery Experiment
- Space Capsule Recovery Experiment II
- Space Cases
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- Space Chimps
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- Space Chimps 2: Zartog Strikes Back
- Space Chronicles
- Space Coast Next Generation Solar Energy Center
- Space Combat
- Space Command (France)
- Space Command (TV series)
- Space Communications Protocol Specifications
- Space Communications and Navigation Program
- Space Cop
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- Space Empires: Starfury
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- Space Fantasy – The Ride
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- Space Foundation
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- Space Impact
- Space Industries Incorporated
- Space Industry Act 2018
- Space Infrastructure Servicing
- Space Innovation and Development Center
- Space Innovation and Growth Team
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- Space Invaders
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- Space Invaders Get Even
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- Space Invaders Virtual Collection
- Space Is the Place
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- Space Lords
- Space Marine (Warhammer 40,000)
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- Space Mouse
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- Space Nation
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- Space Oddity
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- Space Patrol (1950 TV series)
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- Space Physics Archive Search and Extract
- Space Pilot 3000
- Space Pioneer Awards
- Space Pirate
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- Space Place at Carter Observatory
- Space Platform
- Space Poop Challenge
- Space Precinct
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- Space Quest
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- Space Race
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- Space Rangers 2: Dominators
- Space Relations
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- Space Research and Technology Institute
- Space Resource Exploration and Utilization Act of 2015
- Space Rider
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- Space Shuttle Mission 2007
- Space Shuttle Orbital Maneuvering System
- Space Shuttle Pathfinder
- Space Shuttle Project
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- Space Shuttle design process
- Space Shuttle external tank
- Space Shuttle launch countdown
- Space Shuttle orbiter
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- Space Shuttle: A Journey into Space
- Space Situational Awareness Programme
- Space Solar Power Exploratory Research and Technology program
- Space Solar Telescope
- Space Spartans
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- Space Station 13
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- Space Test Program
- Space Test and Training Range
- Space Tourism Society
- Space Tourists
- Space Trader
- Space Transport Corporation
- Space Travel (video game)
- Space Travelers: The Animation
- Space Truckers
- Space Truckin'
- Space Tug (novel)
- Space Variable Objects Monitor
- Space Vehicle Mockup Facility
- Space War 2000
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- Space Western
- Space adaptation syndrome
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- Space archaeology
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- Space elevator
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- Space elevators in fiction
- Space environment
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- Space food
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- Space jellyfish
- Space jurisdiction
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- Space law
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- Space marine
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- Space opera
- Space opera in Scientology
- Space physics
- Space pirate
- Space policy
- Space policy of the Barack Obama administration
- Space policy of the Donald Trump administration
- Space policy of the European Union
- Space policy of the George W. Bush administration
- Space policy of the United States
- Space probe
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- Space programme of Kenya
- Space propaganda
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- Space science in Estonia
- Space segment
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- Space stations and habitats in fiction
- Space suit
- Space sunshade
- Space technology
- Space telescope
- Space tether
- Space tether missions
- Space toilet
- Space tornado
- Space tourism
- Space trade
- Space traffic management
- Space travel using constant acceleration
- Space tribology
- Space tug
- Space vehicle
- Space vehicle launch preparation
- Space warfare
- Space warfare in fiction
- Space weapon
- Space weather
- Space weathering
- Space's Deepest Secrets
- Space-Based Infrared System
- Space-Men
- Space-based economy
- Space-based measurements of carbon dioxide
- Space-based radar
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- Space-themed music
- Space.com
- Space: 1889
- Space: 1999
- Space: Above and Beyond
- SpaceCamp
- SpaceCollective
- SpaceCub
- SpaceCube
- SpaceDev
- SpaceEngine
- SpaceHub Southeast
- SpaceIL
- SpaceLiner
- SpaceLoft XL
- SpaceMETA
- SpaceNews
- SpaceOps
- SpaceQuest
- SpaceShipOne
- SpaceShipOne flight 11P
- SpaceShipOne flight 13P
- SpaceShipOne flight 14P
- SpaceShipOne flight 15P
- SpaceShipOne flight 16P
- SpaceShipOne flight 17P
- SpaceShipThree
- SpaceShipTwo
- SpaceStationSim
- SpaceUp
- SpaceWire
- SpaceX
- SpaceX Axiom Space-1
- SpaceX COTS Demo Flight 1
- SpaceX COTS Demo Flight 2
- SpaceX CRS-1
- SpaceX CRS-10
- SpaceX CRS-11
- SpaceX CRS-12
- SpaceX CRS-13
- SpaceX CRS-14
- SpaceX CRS-15
- SpaceX CRS-16
- SpaceX CRS-17
- SpaceX CRS-18
- SpaceX CRS-19
- SpaceX CRS-2
- SpaceX CRS-20
- SpaceX CRS-21
- SpaceX CRS-22
- SpaceX CRS-23
- SpaceX CRS-24
- SpaceX CRS-25
- SpaceX CRS-3
- SpaceX CRS-4
- SpaceX CRS-5
- SpaceX CRS-6
- SpaceX CRS-7
- SpaceX CRS-8
- SpaceX CRS-9
- SpaceX Crew-1
- SpaceX Crew-2
- SpaceX Crew-3
- SpaceX Dragon
- SpaceX Dragon 2
- SpaceX Mars program
- SpaceX Red Dragon
- SpaceX South Texas launch site
- SpaceX Starship
- SpaceX reusable launch system development program
- Spaceballs
- Spacebit
- Spacebit Mission One
- Spaceborne Imaging Radar
- Spacebus
- Spacecom
- Spacecraft
- Spacecraft Atmosphere Monitor
- Spacecraft Bus (JWST)
- Spacecraft Event Time
- Spacecraft call signs
- Spacecraft cemetery
- Spacecraft charging
- Spacecraft design
- Spacecraft magnetometer
- Spacecraft naming
- Spacecraft propulsion
- Spacecraft thermal control
- Spaced Invaders
- Spaceflight
- Spaceflight (magazine)
- Spaceflight IC-1
- Spaceflight Industries
- Spaceflight Meteorology Group
- Spaceflight before 1951
- Spaceflight osteopenia
- Spaceflight participant
- Spaceflight radiation carcinogenesis
- Spaceguard
- Spacehounds of IPC
- Spacehunter: Adventures in the Forbidden Zone
- Spacelab
- Spacelords
- Spaceman (4 Non Blondes song)
- Spaceman (Babylon Zoo song)
- Spaceman (Harry Nilsson song)
- Spaceman (comics)
- Spaceplane
- Spaceport
- Spaceport America
- Spaceport Camden
- Spaceport Sweden
- Spacequake
- Spaceship Earth
- Spaceship Earth (detector)
- Spaceship Earth (sculpture)
- Spaceship Medic
- Spaceship to Saturn
- Spacesuits in fiction
- Spaceteam
- Spacetime symmetries
- Spacetime topology
- Spaceturk
- Spacewar!
- Spacewatch
- Spaceway
- Spaceway-1
- Spaceway-2
- Spaceway-3
- Spaceworthiness
- Spaghetti Western
- Spaghettification
- Spainsat
- Spainsat NG
- Spallanzani (Martian crater)
- Spallanzani (lunar crater)
- Spallation Neutron Source
- Spanish Astrobiology Center
- Spanish Fry
- Spanish National Observatory
- Spar (mineralogy)
- Spar Aerospace
- Spare Parts (video game)
- Spark (2016 film)
- Spark gap
- Spark plug
- Spark-gap transmitter
- Sparkie (satellite)
- Sparkle (1976 film)
- Sparkler
- Sparks in the Park
- Sparoair
- Sparta (rocket)
- Spartan Packet Radio Experiment
- Spartina alterniflora
- Spasim
- Spatial Data Transfer Standard
- Spatial analysis
- Spatial ecology
- Spatial reconnaissance
- Spatial scale
- Spatially offset Raman spectroscopy
- Spatiospectral scanning
- Speak to Me
- Speaker for the Dead
- Spearmint Rhino
- Special Astrophysical Observatory of the Russian Academy of Science
- Special School for Aeronautical and Spatial Medicine
- Special Sensor Ultraviolet Limb Imager
- Special Unit 2
- Special creation
- Special sensor microwave/imager
- Species II
- Species distribution
- Species distribution modelling
- Species pool
- Specific angular momentum
- Specific impulse
- Specific orbital energy
- Specific radiative intensity
- Specific storage
- Specific ultraviolet absorbance
- Specim
- Specimen: Unknown
- Speckle (interference)
- Speckle imaging
- Speckle masking
- Specola di Lucca
- Spectacle Theater
- Spectral Database for Organic Compounds
- Spectral G-index
- Spectral atlas
- Spectral bands
- Spectral density
- Spectral energy distribution
- Spectral flux density
- Spectral hole burning
- Spectral imaging
- Spectral index
- Spectral line
- Spectral line ratios
- Spectral line shape
- Spectral phase interferometry for direct electric-field reconstruction
- Spectral power distribution
- Spectral purity
- Spectral resolution
- Spectral sensitivity
- Spectral signature
- Spectral slope
- Spectro-Polarimetric High-Contrast Exoplanet Research
- Spectrochemistry
- Spectrochimica Acta Part A
- Spectrochimica Acta Part B
- Spectroelectrochemistry
- Spectrofluorometer
- Spectroheliograph
- Spectrohelioscope
- Spectrometer
- Spectrometer Telescope for Imaging X-rays
- Spectronic 20
- Spectrophotometry
- Spectroradiometer
- Spectroscopic notation
- Spectroscopic parallax
- Spectroscopy
- Spectrum Astro
- Spectrum analyzer
- Speculative evolution
- Speculum Astronomiae
- Speculum Britanniae
- Speed of gravity
- Speeding Up Time
- Spektr
- Spektr-M
- Spektr-R
- Spektr-RG
- Spektr-UV
- Speleogen
- Speleogenesis
- Speleology
- Speleoseismite
- Spelunky 2
- Spencer Jones (crater)
- Spent caustic
- Spermosphere
- Sperry Marine Northrop Grumman
- Sphaerotilus natans
- Sphere of fire
- Sphere of influence (astrodynamics)
- Sphere of influence (black hole)
- Spherical Earth
- Spherical astronomy
- Spherical geometry
- Spherical neutron polarimetry
- Spherically symmetric spacetime
- Spheroidal weathering
- Spheromak
- Sphingobacterium psychroaquaticum
- Sphingomonas
- Sphingomonas alpina
- Sphingomonas glacialis
- Sphingomonas psychrolutea
- Sphinx (satellite)
- Sphinx Observatory
- Sphuṭacandrāpti
- Spica
- Spice (oceanography)
- Spicule (solar physics)
- Spider (polarimeter)
- Spider Hill
- Spider Robinson
- Spider crater
- Spider-Man Unlimited
- Spidernaut
- Spiegeltent
- Spike Feresten
- Spike Spiegel
- Spill containment
- Spiller
- Spin casting (mirrors)
- Spin echo
- Spin label
- Spin polarization
- Spin tensor
- Spin-flip
- Spin-polarized electron energy loss spectroscopy
- Spin-stabilisation
- SpinLaunch
- Spindle (vehicle)
- Spindrift
- Spinning dust
- Spinturnicidae
- Spinturnix americanus
- Spira (Final Fantasy)
- Spiral galaxy
- Spiral ground heat exchanger
- Spirale
- Spire Global
- Spiribacter aquaticus
- Spiribacter curvatus
- Spiribacter roseus
- Spiribacter salinus
- Spiridon Gopčević
- Spirit (rover)
- Spirit Halloween
- Spirit Pub Company
- Spirit of Knoxville
- Spirit of Progress
- Spirit of St. Louis (train)
- Spirit of the Age
- Spirit of the Outback
- Spirit possession
- Spirit spouse
- Spirobarbital
- Spirochaeta americana
- Spiru Haret
- Spite plateau
- Spitteler (crater)
- Spitzer Infrared Nearby Galaxies Survey
- Spitzer Space Telescope
- Spitzer resistivity
- Spivy
- Splashdown
- Splatalogue
- Splinter (novel)
- Splinter of the Mind's Eye
- Split supersymmetry
- Splitting of the moon
- Spodic soil
- Spome
- Sponde
- Spook (crater)
- Spooked (The Office)
- Spookley the Square Pumpkin
- Spooky (Classics IV song)
- Spooky Buddies
- Spookyfish
- Spoopy
- Sporadic E propagation
- Spore (2008 video game)
- Spore Creatures
- Spore Hero
- Sporopollenin
- Sporosarcina pasteurii
- Sports Complex Meteor
- Spot Image
- Spot height
- Spotted wood owl
- Spotting scope
- Spread Eagle, Wandsworth
- Spring (hydrology)
- Spring Break (film)
- Spring Snow
- Spring Triangle
- Spring bloom
- Spring horizon
- Spring peeper
- Springwater meteorite
- Sprite (lightning)
- Sproul Observatory
- Spruce Woods Provincial Park
- Spur (lunar crater)
- Spur (topography)
- Spur and groove formation
- Spurr (crater)
- Sputnik (rocket)
- Sputnik 1
- Sputnik 2
- Sputnik 3
- Sputnik 40
- Sputnik 41
- Sputnik 99
- Sputnik Planitia
- Sputnik crisis
- Sputnik-1 EMC/EMI lab model
- Sputnix
- Sputter deposition
- Spörer (crater)
- Spörer's law
- Square Kilometre Array
- Square-up
- Squidbillies
- Squitter
- Sri Lanka Planetarium
- Sri Lanka bay owl
- Sri Lankan Astronomy and Astrophysics Olympiad
- Sriharikota
- Sriramachakra
- Srīpur (crater)
- St John Philby
- St Mark's Clock
- St Mary the Virgin, Mortlake
- St Paul's Tavern
- St Theresa's Independent State Grammar School for Girls (and Boys)
- St-Robert meteorite
- St. Crispin's Reef
- St. George (crater)
- St. George Theatre
- St. John (crater)
- St. Nick's Pub
- St. Thomas Observatory
- St. Tropez (self-tan brand)
- St. Vincent Beechey
- Stability of the Solar System
- Stabilized liquid membrane devices
- Stabilized soil mixing plant
- Stable map
- Stable-isotope probing
- Stac Fada Member
- Stacie Powell
- Stack (geology)
- Stacking velocity
- Stacy Mader
- Stacy McGaugh
- Stadius (crater)
- Staerkel Planetarium
- Staff (head) gauge
- Stafford Air & Space Museum
- Stafford Brothers
- Stag's Head, Hoxton
- Stage (hydrology)
- Stage (stratigraphy)
- Staged combustion cycle
- Staging area
- Stagnogley
- Stagnosol
- Stalin vs. Martians
- Stamatios Krimigis
- Stamford Center for the Arts
- Stampede
- Stan Dixon
- Stan Romanek
- Standard Fireworks
- Standard Fireworks (India)
- Standard Terminal Automation Replacement System
- Standard Thai Astrology Manual
- Standard Theatre (Toronto)
- Standard Uptake Fraction
- Standard asteroid physical characteristics
- Standard atmosphere (unit)
- Standard conditions for temperature and pressure
- Standard day
- Standard gravitational parameter
- Standard gravity
- Standard ruler
- Standard sea-level conditions
- Standard solar model
- Standard time
- Standardised Precipitation Evapotranspiration Index
- Standing Up in the Milky Way
- Standing on the shoulders of giants
- Stanford Dish
- Stanford E. Woosley
- Stanford Protocol
- Stanford torus
- Stanislav George Djorgovski
- Stanislav Kalesnik
- Stanisław Baranowski
- Stanley Arms, Eccles
- Stanley Branche
- Stanley Deser
- Stanley G. Love
- Stanley Industrial Alliance Stage
- Stanley Kubrick
- Stanley Miller Medal
- Stanley Schmidt
- Stanley Theater (Utica, New York)
- Stannern (meteorite)
- Stanovoy Range
- Stanton J. Peale
- Stanton T. Friedman
- Stanton Warriors
- Star
- Star (Chinese constellation)
- Star (classification)
- Star (glyph)
- Star 48
- Star Appeal (film)
- Star Begotten
- Star Born
- Star Bridge
- Star Bus
- Star Citizen
- Star City, Russia
- Star Command (1988 video game)
- Star Conflict
- Star Control
- Star Control 3
- Star Control II
- Star Control: Origins
- Star Cops
- Star Crusader
- Star Crystal
- Star Fire
- Star Fireworks
- Star Fleet (video game series)
- Star Fleet I: The War Begins
- Star Fleet II: Krellan Commander
- Star Fox
- Star Fox (1993 video game)
- Star Fox 2
- Star Fox 64
- Star Fox 64 3D
- Star Fox Adventures
- Star Fox Command
- Star Fox Guard
- Star Fox Zero
- Star Fox: Assault
- Star Gate (novel)
- Star Gazers
- Star Hotel, Balmain
- Star Ixiom
- Star Luster
- Star Maidens
- Star Names
- Star Ocean
- Star Ocean (video game)
- Star Ocean: Anamnesis
- Star Ocean: Blue Sphere
- Star Ocean: Integrity and Faithlessness
- Star Ocean: The Last Hope
- Star Ocean: The Second Story
- Star Ocean: Till the End of Time
- Star Odyssey
- Star One B4
- Star One C1
- Star One C12
- Star One C2
- Star One C3
- Star One C4
- Star One D1
- Star Party Sri Lanka
- Star Pilot
- Star Prophecy
- Star Quest 1 in the 27th century
- Star Raiders
- Star Raiders (2011 video game)
- Star Raiders II
- Star Raiders: The Adventures of Saber Raine
- Star Rangers
- Star Rangers (novel)
- Star Rangers (video game)
- Star Runners
- Star Saga One: Beyond the Boundary
- Star Ship
- Star Smashers of the Galaxy Rangers
- Star Sonata
- Star Tavern, Belgravia
- Star Thrust Experiment
- Star Tours
- Star Tours – The Adventures Continue
- Star Trader
- Star Trek
- Star Trek (DC Comics)
- Star Trek (IDW Publishing)
- Star Trek (comics)
- Star Trek (film)
- Star Trek (novel)
- Star Trek Beyond
- Star Trek DAC
- Star Trek Fleet Command
- Star Trek II: The Wrath of Khan
- Star Trek III.4
- Star Trek III: The Search for Spock
- Star Trek Log (book series)
- Star Trek Online
- Star Trek Timelines
- Star Trek V: The Final Frontier
- Star Trek spin-off fiction
- Star Trek vs. Transformers
- Star Trek/Green Lantern
- Star Trek/Green Lantern: Stranger Worlds
- Star Trek/Planet of the Apes: The Primate Directive
- Star Trek/X-Men
- Star Trek: 25th Anniversary (computer game)
- Star Trek: A Time to...
- Star Trek: Armada
- Star Trek: Armada II
- Star Trek: Assignment: Earth
- Star Trek: Away Team
- Star Trek: Borg
- Star Trek: Bridge Commander
- Star Trek: Bridge Crew
- Star Trek: Conquest
- Star Trek: Countdown
- Star Trek: Deep Space Nine
- Star Trek: Discovery
- Star Trek: Early Voyages
- Star Trek: Elite Force II
- Star Trek: Encounters
- Star Trek: Enterprise
- Star Trek: Insurrection
- Star Trek: Invasion
- Star Trek: Judgment Rites
- Star Trek: Khan
- Star Trek: Klingon
- Star Trek: Klingon Academy
- Star Trek: Klingon Empire
- Star Trek: Legacy
- Star Trek: Nero
- Star Trek: New Earth
- Star Trek: New Frontier
- Star Trek: New Worlds
- Star Trek: Rihannsu
- Star Trek: Section 31
- Star Trek: Shattered Universe
- Star Trek: Short Treks
- Star Trek: Starfleet Academy
- Star Trek: Starfleet Academy (comics)
- Star Trek: Starfleet Academy – Starship Bridge Simulator
- Star Trek: Starfleet Command
- Star Trek: Starfleet Command II: Empires at War
- Star Trek: Starfleet Command III
- Star Trek: Starfleet Command: Orion Pirates
- Star Trek: Stargazer
- Star Trek: Starship Creator
- Star Trek: Starship Creator Warp II
- Star Trek: Tactical Assault
- Star Trek: The Experience
- Star Trek: The Lost Era
- Star Trek: The Manga
- Star Trek: The Motion Picture
- Star Trek: The Next Generation
- Star Trek: The Next Generation (season 1)
- Star Trek: The Next Generation (season 2)
- Star Trek: The Next Generation (season 3)
- Star Trek: The Next Generation (season 4)
- Star Trek: The Next Generation (season 5)
- Star Trek: The Next Generation (season 6)
- Star Trek: The Next Generation (season 7)
- Star Trek: The Next Generation – A Final Unity
- Star Trek: The Next Generation/Doctor Who: Assimilation2
- Star Trek: The Original Series
- Star Trek: The Promethean Prophecy
- Star Trek: Titan
- Star Trek: Typhon Pact
- Star Trek: Vanguard
- Star Trek: Voyager
- Star Trek: Year Four
- Star Voyager (Atari 2600)
- Star Walk
- Star Warped
- Star Wars
- Star Wars (1977 comic book)
- Star Wars (2015 comic book)
- Star Wars (UK comics)
- Star Wars (comic strip)
- Star Wars (manga)
- Star Wars Battle Pod
- Star Wars Battlefront (2015 video game)
- Star Wars Battlefront II (2017 video game)
- Star Wars Chess
- Star Wars Combine
- Star Wars Commander
- Star Wars Episode I: The Gungan Frontier
- Star Wars Galaxies
- Star Wars Hyperspace Mountain
- Star Wars Imperial Commando: 501st
- Star Wars Infinities
- Star Wars Jedi: Fallen Order
- Star Wars Journal: Captive to Evil
- Star Wars Journal: Hero for Hire
- Star Wars Journal: The Fight for Justice
- Star Wars Knights of the Old Republic II: The Sith Lords
- Star Wars Legends: Ambush at Corellia
- Star Wars MUSH
- Star Wars Math: Jabba's Game Galaxy
- Star Wars Racer Revenge
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- Stark spectroscopy
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- Starkers!
- Starkiller
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- Starlink
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- Starobinsky inflation
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- Stars and planetary systems in fiction
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- Stars!
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- Starship Troopers: Traitor of Mars
- Starship development history
- Starship: Apocalypse
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- Starsiege
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- Start school later movement
- Startide Rising
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- Starwisp
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- Static universe
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- Stationfall
- Statistical Accounts of Scotland
- Statite
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- Stawell Underground Physics Laboratory
- Steady-state economy
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- Steam
- Steam Packet Inn, Ipswich
- Steam-assisted gravity drainage
- Steamin' Billy
- Stearns (crater)
- Steatonyssus
- Stebbins (crater)
- Stebbins–Whitford effect
- Steele Savage
- Steen River crater
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- Stefan (crater)
- Stefan Eichinger
- Stefan's equation
- Stefania (crater)
- Stefano Cristiani
- Stefano Sposetti
- Stefi Baum
- Steilhang
- Stein (lunar crater)
- Stein 2051
- Steiner-Optik
- Steinhaus longimeter
- Steinheil (crater)
- Steinheim (Martian crater)
- Steinheim crater
- Steklov (crater)
- Stella (crater)
- Stella d'Italia
- Stellafane
- Stellar Dawn
- Stellar Track
- Stellar aberration (derivation from Lorentz transformation)
- Stellar age estimation
- Stellar archaeology
- Stellar association
- Stellar atmosphere
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- Stellar chemistry
- Stellar classification
- Stellar collision
- Stellar constellations in fiction
- Stellar core
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- Stellar density
- Stellar designations and names
- Stellar drift
- Stellar dynamics
- Stellar engine
- Stellar engineering
- Stellar evolution
- Stellar halo
- Stellar isochrone
- Stellar kinematics
- Stellar magnetic field
- Stellar mass
- Stellar mass loss
- Stellar nucleosynthesis
- Stellar parallax
- Stellar population
- Stellar pulsation
- Stellar rotation
- Stellar structure
- Stellar triangulation
- Stellar wind
- Stellar-wind bubble
- Stellaris (video game)
- Stellarium
- Stellarium (software)
- Stellification
- Stellvia
- Stemflow
- Sten Odenwald
- Stennis Space Center
- Steno (Martian crater)
- Steno (lunar crater)
- Steno Medal
- Steno-Apollo
- Stephan Martinière
- Stephan's Quintet
- Stephanie Birkitt
- Stephanie C. Werner
- Stephanie Hansen
- Stephanie Snedden
- Stephanie Wilson
- Stephano (moon)
- Stephanus of Alexandria
- Stephen Alexander (astronomer)
- Stephen Bowen (astronaut)
- Stephen Carkeek
- Stephen Colbert
- Stephen Colbert at the 2006 White House Correspondents' Dinner
- Stephen Eales
- Stephen Fabian
- Stephen Frick
- Stephen Goldin
- Stephen Hawking
- Stephen Hawking in popular culture
- Stephen Hawking's Favorite Places
- Stephen Hawking's Universe
- Stephen Hawking: Master of the Universe
- Stephen Hickman
- Stephen J. Edberg
- Stephen J. Mackwell
- Stephen Joseph Perry
- Stephen King
- Stephen LaBerge
- Stephen P. Laurie
- Stephen P. Maran
- Stephen P. Synnott
- Stephen Peter Rigaud
- Stephen R. Kane
- Stephen Robinson
- Stephen S. Oswald
- Stephen Singer-Brewster
- Stephen Smartt
- Stephen Smith (aerospace engineer)
- Stephen Thorsett
- Stephen Warren (astronomer)
- Stephen Youll
- Stephenson 2
- Stephenson 2-18
- Stephon Alexander
- Steppe belt
- Steppic Biogeographic Region
- Stepsister from Planet Weird
- Ster Cinemas
- Stereo nightclub
- StereoHeroes
- Stereoautograph
- Stereoscopic spectroscopy
- Sterile neutrino
- Sterkh
- Sternberg Astronomical Institute
- Sternenbote
- Sternfeld (crater)
- Sterns Nightclub
- Sternwarte Sirius
- Sterope (star)
- Stetson (crater)
- Stetteria
- Steuart Campbell
- Steve "Silk" Hurley
- Steve (atmospheric phenomenon)
- Steve Allen
- Steve Aoki
- Steve Austin (character)
- Steve Baca
- Steve Bales
- Steve Blum
- Steve Boyett
- Steve Chappell
- Steve Ellis (comics)
- Steve Fossey
- Steve Gottlieb (amateur astronomer)
- Steve Green (journalist)
- Steve Hislop (footballer)
- Steve Hollenhorst
- Steve Isakowitz
- Steve Jurczyk
- Steve Lawler
- Steve Mac (house DJ)
- Steve MacLean (astronaut)
- Steve Mandel
- Steve McIntosh
- Steve Middleton
- Steve Paul
- Steve Pitchford
- Steve Porter (producer)
- Steve Rubell
- Steve Smooth
- Steve Squyres
- Steve Stiles
- Steve Trevor
- Steve Urkel
- Steven A. Benner
- Steven Balbus
- Steven Boggs
- Steven Brust
- Steven H Silver
- Steven Hawley
- Steven J. Dick
- Steven J. Ostro
- Steven Lindsey
- Steven Lisberger
- Steven M. Greer
- Steven R. Nagel
- Steven Rawlings
- Steven S. Vogt
- Steven Smith (astronaut)
- Steven Spielberg
- Steven Swanson
- Steven Taylor (Doctor Who)
- Steven Tingay
- Stevenson (crater)
- Stevie (Kasabian song)
- Stevinus (crater)
- Stew pond
- Stewart (crater)
- Stewart Nozette
- Stewart Raffill
- Stewart Sharpless
- Stiborius (crater)
- Stickney (crater)
- Sticky bead argument
- Stieg Larsson
- Stieglitz (crater)
- Stilbon (mythology)
- Still Breathing (film)
- Still There
- Stilt-owl
- Stimson Joseph Brown
- Stimulated Raman adiabatic passage
- Stimulated Raman spectroscopy
- Stingray Nebula
- Stingray Sam
- Stinkor
- Stirling radioisotope generator
- Stirrup protein domain
- Stishovite
- Stitch Encounter
- Stitch's Great Escape!
- Stitch's Supersonic Celebration
- Stitches (2012 film)
- Stjerneborg
- Stochastic electrodynamics
- Stock 16
- Stockert Radio Telescope
- Stockholm Observatory
- Stockholm Syndrome (Muse song)
- Stockpile stewardship
- Stoke Me a Clipper
- Stokes (Martian crater)
- Stokes (lunar crater)
- Stokes parameters
- Stokes shift
- Stokesville Observatory
- Stolen and missing Moon rocks
- Stoletov (crater)
- Stomach (Chinese constellation)
- Stomp rocket
- Stone (1974 film)
- Stone Cold (1991 film)
- Stone Mountain (30 Rock)
- Stone Soupercomputer
- Stone Wall (Australia)
- Stone industry
- Stone line
- Stone ship
- Stone stripe
- Stonegate Pub Company
- Stonehenge
- Stonehenge Aotearoa
- Stonehenge Archer
- Stonehenge Avenue
- Stonehenge Cursus
- Stonehenge Free Festival
- Stonehenge II
- Stonehenge Landscape
- Stonehenge Riverside Project
- Stonehenge in its landscape
- Stonehenge replicas and derivatives
- Stonehenge road tunnel
- Stonehenge, Avebury and Associated Sites
- Stonelayer
- Stoney (Martian crater)
- Stoney (lunar crater)
- Stonyhurst disks
- Stop (Pink Floyd song)
- Stop squark
- Stoping (geology)
- Stoplogs
- Storie index
- Stories to Remember
- Stork Club
- Storm (Don Lawrence)
- Storm (Marvel Comics)
- Storm Data
- Storm Front (Star Trek: Enterprise)
- Storm Over Warlock
- Storm cellar
- Storm drain
- Stormland (video game)
- Stormqueen!
- Stormtrooper (Star Wars)
- Stormwater
- Stormwater detention vault
- Story Musgrave
- Story of a Cloistered Nun
- Stowaway (upcoming film)
- Stowaway to Mars
- Stowaway to the Moon
- Stowaway to the Mushroom Planet
- Stoya
- Strabo (crater)
- Strafe (video game)
- Strahl (astronomy)
- Strahler number
- Strain 121
- Strain scanning
- Strait
- Strand Theatre (Manhattan)
- Strand Theatre (Marietta, Georgia)
- Strand plain
- Stranded (2001 film)
- Stranded (2013 film)
- Strange Bedfellows (Star Trek: Deep Space Nine)
- Strange Days at Blake Holsey High
- Strange matter
- Strange star
- Strangelet
- Strangeness and quark–gluon plasma
- Stranger in a Strange Land
- Strangers with Candy
- Strangways crater
- Strapped
- Strasbourg astronomical clock
- Strasenburgh Planetarium
- Strategic Defense Initiative
- Strategic Explorations of Exoplanets and Disks with Subaru
- Strategy of Technology
- Stratified slope deposit
- Stratigraphic section
- Stratigraphic unit
- Stratigraphy and Geological Correlation
- Stratolaunch Systems
- Stratonautical space suit
- Stratos Global Corporation
- Stratoscope
- Stratosphere
- Stratospheric Aerosol and Gas Experiment
- Stratospheric Observatory for Infrared Astronomy
- Stratospheric aerosol injection
- Stratospheric sulfur aerosols
- Stratotype
- Stratton (crater)
- Stratum Pier
- Strauss (crater)
- Stravinsky (crater)
- Straw
- Stream
- Stream capacity
- Stream capture
- Stream competency
- Stream gauge
- Stream gradient
- Stream order
- Stream pool
- Stream power
- Stream power law
- Stream restoration
- Streamflow
- Streaming instability
- Streblidae
- Street (crater)
- Street Girls
- Street Light (painting)
- Street light
- Street light interference phenomenon
- Street lighting in Stockholm
- Street lighting in the District of Columbia
- Streeter–Phelps equation
- Streets (film)
- Strehl ratio
- Strela (crane)
- Strela (rocket)
- Strela (satellite)
- Streptomyces lonarensis
- Streptomyces sp. myrophorea
- Stretched Rohini Satellite Series
- Stretcher
- Strewn field
- Striation (geology)
- Striene
- Strife (1996 video game)
- Strike Force (video game)
- Strike Suit Zero
- Strike Vector
- Strikers 1945
- Strikers 1945 III
- Strindberg (crater)
- String (physics)
- String Quartet No. 13 (Beethoven)
- String background
- String cosmology
- String duality
- String field theory
- String group
- String phenomenology
- String theory
- String theory landscape
- String topology
- Strip club
- Strip farming
- Strip-till
- Stripe 82
- Strippergate (Seattle)
- Strizh (space suit)
- Strobe beacon
- Strobe light
- Stroker & Hoop
- Strominger's equations
- Strong gravitational lensing
- Strong gravity
- Strongly interacting massive particle
- Structure formation
- Structure of Earth
- Strudel (ice)
- Struve (crater)
- Struve 1694
- Struve 2398
- Struve–Sahade effect
- Strypi
- Strömgren (crater)
- Strömgren integral
- Strömgren photometric system
- Strömgren sphere
- Stuart Appelle
- Stuart Baird
- Stuart Gordon
- Stuart Kingsley
- Stuart L. Shapiro
- Stuart Piggott
- Stuart Pottasch
- Stuart Roosa
- Stud welding
- StudSat
- StudSat-2
- Student Nitric Oxide Explorer
- Student Space Exploration & Technology Initiative
- Student Spaceflight Experiments Program
- Students for the Exploration and Development of Space
- Studia Quaternaria
- Studied Space Shuttle designs
- Studio Davout
- Study of Environmental Arctic Change
- Study of global communication
- Stuffed article
- Stumpff function
- Stura Vallis
- Sturecompagniet
- Stuttgart (soil)
- Stuttgart Observatory
- Stygiella
- Stygiolobus
- Stygofauna
- Styled Layer Descriptor
- Styx (moon)
- Stéphane Dumas (astrophysicist)
- Stéphane Udry
- Stöfler (crater)
- Störmer (crater)
- Su Hongjun
- Su Song
- Su-Shu Huang
- SuWt 2
- Suavjärvi crater
- Sub Club
- Sub-Earth
- Sub-Neptune
- Sub-Paleogene surface
- Sub-brown dwarf
- Sub-orbital spaceflight
- SubSpace (video game)
- Subaerial
- Subaqueous soil
- Subaru Telescope
- Subauroral ion drift
- Subbaetic System
- Subbasin
- Subbotin (crater)
- Subclub
- Subcontinental lithospheric mantle
- Subcrop (geology)
- Subduction
- Subdwarf
- Subdwarf B star
- Subdwarf O star
- Subgiant
- Subglacial channel
- Subglacial stream
- Subhash Saini
- Sublimation (phase transition)
- Sublunary sphere
- Submarine Voyage
- Submarine pipeline
- Submarine-launched satellite
- Submerge (nightclub)
- Submerged arc welding
- Submergent coastline
- Submersion (coastal management)
- Submillimeter Array
- Submillimeter Wave Astronomy Satellite
- Submillimetre Common-User Bolometer Array
- Submillimetre astronomy
- Subnautica
- Subnautica: Below Zero
- Suborbital spaceflight in 2008
- Suborbital spaceflight in 2009
- Subrahmanyan Chandrasekhar
- Subrata Roy (scientist)
- Subsatellite
- Subsidence
- Subsidence (atmosphere)
- Subsoil
- Subsolar point
- Substance of very high concern
- Substellar companion
- Substellar object
- Substorm
- Subsurface currents
- Subsurface dyke
- Subsurface flow
- Subsurface lithoautotrophic microbial ecosystem
- Subsurface utility engineering
- Subsynchronous orbit
- Subterranea (geography)
- Subterranean fauna
- Subterranean fiction
- Subterranean river
- Subterranean waterfall
- Subtropical Indian Ocean Dipole
- Subtropical pygmy owl
- Subtropics
- Suburban Wives
- Succedent house
- Succession (geology)
- Succubus
- Suchian (faunal age)
- Sucker Bait
- Sud Express
- Sudanian savanna
- Sudarsky's gas giant classification
- Sudbury Basin
- Sudbury Neutrino Observatory
- Sudden infant death syndrome
- Sudden ionospheric disturbance
- Sudhakara Dvivedi
- Sudines
- Sue Mason
- Sue Tyler Friedman Medal
- Suess (Martian crater)
- Suess (lunar crater)
- Suevite
- Suffa RT-70 radio telescope
- Sufficient similarity
- Suffosion
- Sufi Observing Competition
- Sugar Hill (1974 film)
- Sugarloaf Key Bat Tower
- Suhail (star)
- Suisei (spacecraft)
- Suisei Planitia
- Suishō no Dragon
- SuitSat
- Suite (geology)
- Suitport
- Suizhou meteorite
- Sujoy Roy
- Sukeban (film)
- Sukki Singapora
- Sukki, Nokki, Lekki and Tsukki
- Sukku Fault
- Sula scops owl
- Sulaco (fictional spacecraft)
- Sulagiri (meteorite)
- Sulawesi scops owl
- Sulci Gordii
- Sulcus (geology)
- Sulfate-reducing microorganism
- Sulfobacillus
- Sulfobacillus thermosulfidooxidans
- Sulfobacillus thermotolerans
- Sulfolobaceae
- Sulfolobales
- Sulfolobus acidocaldarius
- Sulfolobus metallicus
- Sulfolobus solfataricus
- Sulfolobus tokodaii
- Sulfonmethane
- Sulfophobococcus
- Sulfur cycle
- Sulfur lamp
- Sulfur monoxide
- Sulfur water
- Sulfurisphaera
- Sulis
- Sullam al-sama'
- Sullivan (Mercurian crater)
- Sulphur Mountain Cosmic Ray Station
- Sulpicius Gallus (crater)
- Sultan Iskandar Planetarium
- Sultan bin Salman Al Saud
- Sultana N. Nahar
- Sum frequency generation spectroscopy
- Sumati (astronomer)
- Sumba boobook
- SumbandilaSat
- Sumerian creation myth
- Sumidagawa Fireworks Festival
- Summa izbu
- Summanus
- Summer '68
- Summer School Teachers
- Summer Science Program
- Summer Triangle
- Summer Wars
- Summer Wear
- Summer solstice
- Summit
- Summit (supercomputer)
- Sumner (crater)
- Sump (cave)
- Sun
- Sun (heraldry)
- Sun Belt
- Sun Gun Telescope
- Sun Inn
- Sun Inn, Barnes
- Sun Jiadong
- Sun Probe
- Sun Ra
- Sun Temple (Sogamoso)
- Sun Temple of Userkaf
- Sun Temple, Modhera
- Sun and 13 Cantons
- Sun chart
- Sun cross
- Sun dog
- Sun glitter
- Sun god of Heaven
- Sun goddess of Arinna
- Sun goddess of the Earth
- Sun gun
- Sun of May
- Sun outage
- Sun path
- Sun protective clothing
- Sun sensor
- Sun sign astrology
- Sun tanning
- Sun temple
- Sun transit time
- Sun-Earth Day
- Sun-Ray Cinema
- Sun-synchronous orbit
- SunDog: Frozen Legacy
- SunSaluter
- SunShot Initiative
- SunSmart
- Sunagor
- Sunbreak
- Sunburn
- Sunburn (Muse song)
- Sunburst
- Suncup (snow)
- Sunda Trench
- Sunda scops owl
- Sundae Bloody Sundae (slogan)
- Sundaland
- Sundancer
- Sundial
- Sundial Bridge at Turtle Bay
- Sundial cannon
- Sundiver
- Sundiver (space mission)
- Sundman (crater)
- Sundowning
- Sune Toft
- Sunee Plaza
- Sungazing
- Sunglasses
- Sunglint
- Sungrazing comet
- Sunita Williams
- Sunjammer (spacecraft)
- Sunless Skies
- Sunlight
- Sunquest sundial
- Sunrise
- Sunrise (telescope)
- Sunrise Izumo
- Sunrise Seto
- Sunrise equation
- Sunset
- Sunset Limited
- Sunset Yellow FCF
- Sunset/Sunside
- Sunshield (JWST)
- Sunshine (2007 film)
- Sunshine Special
- Sunshine duration
- Sunspot
- Sunspot Solar Observatory
- Sunspot drawing
- Sunstone (medieval)
- Sunstorm (novel)
- Sunsás orogeny
- Sunward Aerospace Group
- Sunyaev–Zel'dovich Array
- Sunyaev–Zeldovich effect
- Suo (journal)
- Suomi NPP
- Suor Emanuelle
- Super Bomberman
- Super Bomberman 2
- Super Bomberman 3
- Super Bomberman 4
- Super Bomberman 5
- Super Bomberman R
- Super Bonk
- Super Chief
- Super Comet: After the Impact
- Super Continental
- Super Dimension Cavalry Southern Cross
- Super Fly (1972 film)
- Super Fly T.N.T.
- Super High Altitude Research Project
- Super Invader
- Super Kid
- Super Low Altitude Test Satellite
- Super Mario Bros. (film)
- Super Mario Bros. 2
- Super Mario Galaxy
- Super Mario Galaxy 2
- Super Mario Land 2: 6 Golden Coins
- Super Mario Odyssey
- Super Metroid
- Super Minkowski space
- Super Motherload
- Super QCD
- Super Robot Monkey Team Hyperforce Go!
- Super Star Wars
- Super Turrican (1992 video game)
- Super V-2
- Super Virasoro algebra
- Super heavy-lift launch vehicle
- Super soft X-ray source
- Super star cluster
- Super-AGB star
- Super-Earth
- Super-Jupiter
- Super-Kamiokande
- Super-LOTIS
- Super-Neptune
- Super-Neutron
- Super-Poincaré algebra
- Super-dense water
- Super-puff
- SuperCam
- Superantigen
- Superbird-A
- Superbird-A1
- Superbird-A2
- Superbird-B
- Superbird-B1
- Superbird-B2
- Superbird-B3
- Superbird-C
- Superbird-C2
- Superbubble
- Supercharge
- Superchick (film)
- Superclub
- Supercluster
- Superconducting camera
- Superconducting nanowire single-photon detector
- Superconducting tunnel junction
- Superconformal algebra
- Supercritical fluid
- Supercritical hydrolysis
- Superficial deposits
- Superflare
- Superfluid vacuum theory
- Superfly (2018 film)
- Supergalactic coordinate system
- Supergeometry
- Superghost
- Supergiant star
- Supergirl (1984 film)
- Supergirl (TV series)
- Supergranulation
- Supergravity
- Supergroup (physics)
- Superhabitable planet
- Superhero Movie
- Superhost
- Superhump
- Superimposition
- Superionic water
- Superior Beings
- Superjail!
- Superluminal motion
- Superluminous supernova
- Superman (1978 film)
- Superman IV: The Quest for Peace
- Superman vs. The Elite
- Superman/Batman: Public Enemies
- Superman: Birthright
- Superman: New Krypton
- Superman: World of New Krypton
- Supermanifold
- Supermassive Black Hole (song)
- Supermassive black hole
- Supermathematics
- Supermembranes
- Supermetric
- Supermoon
- Supermultiplet
- Supernova
- Supernova (2000 film)
- Supernova (2005 film)
- Supernova (TV series)
- Supernova Cosmology Project
- Supernova Legacy Survey
- Supernova impostor
- Supernova nucleosynthesis
- Supernova remnant
- Supernovae in fiction
- Superpartner
- Superpotential
- Supersonic Rocket Ship
- Superspace
- Supersplit supersymmetry
- Superstring (fireworks)
- Superstring theory
- Superstructure (condensed matter)
- Supersymmetric WKB approximation
- Supersymmetric gauge theory
- Supersymmetric localization
- Supersymmetric quantum mechanics
- Supersymmetric theory of stochastic dynamics
- Supersymmetry
- Supersymmetry algebra
- Supersymmetry algebras in 1 + 1 dimensions
- Supersymmetry breaking
- Supersymmetry breaking scale
- Supersymmetry nonrenormalization theorems
- Supersynchronous orbit
- Supertwink
- Supervolcano
- Superwind
- Supper club
- Supra-arcade downflows
- Suprachiasmatic nucleus
- Supralittoral zone
- Supremacy (song)
- Supreme Commander (video game)
- Supreme Palace enclosure
- SupremeSAT
- Sura Ionospheric Heating Facility
- Surat Shabd Yoga
- Sure-footedness
- Suresh Bhattarai
- Surf II
- Surf Party
- Surf break
- Surf zone
- Surface Detail
- Surface Dust Analyser
- Surface Water and Ocean Topography
- Surface brightness
- Surface brightness fluctuation
- Surface core level shift
- Surface differential reflectivity
- Surface energy transfer
- Surface exposure dating
- Surface features of Venus
- Surface gravity
- Surface irrigation
- Surface layer
- Surface nuclear magnetic resonance
- Surface plasmon resonance
- Surface runoff
- Surface rupture
- Surface water
- Surface-enhanced Raman spectroscopy
- Surface-extended X-ray absorption fine structure
- Surface-water hydrology
- Surface-wave-sustained discharge
- Surfcomber Hotel
- Surge (glacier)
- Surge channel
- Surrey Satellite Technology
- Surt (volcano)
- Surtur (moon)
- Survex
- Survey Review
- Survey of Bangladesh
- Survey of India
- Surveying and Spatial Sciences Institute
- Surveyor (crater)
- Surveyor 1
- Surveyor 2
- Surveyor 3
- Surveyor 4
- Surveyor 5
- Surveyor 6
- Surveyor 7
- Surveyor program
- Surveys in Geophysics
- Survival (Muse song)
- Survival of the Dead
- Survive or Die
- Surviving Mars
- Survivor's Quest
- Surya
- Surya Namaskar
- Surya Narayan Vyas
- Surya Siddhanta
- Surya Temple, Ranchi
- Suryanar Kovil
- Suryanarayana Temple, Arasavalli
- Suryanarayana Temple, Gollala Mamidada
- Susan Allison
- Susan B. Anthony dollar
- Susan Clancy
- Susan D. Shaw
- Susan Eichhorn Young
- Susan G. Finley
- Susan Helms
- Susan Kilrain
- Susan M. Gaines
- Susan McKenna-Lawlor
- Susan Niebur
- Susan Subak
- Susan Wijffels
- Susan Wood (literary scholar)
- Susana Agustí
- Susana Lizano
- Susannah Lazar
- Suspect (video game)
- Suspension plasma spray
- Sustainability and environmental management
- Sustainability science
- Sustainable architecture
- Sustainable drainage system
- Sustained Spheromak Physics Experiment
- Sustainer engine
- Sutherland Astronomical Society
- Sutherland spaceport
- Sutli bomb
- Sutter's Mill meteorite
- Sutton armillary
- Suttungr (moon)
- Suvasvesi
- Suvorexant
- Suzaku (satellite)
- Suzanne Aigrain
- Suzanne Imber
- Suzanne Smrekar
- Suzanne W. Tourtellotte
- Suzhi (crater)
- Suzhou Synta Optical Technology
- Suzy Solidor
- Sué
- Svadhishthana
- Svalbard Satellite Station
- Svanbergfjellet
- Svante Arrhenius
- Svarbhānu
- Svarog
- Svati
- Svea Fireworks
- Svedberg (crater)
- Svein Rosseland
- Sveinsdóttir (crater)
- Svengoolie
- Svenska Bio
- Sverdrup
- Sverdrup (crater)
- Sverdrup Gold Medal
- Sverre Aarseth
- Svetlana Gerasimenko
- Svetlana Savitskaya
- Svobodny Cosmodrome
- Swakopmund tracking station
- Swale (landform)
- Swami Sri Yukteswar Giri
- Swami Sundaranand
- Swami Vivekananda Planetarium
- Swamp
- Swamp Women
- Swamp Works
- Swampland (physics)
- Swan Coastal Plain
- Swan Inn
- Swan band
- Swan with Two Necks
- Swann (crater)
- Swapnatirtha
- Swarm (1998 video game)
- Swarm (spacecraft)
- Swarovski Optik
- Swasey (crater)
- Swash
- Swat-CUP
- Swathe
- Swazian
- Sweden Solar System
- Sweden: Heaven and Hell
- Swedish Astronomical Society
- Swedish Meteorological and Hydrological Institute
- Swedish National Space Agency
- Swedish Solar Telescope
- Swedish Space Corporation
- Swedish Vacuum Solar Telescope
- Swedish calendar
- Swedish-ESO Submillimetre Telescope
- Swedish–Russian Arc-of-Meridian Expedition
- Sweet Dreams (Are Made of This)
- Sweet Dreams (Beyoncé song)
- Sweet Dreams (TV series)
- Sweet Jesus, Preacherman
- Sweet Sugar (film)
- Sweet Sweetback's Baadasssss Song
- Swell (geology)
- Swetharanyeswarar Temple
- Swift (Deimian crater)
- Swift (crater)
- Swift (lunar crater)
- Swift Engineering
- Swift J1745-26
- Swimming pool
- Swingin' on the Moon
- Swiss 1.2-metre Leonhard Euler Telescope
- Swiss Journal of Palaeontology
- Swiss Propulsion Laboratory
- Swiss Seismological Service
- Swiss Space Office
- Swiss Space Systems
- Swiss cheese features
- SwissCube-1
- Swisstopo
- Switchblade Honey
- Switzerland
- Sword of Chaos
- Sword of the Stars
- Swords of Mars
- Swvl
- Sybil Christopher
- Sybil P. Seitzinger
- Sycamore Canyon Test Facility
- Sycorax (moon)
- Syd Mead
- Sydney Chapman (mathematician)
- Sydney Kirkby (explorer)
- Sydney University Stellar Interferometer
- Sydney/Melbourne Express
- Sydyk
- Syed Iqbal Hasnain
- Sygic
- Sykia (Voula)
- Sylacauga (meteorite)
- Sylph
- Sylvain Arend
- Sylvester (crater)
- Sylvia Acevedo
- Symbiobacterium thermophilum
- Symbiotic binary
- Symbiotic nova
- Symbolic stars
- Symons Gold Medal
- Symphonie
- Symphony No. 5 (Beethoven)
- Symptoms (film)
- Synapse Films
- Synchronous Meteorological Satellite
- Synchronous frame
- Synchronous orbit
- Synchrotron Radiation Source
- Syncline
- Syncom
- Syndicate (The X-Files)
- Syneclise
- Synemporion
- Synergy Moon
- Synesius
- Synestia
- Syngas fermentation
- Synge's world function
- Syngenetic permafrost growth
- Synopses of the British Fauna
- Synoptic Optical Long-term Investigations of the Sun
- Synoptical astrology
- Synta Technology Corporation of Taiwan
- Synthetic aperture sonar
- Synthetic ecosystems
- Synthetic vision system
- Synthetic-aperture radar
- Synthetically thinned aperture radar
- Syntrophaceticus schinkii
- Syracuse (satellite)
- Syrian Space Agency
- Syrt
- Syrtis Major Planum
- Syrtis Major quadrangle
- System (stratigraphy)
- System Shock 2
- System requirements (spacecraft system)
- System-specific impulse
- Systematic and Evolutionary Biogeography Association
- Systemic (amateur extrasolar planet search project)
- Systems Tool Kit
- Systems ecology
- Systems for Nuclear Auxiliary Power
- Systems geology
- Syzygy (astronomy)
- Szilard (crater)
- Szymon Suckewer
- São Gião Radio Telescope
- Sääksjärvi
- Sébastien Charnoz
- Sénarmont prism
- Sól (Norse mythology)
- Söderfjärden
- Sömmering (crater)
- Sārāvalī
- Sōtatsu (crater)
- T Andromedae
- T Antliae
- T Aurigae
- T Boötis
- T Carinae
- T Centauri
- T Cephei
- T Ceti
- T Coronae Australis
- T Coronae Borealis
- T Crucis
- T Cygni
- T Leporis
- T Microscopii
- T Normae
- T Persei
- T Pyxidis
- T Scorpii
- T Tauri
- T Tauri star
- T Tauri wind
- T Ursae Minoris
- T Vulpeculae
- T-7 (rocket)
- T-DJ Milana
- T-Stoff
- T-duality
- T-type asteroid
- T. A. Heppenheimer
- T. E. Dikty
- T. F. Tickner
- T. H. E. C. Espin
- T. Jack Lee
- T. Mayer (crater)
- T. Neil Davis
- T. O'Conor Sloane
- T. S. van Albada
- T.: The Terrestrial
- T.E.D.D.
- T.I.
- T/Space
- T10 (satellite)
- T11 (satellite)
- T12 (satellite)
- T14 (satellite)
- T2K experiment
- T5 (satellite)
- TA Luft
- TACK
- TACOMSAT
- TAE Technologies
- TAGSAM
- TAI Anka
- TALC+
- TAMA 300
- TAP Maintenance & Engineering
- TARANIS
- TARDIS
- TAROT-South robotic observatory
- TASC, Inc.
- TAT Technologies
- TAU (spacecraft)
- TAUVEX
- TCM Underground
- TD-1A
- TD1 Catalog of Stellar Ultraviolet Fluxes
- TDR moisture sensor
- TDRS-1
- TDRS-10
- TDRS-11
- TDRS-12
- TDRS-13
- TDRS-3
- TDRS-4
- TDRS-5
- TDRS-6
- TDRS-7
- TDRS-8
- TDRS-9
- TDRS-B
- TE-416 Tomahawk
- TEM (nuclear propulsion)
- TEPREL
- TET-1
- TEXUS
- TGK PG
- THEMIS
- THEO
- THEOS (satellite)
- THESEUS (satellite)
- TIMED
- TIP TIG
- TIRA (System)
- TIROS-1
- TIROS-10
- TIROS-2
- TIROS-3
- TIROS-4
- TIROS-5
- TIROS-6
- TIROS-7
- TIROS-8
- TIROS-9
- TIROS-M
- TIROS-N
- TITAN2D
- TJ-II
- TKK Fried Chicken
- TKS (spacecraft)
- TMK
- TMRO
- TN J0924-2201
- TNP-ATP
- TNT Jackson
- TNTlite
- TNTmips
- TOI 1338
- TOI 677 b
- TOI 700
- TOI 700 d
- TOI 732
- TOMCAT/SLIMCAT
- TON 618
- TONGASAT
- TOPAZ nuclear reactor
- TOPEX/Poseidon
- TORRO
- TORU
- TOXMAP
- TP-82 Cosmonaut survival pistol
- TRACE
- TRACE (computer program)
- TRACER (cosmic ray detector)
- TRAPPIST
- TRAPPIST-1
- TRAPPIST-1b
- TRAPPIST-1c
- TRAPPIST-1d
- TRAPPIST-1e
- TRAPPIST-1f
- TRAPPIST-1g
- TRAPPIST-1h
- TRICOM-1R
- TROPI
- TRW Inc.
- TSUBAME (satellite)
- TSX-5
- TT Aquilae
- TT Corvi
- TT Cygni
- TU Andromedae
- TU Corvi
- TU Mensae
- TU Muscae
- TUGSAT-1
- TV Century 21
- TV Corvi
- TV Geminorum
- TV Pictoris
- TV Roskosmos
- TV-SAT 1
- TVLM 513-46546
- TW Andromedae
- TW Horologii
- TW Hydrae
- TW Hydrae association
- TW Hydrae b
- TW Pictoris
- TW Piscis Austrini
- TWINS
- TX Camelopardalis
- TX Piscium
- TXS 0506+056
- TY Coronae Australis
- TY Coronae Borealis
- TY Pyxidis
- TYC 8998-760-1
- TYC 9486-927-1
- TZ Cassiopeiae
- Ta'lab
- Tabby's Star
- Tabitha Fringe Chase
- Table (landform)
- Table Mountain Observatory
- Table football
- Table of Opposites
- Table of stars with Bayer designations
- Table of stars with Flamsteed designations
- TabletSat-Aurora
- TacSat-1
- TacSat-2
- TacSat-3
- TacSat-4
- TacSat-5
- Tacchini (crater)
- Tachocline
- Tachometer
- Tachyon
- Tachyon condensation
- Tachyon: The Fringe
- Tachyonic field
- Tacitus (crater)
- Tacoma (video game)
- Tacquet (crater)
- Tactical Satellite Program
- Tactical air navigation system
- Tactical reconnaissance and counter-concealment-enabled radar
- Tactile graphic
- Tad Murty
- Tader Valles
- Tadeusz Banachiewicz
- Tadeáš Hájek
- Tadpole Galaxy
- Taedongmoon Cinema
- Taeduk Radio Astronomy Observatory
- Taenite
- Taepodong-2
- Taft E. Armandroff
- Tag and Bink
- Tagish Lake (meteorite)
- Tai Sui
- Tai Wei (crater)
- Taiga
- Taiji Program in Space
- Taika Waititi
- Taiki Aerospace Research Field
- Taikodom
- Tail (Chinese constellation)
- Tainan Astronomical Education Area
- Tainan Flower Night Market
- Tainter gate
- Taipei Astronomical Museum
- Taitao ophiolite
- Taiwanese–American Occultation Survey
- Taiyo Sentai Sun Vulcan
- Taiyuan Satellite Launch Center
- Tajika Jyotish
- Tajika Neelakanthi
- Tajikistan
- Tak 2: The Staff of Dreams
- Takaaki Kajita
- Takafumi Horie
- Takahashi Seisakusho
- Takao Doi
- Takao Kobayashi
- Takatāpui
- Takayoshi (crater)
- Takayuki Tatsumi
- Take It Back
- Take Off Your Clothes, Doll
- Take On Mars
- Take Us to Your Chief: and Other Stories
- Take me to your leader (phrase)
- Take-off warning system
- Takehiko Itō
- Taken (miniseries)
- Takeoff Acceleration Monitoring System
- Takeshi Nagata
- Takeshi Urata
- Taklamakan Desert
- Takumi Shibano
- Takuo Kojima
- Talbot (crater)
- Talbot effect
- Talbutal
- Talcott Mountain Science Center
- Talemzane crater
- Tales from Jabba's Palace
- Tales from the Borderlands
- Tales from the Empire
- Tales from the Mos Eisley Cantina
- Tales from the New Republic
- Tales from the QuadeaD Zone
- Tales of Arcadia
- Tales of Halloween
- Tales of the Bounty Hunters
- Tales of the Jedi
- Talgua caves
- Taliabu masked owl
- Talik
- Talk with Toey
- Talking About Life
- Talking in Your Sleep (Crystal Gayle song)
- Talking in Your Sleep (The Romantics song)
- Tall Betsy
- Tall Tale (film)
- Tall Timbers Research Station and Land Conservancy
- Tallahassee meridian
- Tallinn Observatory
- Tallulah (DJ)
- Talos
- Talvin Singh
- Tama-nui-te-rā
- Tamanrasset River
- Tamara Davis
- Tamara E. Jernigan
- Tamara Smirnova
- Tamarack R. Czarnik
- Tamdakht meteorite
- Tamil calendar
- Taming of the Fire
- Tamke-Allan Observatory
- Tamm (crater)
- Tampa Theatre
- Tamu Massif
- Tan line
- TanDEM-X
- TanSat
- Tanabe–Sugano diagram
- Tanaica Montes
- Tanana (soil)
- Tancredo-1
- Tandem Mirror Experiment
- Tandem Reconnection and Cusp Electrodynamics Reconnaissance Satellites
- Tanegashima Space Center
- Tangerang fireworks disaster
- Tangerinn
- Tania Aebi
- Tanimbar boobook
- Taniquetil Montes
- Tanit
- Tanjung Piai
- Tank Girl (film)
- Tank on the Moon
- Tannerus (crater)
- Tanning activator
- Tanning dependence
- Tanning lamp
- Tanpopo (mission)
- Tantalus Fossae
- Tantrasamgraha
- Tanya (1976 film)
- Tanya Harrison (scientist)
- Tao Hongjing
- Taoism
- Tap water
- Tapchan
- Tapestry (Star Trek: The Next Generation)
- Tappan Wright King
- Tar pit
- Tara Murphy
- Tara Ruttley
- Tara Wali Kothi
- Taral Wayne
- Taranis
- Tarantism
- Tarantula Nebula
- Tarawa Climate Change Conference
- Tardebigge Engine House
- Tardigrade
- Target Earth (film)
- Target Luna
- Target acquisition minefield detection system
- Target strength
- Tarmo Oja
- Tarpeia (crater)
- Tarqeq
- Tarqiup Inua
- Tarr Chronicles
- Tarragona International Fireworks Displays Competition
- Tarsus (crater)
- Tartarus Colles
- Tartu Observatory
- Taruntius (crater)
- Tarvos (moon)
- Tas (series)
- Tasco
- Tashiro's indicator
- Tashkent Planetarium
- Tashlikh
- Tasimeter
- TaskForceMajella
- Tasseled cap transformation
- Tateos Agekian
- Tatjana Barbakoff
- Tatooine
- Tatooine Ghost
- Tatsuya Oe
- Tattva
- Tattva (Jainism)
- Tatyana Kuznetsova
- Tau Andromedae
- Tau Aquarii
- Tau Aquilae
- Tau Arietis
- Tau Aurigae
- Tau Boötis
- Tau Boötis b
- Tau Cancri
- Tau Canis Majoris
- Tau Capricorni
- Tau Cassiopeiae
- Tau Centauri
- Tau Ceti
- Tau Ceti (video game)
- Tau Ceti e
- Tau Ceti f
- Tau Ceti in fiction
- Tau Coronae Borealis
- Tau Cygni
- Tau Draconis
- Tau Eridani
- Tau Geminorum
- Tau Gruis
- Tau Herculids
- Tau Herculis
- Tau Hydrae
- Tau Leonis
- Tau Librae
- Tau Lupi
- Tau Ophiuchi
- Tau Orionis
- Tau Pegasi
- Tau Persei
- Tau Piscis Austrini
- Tau Piscium
- Tau Puppis
- Tau Sagittarii
- Tau Scorpii
- Tau Sculptoris
- Tau Serpentis
- Tau Tauri
- Tau Ursae Majoris
- Tau Virginis
- Tau Zero
- Tau1 Aquarii
- Tau1 Arietis
- Tau1 Capricorni
- Tau1 Eridani
- Tau1 Gruis
- Tau1 Gruis b
- Tau1 Hydrae
- Tau1 Lupi
- Tau1 Serpentis
- Tau2 Aquarii
- Tau2 Arietis
- Tau2 Capricorni
- Tau2 Eridani
- Tau2 Gruis
- Tau2 Hydrae
- Tau2 Lupi
- Tau2 Serpentis
- Tau3 Eridani
- Tau3 Gruis
- Tau3 Serpentis
- Tau4 Eridani
- Tau4 Serpentis
- Tau5 Eridani
- Tau5 Serpentis
- Tau6 Eridani
- Tau6 Serpentis
- Tau7 Eridani
- Tau7 Serpentis
- Tau8 Eridani
- Tau8 Serpentis
- Tau9 Eridani
- Taub–NUT space
- Tauchmann telescope
- Taufik Akbar
- Taur (video game)
- Taurids
- Taurus (astrology)
- Taurus (constellation)
- Taurus Molecular Cloud
- Taurus Mountains
- Taurus Nike Tomahawk
- Taurus Orion
- Taurus Poniatovii
- Taurus Tomahawk
- Taurus in Chinese astronomy
- Taurus–Littrow
- Tavis Smiley
- Tawhaki Patera
- Tawny-bellied screech owl
- Tawny-browed owl
- Taxon cycle
- Taygete (moon)
- Taylor (crater)
- Taylor James
- Taylor Wang
- Taylor state
- Taylor–Couette flow
- Taylor–Goldstein equation
- Taytay (crater)
- Taz in Escape from Mars
- Tbeli Abuserisdze
- Tbilisi Aircraft Manufacturing
- Te-Tzu Chang
- Te-uri
- TeLEOS-1
- Teacher in Space Project
- Teacup galaxy
- Team AngelicvM
- Team FREDNET
- Team Miles
- Team composition and cohesion in spaceflight missions
- TeamIndus
- TeamTNT
- Teapot Committee
- Teays River
- Tebbutt (crater)
- TecSAR
- TechEdSat
- TechSat-21
- Techlog
- Technetium star
- Technical Standard Order
- Technicolor (physics)
- Technique for Soil Evaluation and Categorisation for Natural and Anthropogenic Soils
- Technoboy
- Technologies in 2001: A Space Odyssey
- Technology Experiment Satellite
- Technology for Autonomous Operational Survivability
- Technology–organization–environment framework
- Technosignature
- Technosol
- Tecterra
- Tectonic evolution of Patagonia
- Tectonic uplift
- Tectonics (journal)
- Tectonics of Mars
- Tectonophysics (journal)
- Tecwyn Roberts
- Ted Ellis (artist)
- Ted Mann
- Ted Owens (contactee)
- Ted White (author)
- Teddy Harvia
- Teddy Stauffer
- Tee Scott
- Teebone
- Teegarden's Star
- Teegarden's Star b
- Teegarden's Star c
- Teela
- Teen Age Message
- Teen Dance Ordinance
- Teen Ta Tseang Keun
- Teen Titans (TV series)
- Teen Titans Go! To the Movies
- Teen-a Witch
- Teenage Dirtbag (film)
- Teenage Hitchhikers
- Teenage Mother
- Teenage Mutant Ninja Turtles (1987 TV series, season 10)
- Teenage Mutant Ninja Turtles (1987 TV series, season 3)
- Teenage Mutant Ninja Turtles (1987 TV series, season 4)
- Teenage Mutant Ninja Turtles (1987 TV series, season 5)
- Teenage Mutant Ninja Turtles (1987 TV series, season 6)
- Teenage Mutant Ninja Turtles (1987 TV series, season 8)
- Teenage Mutant Ninja Turtles (2003 TV series, season 3)
- Teenage Mutant Ninja Turtles (2003 TV series, season 4)
- Teenage Mutant Ninja Turtles (2003 TV series, season 6)
- Teenage Mutant Ninja Turtles (2012 TV series)
- Teenage Mutant Ninja Turtles (2012 TV series, season 1)
- Teenage Mutant Ninja Turtles (2012 TV series, season 2)
- Teenage Mutant Ninja Turtles (2012 TV series, season 3)
- Teenage Mutant Ninja Turtles (2012 TV series, season 4)
- Teenage Mutant Ninja Turtles (2012 TV series, season 5)
- Teenage Mutant Ninja Turtles Adventures
- Teenage Seductress
- Teenagers from Mars
- Teenagers from Outer Space
- Teens in the Universe
- Tegnue
- Tegridy Farms Halloween Special
- Teide 1
- Teide Observatory
- TeikyoSat-3
- Teilzone
- Teisserenc (crater)
- Teisserenc de Bort (crater)
- Teissier affair
- Tejas sequence
- Tekken 5
- Tekken 5: Dark Resurrection
- Tektite
- Tektite habitat
- Telauges
- Tele-X
- TeleType Co.
- Telecompressor
- Teleconnection
- Teledesic
- Telematics
- Telemetry
- Telenoid R1
- Teleological argument
- Teleoperation
- Teleoperator Retrieval System
- Teleparallelism
- Teleportation in fiction
- Telepresence
- Telepresence technology
- Telerobotics
- Telesat
- Telescope
- Telescope Array Project
- Telescope for Habitable Exoplanets and Interstellar/Intergalactic Astronomy
- Telescope mount
- Telescopio Carlos Sánchez
- Telescopium
- Telescopium Herschelii
- Telescopium in Chinese astronomy
- Telespazio
- Telespazio VEGA UK
- Telesto (moon)
- Teletoon at Night
- Television Infrared Observation Satellite
- Televue
- Telit
- Telkom-2
- Telkom-3
- Telkom-3S
- Telkom-4
- Tell-tale (spacecraft)
- TellStar
- Telluric contamination
- Tellurion
- Tellus A
- Tellus B
- Telmatology
- Telogis
- Telstar
- Telstar (instrumental)
- Telstar 1
- Telstar 11
- Telstar 11N
- Telstar 12
- Telstar 12V
- Telstar 14
- Telstar 14R
- Telstar 18
- Telstar 18V
- Telstar 19V
- Telstar 2
- Telstar 301
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- Telstar 303
- Telstar 4
- Telstar 401
- Telstar 402
- Telstar 9
- Teltron tube
- Telus World of Science (Edmonton)
- Temisas Astronomical Observatory
- Temistocle Zona
- Tempe Fossae
- Tempel (crater)
- Tempel 1
- Temperance Billiard Hall, Fulham
- Temperate broadleaf and mixed forests
- Temperate coniferous forest
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- Temperate grasslands, savannas, and shrublands
- Temperature and Winds for InSight
- Temple Grandin
- Temple of Diana (Nemi)
- Temple of Luna
- Temple of the Cat
- Temple of the Moon (China)
- Temple of the Moon (Peru)
- Temple of the Sun (Rome)
- Tempo (astronomy)
- Tempo3
- Temporary satellite
- Tempsat-1
- Ten Acre Observatory
- Ten Bruggencate (crater)
- Tenacity (mineralogy)
- Tenaja
- Tenctonese
- Tender Loving Care (film)
- Tender Touches
- Tendex line
- Tenement (film)
- Tenerife Experiment
- Tenerife meridian
- Tenham (meteorite)
- Tenma
- Tennessean (train)
- Tennessee Aquarium
- Tennessee Theatre
- Tennessee Theatre (Nashville)
- Tenoumer crater
- Tenrikyo creation narrative
- Tensiometer (soil science)
- Tension (geology)
- Tensnake
- Tensor–vector–scalar gravity
- Tenth Cambridge survey
- Tenzin (The Legend of Korra)
- Tenzing Montes
- Teotihuacan
- Tepetate
- Tephriphonolite
- Tephrite
- Tephrochronology
- Tepidanaerobacter
- Tepidanaerobacter acetatoxydans
- Tepidanaerobacter syntrophicus
- Ter-Antonyan function
- Tera-hertz Explorer
- Terahertz spectroscopy and technology
- Terahertz time-domain spectroscopy
- Terasca
- Terby (crater)
- Terence Dickinson
- Terence James Elkins
- Terence T. Henricks
- Teresa Anderson
- Teresa Lago
- Teresa Nielsen Hayden
- Tereshkova (crater)
- Teri (geology)
- Teri Sue Wood
- Termantia
- Terminal Frost
- Terminal Island (film)
- Terminal USA
- Terminal Velocity (video game)
- Terminal countdown demonstration test
- Terminal velocity
- Termination (geomorphology)
- Terminator (solar)
- Terminus (2000 video game)
- Termites from Mars
- Ternovka crater
- TerrSet
- Terra (character)
- Terra (satellite)
- Terra Australis
- Terra Formars
- Terra Formars (film)
- Terra Nivium
- Terra Nova (journal)
- Terra Nova: Strike Force Centauri
- Terra Obscura
- Terra Prime
- Terra fusca
- Terra incognita
- Terra nullius
- Terra pericolosa
- Terra preta
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- Terra-3
- TerraSAR-X
- Terrace (geology)
- Terrace Crossing
- Terrace Theatre (Minnesota)
- Terracette
- Terrae Incognitae
- Terraforming
- Terraforming in literature and popular culture
- Terraforming of Mars
- Terraforming of Venus
- Terrahawks
- Terrain
- Terrain awareness and warning system
- Terrain cartography
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- Terramechanics
- Terran Trade Authority
- Terranigma
- Terrarium (space habitat)
- Terraserver.com
- TerreStar Corporation
- TerreStar-1
- Terrence Parker
- Terrence W. Wilcutt
- Terreneuvian
- Terrestrial Planet Finder
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- Terrestrial planet
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- Terrier Malemute
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- Terrigenous sediment
- Territorial waters
- Terror (Bottom)
- Terror by Satellite
- TerrorVision
- Terrorform
- Terry Carr
- Terry Francis
- Terry Gilliam
- Terry Hart
- Terry Kucera
- Terry Lovejoy
- Terry Plank
- Terry Pratchett's Going Postal
- Terry Pratchett's Hogfather
- Terry Pratchett's The Colour of Magic
- Terry W. Virts
- Terry Wilson (scientist)
- Tersicoccus phoenicis
- Tert-Butyl alcohol
- Terzaghi's principle
- Terzan 1
- Terzan 5
- Terzan 7
- Tesla (crater)
- Tesla coil
- Tessar
- Tessera (Venus)
- Test Methods Regulation
- Test Tube Aliens
- Test Tube Babies (film)
- Test article (aerospace)
- Test particle
- Test target
- Testia
- Tests of general relativity
- Tethered formation flying
- Tethys (moon)
- Tetrabamate
- Tetrabarbital
- Tetrabiblos
- Tetractys
- Tetrad (astronomy)
- Tetradic Palatini action
- Tetrafluorohydrazine
- Tetrahydrodeoxycorticosterone
- Tetrataenite
- Tetronal
- Tetsuo Kagawa
- Tetsuya Fujii
- Tevatron
- Tevian Dray
- Texas A&M Astronomical Observatory
- Texas Chief
- Texas Eagle
- Texas Eagle (MP train)
- Texas Special
- Texas Star Party
- Texas Supernova Search
- Texas Theatre
- Texas Zephyr
- Texas fireball
- Texture (cosmology)
- Teylers Fossil Room II
- Tezcatlipoca
- Thai National Observatory
- Thai National Radio Telescope
- Thai names in space
- Thai solar calendar
- Thaicom
- Thaicom 4
- Thaicom 5
- Thaicom 6
- Thaicom 8
- Thais Russomano
- Thaisa Storchi Bergmann
- Thaksin Express
- Thalassa (moon)
- Thalassogen
- Thalassophobia
- Thales (crater)
- Thales Alenia Space
- Thalweg
- Thanatophage
- Thanks for the Memory (Red Dwarf)
- Tharp (crater)
- Tharsis
- Tharsis (video game)
- Tharsis Montes
- Tharsis Tholus
- Tharsis quadrangle
- That Man Bolt
- That Time I Got Reincarnated as a Slime
- That's the Way of the World (film)
- Thatchfield Great Cave
- Thaumarchaeota
- Thaumasia Plateau
- Thaumasia quadrangle
- Thaw depth
- The 10th Kingdom
- The 12 Disasters of Christmas
- The 2nd Law: Unsustainable
- The 4 Percent Universe
- The 5,000 Fingers of Dr. T.
- The 50 Most Extreme Places in Our Solar System
- The 5th Wave (film)
- The 7D
- The Addams Family Theme
- The Adventure
- The Adventures of Baron Munchausen
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- The Adventures of Ichabod and Mr. Toad
- The Adventures of Jimmy Neutron, Boy Genius
- The Adventures of Luther Arkwright
- The Adventures of Mark Twain (1985 film)
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- The Adventures of Rad Gravity
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- The Adventures of Star Saver
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- The Afflicted (film)
- The Alchemist (novel)
- The Alexandra, New Barnet
- The Algebraist
- The Alien (novel)
- The Alien Encounters
- The All-Night Show
- The Alton Gift
- The Alvin Weinberg Foundation
- The Amateur Astronomer
- The Amazing 3
- The Amazing Maurice and His Educated Rodents
- The Amazing Transplant
- The Ambassadors of Death
- The Ambergris Element
- The American Astronaut
- The American Scream
- The Andalite Chronicles
- The Android Invasion
- The Andromeda Breakthrough
- The Andromeda Nebula
- The Andromeda Strain (film)
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- The Angel, Hayes
- The Angry Red Planet
- The Animal-Cracker Plot
- The Annotated Alice
- The Antelope, Birmingham
- The Apocalypse (2007 film)
- The Approaching Storm
- The Arch (nightclub)
- The Arches (Glasgow)
- The Architects of History
- The Arena (1974 film)
- The Ark in Space
- The Armageddon Inheritance
- The Arrival (1996 film)
- The Arrival (novel)
- The Art of Avatar
- The Art of Discworld
- The Art of Dreaming
- The Ask and the Answer
- The Assayer
- The Astro-Zombies
- The Astrology of Personality
- The Astronaut
- The Astronaut Monument
- The Astronaut Wives Club
- The Astronaut's Wife
- The Astronauts
- The Astronomer's Dream
- The Astronomer's Telegram
- The Astronomical Journal
- The Astronomy and Astrophysics Review
- The Astrophysical Journal
- The Atlas of Pern
- The Attack (novel)
- The Avengers (2012 film)
- The BFG
- The BFG (2016 film)
- The Baby Blue Movie
- The Bad Bunch
- The Ballad of Beta-2
- The Barbarians (1987 film)
- The Barge Inn
- The Barley Mow, Clifton Hampden
- The Barley Mow, Marylebone
- The Barry Gibb Talk Show
- The Baum, Rochdale
- The Bazaar of Bad Dreams
- The Bear That Couldn't Sleep
- The Beast Master
- The Beatniks (film)
- The Bedford, Balham
- The Beehive, Marylebone
- The Beehive, Welwyn Garden City
- The Beerhouse
- The Beginning (Red Dwarf)
- The Beginning (novel)
- The Beguiling of Merlin
- The Being
- The Beistle Company
- The Bell Inn, Aldworth
- The Bell, City of London
- The Berkeley, Scunthorpe
- The Best Halloween Ever
- The Best of Both Worlds (Star Trek: The Next Generation)
- The Big Bird Cage
- The Big Bounce (1960 film)
- The Big Bust Out
- The Big Cube
- The Big Doll House
- The Big Empty (The Expanse)
- The Big Jump
- The Big Picture (book)
- The Big Pull
- The Big Splash (book)
- The Biggin Hall
- The Billion Dollar Boy
- The Bird of Time
- The Birdbot of Ice-Catraz
- The Birth and Death of the Sun
- The Birth of Merlin
- The Black Cloud
- The Black Company (novel)
- The Black Corridor
- The Black Fleet Crisis
- The Black Friar (pub)
- The Black Gestapo
- The Black Godfather
- The Black Hole (1979 film)
- The Black Hole (2006 film)
- The Black Hole (video game)
- The Black Planet
- The Black Six
- The Bleeding (film)
- The Bleeding Wolf, Scholar Green
- The Blind Beggar
- The Blob
- The Blob (Pacific Ocean)
- The Bloody Sun
- The Blue Anchor, St Albans
- The Blue Angel (New York nightclub)
- The Blue Aura
- The Blue Barbarians
- The Blue Bell, Barton-upon-Humber
- The Blue Bowl
- The Blue Flame (play)
- The Blue Marble
- The Blue World
- The Bobbin, Clapham
- The Bones of Zora
- The Book of Giants
- The Book of Merlyn
- The Book of Vision
- The Book of the Long Sun
- The Book of the New Sun
- The Book of the Short Sun
- The Boondocks (2005 TV series)
- The Boot, St Albans
- The Borderland of Sol
- The Born Losers
- The Boss (Metal Gear)
- The Boston Teens
- The Box (2009 film)
- The Boy Merlin
- The Boy Who Climbed Into the Moon
- The Brain That Wouldn't Die
- The Brain of Colonel Barham
- The Brains of Earth
- The Brak Show
- The Brave Little Toaster Goes to Mars
- The Breach (Star Trek: Enterprise)
- The Brick Moon
- The Bridge (novel)
- The Bull, St Paul's Cray
- The Bulldog Breed
- The Buried Moon
- The Burning (film)
- The Butchers (2014 film)
- The Butterfly Club
- The Butterjunk Effect
- The CBS Late Movie
- The Cage (Star Trek: The Original Series)
- The Call to Vengeance
- The Canadian Geographer
- The Candy Snatchers
- The Candy Tangerine Man
- The Cape (1996 TV series)
- The Captive Temple
- The Cartographic Journal
- The Case for Mars
- The Case of the Missing Moon Rocks
- The Castle, Farringdon
- The Castle, Harrow
- The Castle, Macclesfield
- The Cat & Fiddle
- The Cat Sat Asleep by the Side of the Fire
- The Cat from Outer Space
- The Causal Angel
- The Caves of Drach
- The Centauri Device
- The Centre Page
- The Centurion, Bath
- The Cestus Deception
- The Chainsmokers
- The Challenger Disaster
- The Champion of the Thames
- The Changing Face of Evil
- The Charlotte
- The Chase of the Golden Meteor
- The Cheerleaders
- The Chemical Brothers
- The Chequers, Little Gransden
- The Chequers, Potters Bar
- The Cheshire Cheese
- The Children's Museum, Connecticut
- The Choppers
- The Chronicles of Pern: First Fall
- The Chronicles of Riddick
- The Chronicles of Riddick: Assault on Dark Athena
- The Chronicles of Riddick: Escape from Butcher Bay
- The Chronicles of Thomas Covenant
- The Churchill Arms
- The Citizens Band
- The City Dark
- The City Outside the World
- The City and the Stars
- The City of the Saved
- The City of the Sun
- The City on the Edge of Forever
- The Clachan
- The Clean Room
- The Clear Horizon
- The Cloud of Unknowing
- The Cock, Broom
- The Cock, Fulham
- The Cock, St Albans
- The Cockpit, London
- The Collapsing Empire
- The Collapsium
- The Colony of Lies
- The Colorful Character
- The Colour Out of Space
- The Colour of Magic
- The Colour of Magic (video game)
- The Comet (short story)
- The Coming of the King
- The Company of Wolves
- The Complete Book of Outer Space
- The Concrete Jungle (film)
- The Conquest of Interplanetary Spaces
- The Conquest of Space
- The Conquest of Space (Lasser book)
- The Consolation of Philosophy
- The Consolidator
- The Consuming Fire
- The Continent Makers
- The Conversation of Eiros and Charmion
- The Cool Ghoul
- The Cool Ghoul (Cleveland)
- The Cool World (film)
- The Copernican Question
- The Copernican Revolution (book)
- The Coronation Tap
- The Cosmic Connection
- The Cosmonaut
- The Counter-Clock Incident
- The Courtship of Princess Leia
- The Creator (diamond)
- The Creature Wasn't Nice
- The Creeping Terror
- The Crime and the Glory of Commander Suzdal
- The Cross Keys, Chelsea
- The Cross Keys, Hammersmith
- The Cross Keys, Totternhoe
- The Crossing (Star Trek: Enterprise)
- The Crow (1994 film)
- The Crown Inn, Birmingham
- The Crown Inn, Glossop
- The Crown and Horseshoes
- The Crown, Bristol
- The Crown, Covent Garden
- The Crown, Cowley
- The Crown, Houghton Regis
- The Crown, Islington
- The Crown, Twickenham
- The Crucible of Time
- The Crumpled Horn
- The Cryosphere
- The Crystal Cave
- The Crystal Crypt
- The Crystal Gazebo
- The Crystal Lake
- The Crystal Method
- The Crystal Star
- The Culture
- The Currents of Space
- The Curse of Peladon
- The Cutting Room
- The Cycle (video game)
- The Cycle Savages
- The D'oh-cial Network
- The Dalek Generation
- The Dalek Invasion of Earth
- The Dangerous Rescue
- The Dark Beyond the Stars
- The Dark Crystal
- The Dark Crystal (video game)
- The Dark Crystal: Age of Resistance
- The Dark Nest trilogy
- The Dark Path (McIntee novel)
- The Dark Side of Tomorrow
- The Dark Side of the Moon (1990 film)
- The Dark Side of the Sun
- The Dark Tower (album)
- The Dark Triangle
- The Darkangel Trilogy
- The David Letterman Show
- The David S. Pumpkins Halloween Special
- The Day After Tomorrow (TV special)
- The Day Before the Revolution
- The Day Mars Invaded Earth
- The Day of Reckoning (novel)
- The Day of the Doctor
- The Day the Earth Smiled
- The Day the Earth Stood Still
- The Day the Earth Stood Still (2008 film)
- The Daydreamer (film)
- The Daylight Inn
- The Dead Lady of Clown Town
- The Dead and the Gone
- The Deadly Hunter
- The Death of Hope
- The Death of Sleep
- The Decision (novel)
- The Delinquents (1957 film)
- The Devereux
- The Devil and Daniel Mouse
- The Devil's Sleep
- The Dick Cavett Show
- The Dig (video game)
- The Dirdir
- The Disastrous Life of Saiki K. (film)
- The Discreet Charm of the Bourgeoisie
- The Discworld Almanak
- The Discworld Companion
- The Discworld Mapp
- The Disease
- The Dish
- The Dishwasher: Vampire Smile
- The Dispossessed
- The Divine Institutes
- The Doctor Falls
- The Dogs of War (song)
- The Dolphin, Hackney
- The Dolphins of Pern
- The Domes of Pico
- The Door Through Space
- The Doors of His Face, The Lamps of His Mouth
- The Dosadi Experiment
- The Double 0 Kid
- The Dove, Hammersmith
- The Dowry of the Angyar
- The Dragon King (adventure book)
- The Dragon's Call
- The Dream Is Alive
- The Dream Master
- The Dream Master (Steinmüller novel)
- The Dream of Lieschen Mueller
- The Dream of Rhonabwy
- The Dream-Quest of Unknown Kadath
- The Dream: Introduction into the Psychology of Dreams
- The Dreaming
- The Dreaming (comics)
- The Dreamland Chronicles
- The Dreams That Stuff Is Made Of
- The Dreams in the Witch House
- The Drill (band)
- The Drinky Crow Show
- The Drugs Don't Work
- The Duffer Brothers
- The Duke William, Stoke-on-Trent
- The Duke of Edinburgh, Brixton
- The Duke of Hamilton
- The Duke of Wellington, Marylebone
- The Duke of York, Fitzrovia
- The Duke's Head, Putney
- The Duplicated Man
- The Dust of Death
- The Dying Days
- The Dying Night
- The Dynamics of an Asteroid
- The E and B Experiment
- The Eagle, Cambridge
- The Eclipse (club)
- The Eclipse, or the Courtship of the Sun and Moon
- The Edgar Wallace
- The Education of Sonny Carson
- The Eerie Silence
- The Egg Collector
- The Egg, Beirut
- The Egyptian Theatre (Boise, Idaho)
- The Eight Bells, Hatfield
- The Elder Scrolls
- The Elder Scrolls Adventures: Redguard
- The Elder Scrolls II: Daggerfall
- The Elder Scrolls III: Bloodmoon
- The Elder Scrolls III: Morrowind
- The Elder Scrolls III: Tribunal
- The Elder Scrolls IV: Knights of the Nine
- The Elder Scrolls IV: Oblivion
- The Elder Scrolls IV: Shivering Isles
- The Elder Scrolls Online
- The Elder Scrolls Travels
- The Elder Scrolls V: Skyrim
- The Elder Scrolls V: Skyrim – Dawnguard
- The Elder Scrolls V: Skyrim – Dragonborn
- The Elder Scrolls V: Skyrim – Hearthfire
- The Elder Scrolls: Arena
- The Elder Scrolls: Blades
- The Elder Scrolls: Legends
- The Electric Boy
- The Elegant Universe
- The Empath
- The Emperor and the Golem
- The Emperor's New Cloak
- The Empire Strikes Back (novel)
- The Empress of Mars
- The End (Red Dwarf)
- The End (club)
- The End of All Things (novel)
- The End of Evangelion
- The End of Night (book)
- The End of Serialization as We Know It
- The End of the World (1916 film)
- The End of the World (Doctor Who)
- The Enemy Stars
- The Energy and Resources Institute
- The Engines of God
- The Ensign (video game)
- The Ensigns of Command
- The Enterprise Incident
- The Equatorie of the Planetis
- The Eric Andre Show
- The Etches Collection
- The Eternal Evil of Asia
- The European Radio Astronomy Club
- The Evil (1978 film)
- The Evil Dead
- The Evil Experiment
- The Exiles (Bradbury story)
- The Expanse (TV series)
- The Expanse (novel series)
- The Experiment (novel)
- The Extraordinary Journey of Celeste Garcia
- The Eye of the Beholder (Star Trek: The Animated Series)
- The Eyeless
- The FJ Holden
- The Fabric of Reality
- The Fabric of the Cosmos
- The Fabulous Baron Munchausen
- The Fabulous Bastard from Chicago
- The Fabulous Wonder Twins
- The Face (Vance novel)
- The Face of the Waters
- The Fall of Chronopolis
- The Fall of Hyperion (novel)
- The Fall of Neskaya
- The Fall of Yquatine
- The Falling Astronauts
- The Falling Torch
- The Farthest
- The Fat Duck
- The Father-thing
- The Feast of Axos
- The Feeling of Power
- The Fellowship and Star
- The Female Bunch
- The Ferry Boat Inn
- The Fifth Dimension of Sex
- The Fifth Element
- The Fifth Elephant
- The Fifth Man (novel)
- The Fight (Star Trek: Voyager)
- The Fight for Truth
- The Fillmore Detroit
- The Final Comedown
- The Final Cut (song)
- The Final Reflection
- The First (TV series)
- The First Men in the Moon
- The First Men in the Moon (1919 film)
- The First Men in the Moon (2010 film)
- The First Secret
- The First Three Minutes
- The Five Gold Bands
- The Fletcher Memorial Home
- The Flintstones Meet Rockula and Frankenstone
- The Flora
- The Flying Horse
- The Flying Saucer (song)
- The Flying Saucers Are Real
- The Forbidden Tower
- The Forester, Ealing
- The Forgotten Planet
- The Forgotten Toys
- The Formation of Vegetable Mould Through the Action of Worms
- The Fountain Inn, Gloucester
- The Fountain in the Park
- The Fountains of Paradise
- The Four Skillful Brothers
- The Fourth Kind
- The Fourth Man (1983 film)
- The Fox Goes Free
- The Fox, Twickenham
- The Free Press, Cambridge
- The Fridge (nightclub)
- The Fruit is Ripe
- The Funnies (Monica's Gang)
- The Galaxy Being
- The Galton Whistle
- The Game-Players of Titan
- The Ganymede Club
- The Garden of Rama
- The Garments of Caean
- The Gatehouse, Norwich
- The Geochemist's Workbench
- The Geographical Journal
- The George Hotel, Barton-upon-Humber
- The George, Hammersmith
- The George, Twickenham
- The Georgia Peaches
- The Ghost Brigades
- The Gingerdead Man
- The Girls from Thunder Strip
- The Girls on the Beach
- The Gladiators: Galactic Circus Games
- The Globalist (song)
- The Globe, Moorgate
- The Glory Stompers
- The Glove of Darth Vader
- The Gnome
- The Goblin Reservation
- The Goddess Bunny
- The Gods of Mars
- The Godwhale
- The Gold Range
- The Golden Apples of the Sun
- The Golden Bough
- The Golden Path (song)
- The Good Guy Fluctuation
- The Grand Design (book)
- The Grand Vizier's Garden Party
- The Grapes, Eccles
- The Grapes, Wandsworth
- The Great Devonian Controversy
- The Great Divorce
- The Great Gig in the Sky
- The Great Northern, Luton
- The Great Romance
- The Great Space Coaster
- The Greatest Event in Television History
- The Green Man at Inglewhite
- The Green Man, Hatfield
- The Green Man, Potters Bar
- The Green Meadow
- The Green Odyssey
- The Green Slime
- The Greyhound, Kensington
- The Gruffalo (film)
- The Gruffalo's Child (film)
- The Guardian of Isis
- The Gull
- The Gun, Coldharbour
- The Gunner's Dream
- The Guvernment
- The Guy from Harlem
- The Habitable Exoplanet Hunting Project
- The Halley Project
- The Hallo-Wiener
- The Halloween That Almost Wasn't
- The Halloween Tree
- The Halloween Tree (film)
- The Hammer of God (Clarke novel)
- The Han Solo Adventures
- The Han Solo Trilogy
- The Hand of Zei
- The Hansom Cab
- The Happiest Days of Our Lives
- The Hard Ride
- The Harlem Alhambra
- The Harp
- The Harp Bar
- The Harper Hall Trilogy
- The Harrow, London
- The Harrow, Steep
- The Hasty Hare
- The Haunted Mask
- The Hauntening
- The Haunting of Bly Manor
- The Haçienda
- The Heart, She Holler
- The Hebrew Hammer
- The Heirs of Hammerfell
- The Helen Lab Theatre
- The Hellcats
- The Helmet (Oceanus Procellarum)
- The Heritage of Hastur
- The Hermitage Hotel
- The Hero's Return
- The Hidden Reality
- The High Frontier: Human Colonies in Space
- The High Road (Broken Bells song)
- The Hills Have Eyes (1977 film)
- The Hitchhiker's Guide to the Galaxy (TV series)
- The Hitchhiker's Guide to the Galaxy (fictional)
- The Hitchhiker's Guide to the Galaxy (film)
- The Hitchhiker's Guide to the Galaxy (novel)
- The Hitchhiker's Guide to the Galaxy (video game)
- The Hive (Card and Johnston novel)
- The Hive (novella)
- The Hole Man
- The Hollow (2004 film)
- The Hollow Hills
- The Holly Bush, Elstree
- The Holly Bush, Hampstead
- The Hollywood Knights
- The Holocene
- The Honour of the Knights
- The Hoobs
- The Hop Poles
- The Hope, Smithfield
- The Hopkins Manuscript
- The Hork-Bajir Chronicles
- The Horn Blows at Midnight
- The Horns, Bull's Green
- The Horse and Groom, Hatfield
- The Horus Heresy
- The Hostage of Zir
- The Hot Box
- The House That Stood Still
- The House in the Night
- The House on Skull Mountain
- The House with a Clock in Its Walls
- The House with a Clock in Its Walls (film)
- The Howling Stones
- The Human Division
- The Human Tornado
- The Hunting of the Snark
- The Hutt
- The Hybrid (film)
- The Hydrogen Sonata
- The INT Photometric H-Alpha Survey
- The Ice Pirates
- The Ice Warriors
- The Immortals (Cosmos: A Spacetime Odyssey)
- The Impossible Dream (The Quest)
- The Impossible Planet
- The Incredible Melting Man
- The Indestructibles
- The Infinite Man
- The Infinite Vulcan
- The Inflationary Universe
- The Inheritance Trilogy (Douglas series)
- The Inhuman Torch
- The Inlander (Queensland Rail)
- The Inquisitor (Red Dwarf)
- The Inspector's Teeth
- The Integral Trees
- The Interpretation of Dreams
- The Invaders
- The Invaders (The Twilight Zone)
- The Invasion (film)
- The Investigator (TV pilot)
- The Invisible Enemy (Doctor Who)
- The Invisible Enemy (The Outer Limits)
- The Invisible Ray (1936 film)
- The Iron Dream
- The Isis Pedlar
- The Island Queen
- The Isolator
- The Ivy House
- The Jack and Triumph Show
- The Japanese Popstars
- The Japanese Sandman
- The Jaunt
- The Jellies!
- The Jerry Lewis Show
- The Jihad
- The Jodcast
- The Joey Bishop Show (talk show)
- The John Glenn Story
- The Joiners
- The Journal of Geology
- The Journeyman Project
- The Journeyman Project 2: Buried in Time
- The Journeyman Project 3: Legacy of Time
- The Journeyman Project: Pegasus Prime
- The Judgement of Isskar
- The Jugged Hare
- The Jupiter Effect
- The Keeper of the Isis Light
- The Keeper's Price
- The Kid Mero
- The Kid Who Would Be King
- The Killing Star
- The Killing of America
- The King's Dragon
- The King's England
- The King's Head and Eight Bells
- The King's Head, Amlwch
- The King's Head, Bristol
- The King's Head, Fulham
- The Klingon Dictionary
- The Klingon Hamlet
- The Klingon Way
- The Knife of Never Letting Go
- The Lacassane Company
- The Lady of the Black Moons
- The Lamb, Bloomsbury
- The Land Before Time VII: The Stone of Cold Fire
- The Land of Crimson Clouds
- The Large Scale Structure of Space-Time
- The Last American Virgin
- The Last Border
- The Last Castle (novella)
- The Last Colony
- The Last Continent
- The Last Day (Red Dwarf)
- The Last Days on Mars
- The Last Disaster
- The Last Dodo
- The Last Emperox
- The Last Enchantment
- The Last Express
- The Last Few Bricks
- The Last Halloween
- The Last Hero
- The Last House on the Left
- The Last Question
- The Last Starfighter
- The Last Train (TV series)
- The Last Wave
- The Late Shift (book)
- The Late Shift (film)
- The Late Show with Stephen Colbert
- The Late Shows
- The Lathe of Heaven
- The Lathe of Heaven (film)
- The Lebanese Rocket Society (film)
- The Left Hand of Darkness
- The Legacy of Heorot
- The Legally Prohibited from Being Funny on Television Tour
- The Legend of Boo-Kini Bottom
- The Legend of Nigger Charley
- The Legend of Sleepy Hollow
- The Legend of Spyro: The Eternal Night
- The Legend of Zelda: Link's Awakening
- The Legend of Zelda: Link's Awakening (2019 video game)
- The Legend of Zelda: Majora's Mask
- The Legend of Zelda: Majora's Mask 3D
- The Legion of Space
- The Letterman Foundation for Courtesy and Grooming
- The Liberation of Earth
- The Life (advertisement)
- The Light Fantastic
- The Light of Other Days
- The Light upon the Candlestick
- The Limelight
- The Lion Sleeps Tonight
- The Lion, Potters Bar
- The Listeners (novel)
- The Little Bear Movie
- The Little Czar
- The Little Endless Storybook
- The Little Ghost
- The Little People (The Twilight Zone)
- The Living Cosmos
- The Living Room
- The London Accord
- The Lonely
- The Long Game
- The Long Journey Home (video game)
- The Long Mars
- The Long Morrow
- The Long Rain
- The Long Way to a Small, Angry Planet
- The Lorelei Signal
- The Lost City of the Jedi
- The Lost Fleet
- The Lost Planet (novel)
- The Lost Saucer
- The Lost Worlds of 2001
- The Lost Worlds of Planet Earth
- The Lotus Caves
- The Lotus Eaters (Weinbaum)
- The Loveless
- The Lower Red Lion
- The LucasArts Archives
- The Lucidity Institute
- The Lunar Chronicles
- The Lunar Trilogy
- The Lunatic Republic
- The Lyin', the Watch and the Wardrobe
- The Machine That Won the War (short story)
- The Machine in Neptune's Garden
- The Mack
- The Mad Love Life of a Hot Vampire
- The Magdala
- The Magellanic Cloud
- The Magic School Bus (book series)
- The Magician (Tarot card)
- The Magicks of Megas-tu
- The Magnetic Telescope
- The Magnificent Seven (neutron stars)
- The Making of the Representative for Planet 8
- The Making of the Representative for Planet 8 (opera)
- The Mammoth Trilogy
- The Man Who Fell to Earth
- The Man Who Loved Mars
- The Man Who Was Never Born
- The Man from M.A.R.S. (1922 film)
- The Man from Mars
- The Man in the Maze (novel)
- The Man in the Moon Stayed Up Too Late
- The Man in the Moone
- The Man with the Power (The Outer Limits)
- The Mandalorian
- The Mandalorian (character)
- The Manitou
- The Manson Massacre
- The Mare's Nest
- The Marge-ian Chronicles
- The Marquis of Clanricarde
- The Marquis of Granby
- The Marriages Between Zones Three, Four and Five
- The Mars Generation
- The Mars Project
- The Martian (Weir novel)
- The Martian (film)
- The Martian Chronicles
- The Martian Chronicles (miniseries)
- The Martian Sphinx
- The Martian Star-Gazers
- The Martian Way
- The Martians (scientists)
- The Marzipan Pig
- The Masterharper of Pern
- The Masters of the Universe Role Playing Game
- The Maw (video game)
- The Memory of Whiteness
- The Menagerie (Star Trek: The Original Series)
- The Merchants of Venus
- The Merchants' War (Pohl novel)
- The Merlin Mystery
- The Merv Griffin Show
- The Message (Firefly)
- The Messenger (astronomy magazine)
- The Micropalaeontological Society
- The Midnight Sky
- The Midnight Special (train)
- The Mike Bullard Show
- The Milky Way (1940 film)
- The Milky Way Project
- The Millennial Project
- The Mineralogical Record
- The Mini-Skirt Mob
- The Minor Planet Bulletin
- The Miracle Workers (Vance story)
- The Mirror of Simple Souls
- The Mirrored Heavens
- The Misshapes
- The Mitre, Bayswater
- The Mitre, Greenwich
- The Mock Turtle's Song
- The Mohole Mystery
- The Monkey Hustle
- The Monster Club
- The Monster of Phineas-n-Ferbenstein
- The Monster of Piedras Blancas
- The Monsters Inside
- The Monthly Aspectarian
- The Moon Is a Harsh Mistress
- The Moon Maid
- The Moon Over Star
- The Moon and the Other
- The Moon is made of green cheese
- The Moonbase
- The Moons of Jupiter (short story)
- The Mothman Prophecies
- The Mouse on the Moon
- The Mouse on the Moon (novel)
- The Mouse's Tale
- The Mullewa
- The Murchison Fund
- The Murderbot Diaries
- The Muthers
- The Mysterious Stranger
- The Mysterons
- The Mystery of the Sphinx
- The Mystery of the Third Planet
- The Naked Sun
- The Naked Time
- The Narrow Way
- The National Map
- The Nature of Space and Time
- The Nautical Almanac
- The Needles
- The NeverEnding Story III
- The New Adventures of Flash Gordon
- The New Adventures of He-Man
- The New Inn, Ham Common
- The New Jedi Order
- The New Orleans Bingo! Show
- The New Rebellion
- The New Space Opera
- The New Space Opera 2
- The Newark Museum of Art
- The Night Watchman (1938 film)
- The Night of the Headless Horseman
- The Nightmare
- The Nightmare Before Christmas
- The Nightmare Before Christmas (soundtrack)
- The Nightmare Before Christmas: Oogie's Revenge
- The Nightmare Before Christmas: The Pumpkin King
- The Nile Song
- The Nine Billion Names of God
- The Nine Planets
- The Number Devil
- The Nun and the Devil
- The Nursery "Alice"
- The Oath (video game)
- The Observatory (journal)
- The Old Bank of England
- The Old Bell, Covent Garden
- The Old Bell, Hemel Hempstead
- The Old Bull and Bush
- The Old House, Ightham Common
- The Old Kings Arms
- The Old Shades
- The Old Straight Track
- The Olde Angel Inn
- The Olde Wine Shades
- The One with the Halloween Party
- The Only Running Footman
- The Open Solar Outdoors Test Field
- The Ophiuchi Hotline
- The Orbit Room
- The Organization (film)
- The Origin of the Milky Way (Rubens)
- The Origin of the Milky Way (Tintoretto)
- The Original Monster Mash
- The Orion Conspiracy
- The Orville
- The Other Side of the Mirror (anthology)
- The Outer Limits (1963 TV series)
- The Outer Limits (1995 TV series)
- The Outer Space Connection
- The Outer Worlds
- The Outforce
- The Outlaws of Mars
- The Outside Agency
- The Outward Urge
- The Overland
- The Owl & Co
- The Owl (TV series)
- The Owl (fairy tale)
- The Owl Box
- The Owl Who Married a Goose: An Eskimo Legend
- The Owl Who Was Afraid of the Dark
- The Oyster Question
- The Pace That Kills (1928 film)
- The Palm Tree, Mile End
- The Pandorica Opens
- The Paradox Men
- The Parallel
- The Paris Concilium (1348)
- The Particle at the End of the Universe
- The Parting of the Ways
- The Patchwork Girl
- The Patterns of Chaos
- The Paul Lynde Halloween Special
- The Paviours Arms
- The Peahen
- The Pendragon Cycle
- The Peony Pavilion
- The Perfect Pumpkin Pie
- The Perils of Gwendoline in the Land of the Yik-Yak
- The Perseverance
- The Phantom Empire
- The Phantom of the Opera (song)
- The Phene
- The Pilgrim's Progress
- The Pillars of Eternity
- The Pineapple, Kentish Town
- The Pirate Planet
- The Pirates of Dark Water
- The Pirates of Orion
- The Planck Dive
- The Planet Savers
- The Planet of Doubt
- The Planet of Youth
- The Planetary Society
- The Planets
- The Planets (1999 TV series)
- The Planets (2019 TV series)
- The Playbirds
- The Player of Games
- The Plough and Stars
- The Plough at Eaves
- The Pluto Files
- The Pnume
- The Pom Pom Girls
- The Port of Peril
- The Porter Garden Telescope
- The Post War Dream (song)
- The Practical Joker
- The Practice Effect
- The Pratchett Portfolio
- The Predator (film)
- The Prefect
- The Price of Paradise
- The Principle
- The Printworks (Manchester)
- The Prisoner of Zhamanak
- The Problem with Popplers
- The Professional Geographer
- The Promenade Shops at Saucon Valley
- The Prophecy (Applegate novel)
- The Proud Rider
- The Prowler (1981 film)
- The Pumpkin Karver
- The Punch Tavern
- The Puppet Masters
- The Purple Monster Strikes
- The Purple People Eater
- The Puzzle Planet
- The Pyralis Effect
- The Q and the Grey
- The Quantum Thief
- The Quantum Universe
- The Queen Adelaide
- The Queen of Zamba
- The Queen's Head, Sandridge
- The Queens, Crouch End
- The Quiet War
- The Rabbit Who Wants to Fall Asleep
- The Raccoons and the Lost Star
- The Race for Space (film)
- The Radio Man
- The Railway, Altrincham
- The Raven (song)
- The Raven Project
- The Rebel Rousers
- The Reckoning (Star Trek: Deep Space Nine)
- The Red Bed
- The Red Lion, Hatfield
- The Red Peri
- The Renegades of Pern
- The Rescue of Princess Blobette
- The Resurrection Casket
- The Return (Aldrin and Barnes novel)
- The Return of Superfly
- The Return of the Living Dead
- The Revelation in Storm and Thunder
- The Rift (Allan novel)
- The Right Stuff (TV series)
- The Right Stuff (book)
- The Right Stuff (film)
- The Rights of Nature in Ecuador - Sumak Kawsay
- The Ringtailed Rhinoceros
- The Ringworld Engineers
- The Risen Empire
- The Rising Force
- The Rising of the Shield Hero
- The Road Not Taken (short story)
- The Road to Reality
- The Road to Ruin (1928 film)
- The Road to Ruin (1934 film)
- The Robots of Dawn
- The Rocket to the Moon (novel)
- The Rocket, Euston
- The Rocky Horror Glee Show
- The Rocky Horror Picture Show
- The Roebuck
- The Rolling Stones (novel)
- The Rookie Bear
- The Roommates
- The Rose and Crown, Clay Hill
- The Rowan
- The Royal Oak, Bethnal Green
- The Royal Scotsman
- The Royale
- The Russians Were Rushin', the Yanks Started Yankin'
- The Sacrifice (Applegate novel)
- The Saga of Seven Suns
- The Saga of Shadows
- The Salisbury Museum
- The Salutation Inn
- The Sam Plenty Cavalcade of Action Show Plus Singing!
- The Sand Reckoner
- The Sandkings
- The Sandman (1991 film)
- The Sandman (Doctor Who audio drama)
- The Sandman (TV series)
- The Sandman (book)
- The Sandman (comic book)
- The Sandman (short story)
- The Sandman Companion
- The Sandman Saga (Superman)
- The Sandman Universe
- The Sandman: A Game of You
- The Sandman: Book of Dreams
- The Sandman: Brief Lives
- The Sandman: Dream Country
- The Sandman: Endless Nights
- The Sandman: Fables & Reflections
- The Sandman: Overture
- The Sandman: Preludes & Nocturnes
- The Sandman: Season of Mists
- The Sandman: The Doll's House
- The Sandman: The Dream Hunters
- The Sandman: The Kindly Ones
- The Sandman: The Wake
- The Sandman: Worlds' End
- The Sands of Mars
- The Santa Clause 2
- The Satan Pit
- The Saturn Game
- The Savage Seven
- The Scarecrow (song)
- The Scary Sleepover
- The School Teacher
- The Science of Aliens
- The Science of Discworld
- The Science of Discworld II: The Globe
- The Science of Discworld III: Darwin's Watch
- The Science of Discworld IV: Judgement Day
- The Science of Interstellar
- The Science of Sleep
- The Scoots
- The Scotian (train)
- The Screaming Skull
- The Scumfrog
- The Seal of Nehahra
- The Search for Life: The Drake Equation
- The Secret Sense
- The Secret of Saturn's Rings
- The Secret of Sinharat
- The Secret of the Martian Moons
- The Secret of the Ninth Planet
- The Secret of the Selenites
- The Secret of the Sword
- The Secret of the Universe
- The Seed
- The Seeds of Death
- The Sentimental Agents in the Volyen Empire
- The Sentinel (short story)
- The Series Has Landed
- The Sexplorer
- The Shadow Matrix
- The Shakespeare, Farnworth
- The Shattered Chain
- The Shepherd's Crown
- The Sheriff and the Satellite Kid
- The Shift Project
- The Ship of Monsters
- The Ship, Hart Street
- The Ship, Lime Street
- The Ship, New Cavendish Street
- The Shipwrights Arms
- The Shiva Option
- The Shivering Truth
- The Shooting Star
- The Shovel, Cowley
- The Show Must Go On (Pink Floyd song)
- The Shuckburgh Arms, Chelsea
- The Side Show (nightclub)
- The Siesta (Van Gogh)
- The Signal (podcast)
- The Silence of the Clamps
- The Silent Cartographer
- The Silent Star
- The Silent Stars Go By (novel)
- The Silkie (novel)
- The Silver Key
- The Silver Kiss
- The Simpsons: Night of the Living Treehouse of Horror
- The Sims 4: Get to Work
- The Sims 4: Star Wars: Journey to Batuu
- The Simulacra
- The Sinful Nuns of Saint Valentine
- The Single Girls
- The Singular Universe and the Reality of Time
- The Sirens of Mars
- The Sirens of Titan
- The Sirian Experiments
- The Sirius Mystery
- The Six Bells
- The Sixth Extinction: An Unnatural History
- The Skies of Pern
- The Sky (magazine)
- The Sky Above Us with James Albury
- The Sky People
- The Sky So Big and Black
- The Sky at Night
- The Skyfire Puzzle
- The Skylark of Space
- The Slaver Weapon
- The Sleeper Awakes
- The Sleeping Girl of Turville
- The Sleepwalkers (Koestler book)
- The Slutty Pumpkin Returns
- The Smashing Bird I Used to Know
- The Smoke Ring (novel)
- The Soft Weapon
- The Solar Film
- The Solar System and Back
- The Solarians
- The Solus Project
- The Songs of Distant Earth
- The Songs of Distant Earth (album)
- The Sophia Centre
- The Sorcerer's Apprentice (2010 film)
- The Soul of Nigger Charley
- The Sound Factory Bar
- The Sound of Her Voice
- The Space Bar
- The Space Barons
- The Space Between Us (film)
- The Space Explorers
- The Space Gods Revealed
- The Space Machine
- The Space Merchants
- The Space Movie
- The Space Observatory (Observatoire de l'Espace)
- The Space Opera Renaissance
- The Space Pirates
- The Space Report
- The Space Show
- The Space Trilogy
- The Spaceguard Foundation
- The Spaceship Company
- The Spaceships of Ezekiel
- The Sparrow (novel)
- The Spell Sword
- The Spierig Brothers
- The Spook Who Sat by the Door (film)
- The Spy Next Door
- The Squire of Gothos
- The Stand
- The Stand (1994 miniseries)
- The Star (Clarke short story)
- The Star (The Twilight Zone)
- The Star (Wells short story)
- The Star Conquerors
- The Star of Bethlehem (2007 film)
- The Starlost
- The Starmen
- The Starry Night
- The Stars Are Ours!
- The Stars My Destination
- The Stars, Like Dust
- The Stars: A New Way to See Them
- The State of the Art
- The Station (video game)
- The Station nightclub fire
- The Station, Stoneleigh
- The Stealers of Dreams
- The Sten Chronicles
- The Stepmother (film)
- The Stone Dogs
- The Stone Gods (novel)
- The Stones of Blood
- The Stones of Nomuru
- The Stranger (1973 film)
- The Streets of Ankh-Morpork
- The Struggle for Empire: A Story of the Year 2236
- The Student Nurses
- The Succubus (sculpture)
- The Summer of Massacre
- The Sun Makers
- The Sun in culture
- The Sunlight League
- The Surrogates
- The Survivor (Star Trek: The Animated Series)
- The Swan Inn, Ruislip
- The Swan, Hammersmith
- The Swan, Little Totham
- The Swan, West Wycombe
- The Swarm (Card and Johnston novel)
- The Sweet Ride
- The Swinging Barmaids
- The Sword in the Stone (1963 film)
- The Sword in the Stone (novel)
- The Sword of Aldones
- The Sword of Rhiannon
- The Swords of Zinjaban
- The T.V. of Tomorrow
- The Tabard, Chiswick
- The Tachypomp
- The TaiWan Ionospheric Model
- The Tail of Beta Lyrae
- The Tale of the Bamboo Cutter
- The Tale of the Princess Kaguya
- The Tales of Hoffmann
- The Taybor
- The Tea Clipper
- The Teacher (1974 film)
- The Tech Interactive
- The Technomancer
- The Telescope (magazine)
- The Tender Trap (club)
- The Terratin Incident
- The Terrornauts
- The Texas Chain Saw Massacre
- The Thaw Session
- The Theory of Everything (2014 film)
- The Theory of Island Biogeography
- The Thickety
- The Thin Ice
- The Thing (1982 film)
- The Thing (2011 film)
- The Thing from Another World
- The Thing with Two Heads
- The Tholian Web
- The Three Doctors (Doctor Who)
- The Three Stags' Heads
- The Three Stigmata of Palmer Eldritch
- The Three Stooges in Orbit
- The Three-Body Problem (novel)
- The Thrill Killers
- The Throne of Saturn (novel)
- The Tilbury, Datchworth
- The Time Machine (2002 film)
- The Time Trap
- The Timekeeper
- The Tip of the Zoidberg
- The Tipperary
- The Tommyknockers
- The Tommyknockers (miniseries)
- The Tomorrow People (novel)
- The Tonight Show Starring Jimmy Fallon
- The Tonight Show with Conan O'Brien
- The Toolbox Murders
- The Tooth Fairy (film)
- The Touchables (film)
- The Tower (Tarot card)
- The Tower of Zanid
- The Town Hall (New York City)
- The Town That Dreaded Sundown
- The Toxic Avenger (film)
- The Train Job
- The Transformers: The Movie
- The Treasure Planet
- The Trial (song)
- The Trials of Galileo
- The Trouble With Gravity
- The Trout Inn
- The Truce at Bakura
- The Truth (The X-Files)
- The Truth (novel)
- The Tsuranga Conundrum
- The Twelve Bars of Christmas
- The Two Who Stole the Moon
- The Ultimate Evil
- The Ultimate Treasure
- The Uncertainty Principle (The Spectacular Spider-Man)
- The Unholy War
- The Uninvited (TV series)
- The Universe (TV series)
- The Universe for Beginners
- The Universe in a Nutshell
- The Unnatural (The X-Files)
- The Unscrambler
- The Unseen University Challenge
- The Unseen University Cut Out Book
- The Uplift War
- The Ur-Quan Masters
- The Valley Where Time Stood Still
- The Vampira Show
- The Vampire (1957 film)
- The Vampyr: A Soap Opera
- The Variable Man
- The Vast of Night
- The Venom Trees of Sunga
- The Venture Bros.
- The Victoria, Bayswater
- The Victoria, Durham
- The Victoria, Great Harwood
- The Victoria, Richmond
- The Vine, Pamphill
- The Vinelander
- The Violent Years
- The Viper, Mill Green
- The Virgin of Zesh
- The Vision of Adamnán
- The Visitor (Star Trek: Deep Space Nine)
- The Vixens of Kung Fu
- The Voice of Midnight
- The Voices of Mars
- The Volunteer Arms, Barton-upon-Humber
- The Voyage (opera)
- The Voyage of the Space Beagle
- The Voyager Conspiracy
- The Vulcan Hello
- The W.A.N.D. (The Will Always Negates Defeat)
- The Wachowskis
- The Wallies of Wessex
- The Wandering Earth
- The War (Angels & Airwaves song)
- The War Against the Rull
- The War for Late Night
- The War in Space
- The War of the Worlds (1938 radio drama)
- The War of the Worlds (British TV series)
- The Warehouse Project
- The Warlock in Spite of Himself
- The Warp Factor
- The Warrington, Maida Vale
- The Washington, Belsize Park
- The Watch (2012 film)
- The Watch (TV series)
- The Waters of Mars
- The Way to Amalthea
- The Weapon (short story)
- The Weapon Too Dreadful to Use
- The Wee Free Men
- The Well-Mannered War
- The Werewolf of Washington
- The Westland
- The Westlander
- The Wheatsheaf, Fitzrovia
- The Wheatsheaf, Southwark
- The Wheatsheaf, St Helens
- The Wheel in Space
- The Whisperer in Darkness
- The White Bear, Clerkenwell
- The White Chamber
- The White Dragon (novel)
- The White Hart, South Mimms
- The White Horse, Burnham Green
- The White Horse, Enfield
- The White Horse, Fulham
- The White Horse, Hertford
- The White Horse, Potters Bar
- The White Lion, St Albans
- The White Swan, Covent Garden
- The Whitehouse (pub)
- The Whole Shebang: A State-of-the-Universe(s) Report
- The Whoopi Goldberg Show
- The Wife Swappers
- The Wild Angels
- The Wild East
- The Wild Man of the Navidad
- The Wild One
- The Wild, Wild World of Jayne Mansfield
- The Wilton Arms
- The Winchester, Highgate
- The Wind Rises
- The Winds of Darkover
- The Winds of Dune
- The Wit and Wisdom of Discworld
- The Witch Who Came from the Sea
- The Witches Hammer
- The Witches of Karres
- The Wiz (film)
- The Wizard of Mars
- The Wizard of Oz (1939 film)
- The Woman Hunt
- The Woman in the Window
- The Women of Apollo
- The Wonder (pub)
- The Wonder of It All (film)
- The Wonderful Flight to the Mushroom Planet
- The Woodman
- The Woods (comic)
- The Word for World Is Forest
- The Working Girls
- The World At Night
- The World Set Free (Cosmos: A Spacetime Odyssey)
- The World Wreckers
- The World of Poo
- The World's End, Chelsea
- The Worm Ouroboros
- The Worst Witch (film)
- The Worst of Faces of Death
- The Wounded Sky
- The Wrestlers, Hatfield
- The X-Files
- The X-Files (film)
- The Xtacles
- The Yeah Yeah Yeah Song (With All Your Power)
- The Year When Stardust Fell
- The Yorkshire Grey
- The Young Nurses
- The Young Runaways (1968 film)
- The Zen Gun
- The dose makes the poison
- The sixteen dreams of King Pasenadi
- TheSky (astronomy software)
- Theaetetus (crater)
- Theano (philosopher)
- Theatre Bizarre
- Theatre Cedar Rapids
- Theatres des Vampires
- Theatron (club)
- Theban Mapping Project
- Theban Triad
- Thebe (moon)
- Thebe Medupe
- Thebes, Egypt
- Thebit (crater)
- Theft of fire
- Theia (planet)
- Theia Mons
- Theiler (crater)
- Their Spirits Circle the Earth
- Thello
- Thelma Rodgers
- Thelxinoe (moon)
- Thema Mundi
- Thematic Mapper
- Theme park live adaptations of The Lion King
- Themes in Avatar
- Themis (hypothetical moon)
- Themis family
- Themis programme
- Themisto (moon)
- Themistoclea
- Thendara House
- Theo Keating
- Theo Parrish
- Theodor Brorsen
- Theodor Jacobsen Observatory
- Theodor W. Hänsch
- Theodor von Oppolzer
- Theodor von Schubert
- Theodore Dunham Jr.
- Theodore Freeman
- Theodore Hancock
- Theodore Lyman IV
- Theodore Meliteniotes
- Theodore Sturgeon
- Theodore Wirgman
- Theodore von Kármán
- Theon Junior (crater)
- Theon Senior (crater)
- Theon of Alexandria
- Theon of Smyrna
- Theophanes (crater)
- Theophilus (crater)
- Theophilus of Edessa
- Theophrastus (crater)
- Theophylact Simocatta
- Theoretical and Applied Climatology
- Theoretical astronomy
- Theoretical gravity
- Theoretical motivation for general relativity
- Theoretical oxygen demand
- Theoretical planetology
- Theories about Stonehenge
- Theories of urban planning
- Theory of everything
- Theory of the Earth
- Theory of tides
- Therapy (New York City)
- Thereza Dillwyn Llewelyn
- Therion (software)
- Thermacetogenium phaeum
- Thermal Emission Spectrometer
- Thermal Micrometeoroid Garment
- Thermal and Evolved Gas Analyzer
- Thermal blanket
- Thermal desorption
- Thermal equator
- Thermal infrared spectroscopy
- Thermal pollution
- Thermal printing
- Thermal runaway
- Thermal time scale
- Thermales
- Thermally stimulated current spectroscopy
- Thermanaeromonas
- Thermanaeromonas burensis
- Thermanaeromonas toyohensis
- Thermasporomyces composti
- Thermicanus aegyptius
- Thermidor
- Thermionic converter
- Thermithiobacillus
- Thermithiobacillus tepidarius
- Thermoacidophile
- Thermoanaerobacter
- Thermoanaerobacter acetoethylicus
- Thermoanaerobacter brockii
- Thermoanaerobacter ethanolicus
- Thermoanaerobacter italicus
- Thermoanaerobacter kivui
- Thermoanaerobacter mathranii
- Thermoanaerobacter pseudethanolicus
- Thermoanaerobacter siderophilus
- Thermoanaerobacter thermocopriae
- Thermoanaerobacterales
- Thermoanaerobacterales Family III
- Thermoanaerobacterales Family IV
- Thermoanaerobacterium aotearoense
- Thermoanaerobacterium thermosaccharolyticum
- Thermochromic ink
- Thermochromism
- Thermocladium
- Thermocline
- Thermococcaceae
- Thermococcales
- Thermococci
- Thermococcus alcaliphilus
- Thermococcus barophilus
- Thermococcus celer
- Thermococcus chitonophagus
- Thermococcus gammatolerans
- Thermococcus hydrothermalis
- Thermococcus kodakarensis
- Thermococcus litoralis
- Thermococcus peptonophilus
- Thermococcus profundus
- Thermococcus stetteri
- Thermodesulfobium
- Thermodesulfobium acidiphilum
- Thermodesulfobium narugense
- Thermodesulforhabdus norvegica
- Thermodiscus
- Thermodynamics of the universe
- Thermofilaceae
- Thermofilum
- Thermoflavimicrobium
- Thermoflavimicrobium dichotomicum
- Thermographic camera
- Thermomesochra
- Thermomonosporaceae
- Thermonema lapsum
- Thermonema rossianum
- Thermopause
- Thermophile
- Thermoplasma
- Thermoplasma acidophilum
- Thermoplasma volcanium
- Thermoplasmata
- Thermoplasmataceae
- Thermoplasmatales
- Thermoproteaceae
- Thermoproteales
- Thermoprotei
- Thermoproteus
- Thermosinus carboxydivorans
- Thermosome
- Thermosphaera
- Thermosphere
- Thermostability
- Thermostad
- Thermosyntropha
- Thermotoga elfii
- Thermotoga hypogea
- Thermotoga lettingae
- Thermotoga naphthophila
- Thermotoga neapolitana
- Thermotoga petrophila
- Thermotoga subterranea
- Thermotogae
- Thermus
- Thermus antranikianii
- Thermus aquaticus
- Thermus igniterrae
- Thermus thermophilus
- Thesan
- These Dreams
- These Final Hours
- Thessaloniki Science Center and Technology Museum
- Theta Andromedae
- Theta Antliae
- Theta Apodis
- Theta Aquarii
- Theta Aquilae
- Theta Arae
- Theta Arietis
- Theta Aurigae
- Theta Boötis
- Theta Cancri
- Theta Canis Majoris
- Theta Capricorni
- Theta Carinae
- Theta Cassiopeiae
- Theta Centauri
- Theta Centaurids
- Theta Cephei
- Theta Ceti
- Theta Chamaeleontis
- Theta Circini
- Theta Columbae
- Theta Coronae Australis
- Theta Coronae Borealis
- Theta Crateris
- Theta Crucis
- Theta Cygni
- Theta Delphini
- Theta Doradus
- Theta Draconis
- Theta Eridani
- Theta Geminorum
- Theta Gruis
- Theta Herculis
- Theta Hydrae
- Theta Hydri
- Theta Indi
- Theta Leonis
- Theta Leporis
- Theta Librae
- Theta Lupi
- Theta Lyrae
- Theta Microscopii
- Theta Muscae
- Theta Normae
- Theta Octantis
- Theta Ophiuchi
- Theta Orionis
- Theta Pavonis
- Theta Pegasi
- Theta Persei
- Theta Pictoris
- Theta Piscis Austrini
- Theta Piscium
- Theta Pyxidis
- Theta Reticuli
- Theta Sagittae
- Theta Sagittarii
- Theta Scorpii
- Theta Sculptoris
- Theta Serpentis
- Theta Tauri
- Theta Trianguli Australis
- Theta Tucanae
- Theta Ursae Majoris
- Theta Ursae Minoris
- Theta Virginis
- Theta Volantis
- Theta1 Crucis
- Theta1 Microscopii
- Theta1 Orionis A
- Theta1 Orionis B
- Theta1 Orionis C
- Theta1 Orionis D
- Theta1 Orionis E
- Theta1 Sagittarii
- Theta2 Crucis
- Theta2 Microscopii
- Theta2 Orionis
- Theta2 Sagittarii
- They Call Me Mister Tibbs!
- They Live
- They Saved Hitler's Brain
- They Saved Lisa's Brain
- They're Made Out of Meat
- Thibault Damour
- Thick disk
- Thicke of the Night
- Thickness (geology)
- Thief of Time
- Thiel (crater)
- Thierry Pauwels
- Thiessen (crater)
- Thijs de Graauw
- Thila (crater)
- Thin Air (Morgan novel)
- Thin disk
- Thin filament pyrometry
- Thing (comics)
- Things Past (Star Trek: Deep Space Nine)
- Thinking like a mountain
- Thinktank, Birmingham Science Museum
- Thinned-array curse
- Thiohalospira halophila
- Thiolava
- Thiomicrospira aerophila
- Thira (crater)
- Third Cambridge Catalogue of Radio Sources
- Third Pole
- Third Stone from the Sun
- Third from the Sun
- Third principal meridian
- Third-party evidence for Apollo Moon landings
- Thirty Days (Star Trek: Voyager)
- Thirty Meter Telescope
- This Ain't Avatar XXX
- This Alien Shore
- This Here Giraffe
- This Immortal
- This Is Halloween
- This Is Music
- This Island Earth
- Thixotropy
- Thokcha
- Tholin
- Tholus
- Thomagata Patera
- Thomas A. Matthews
- Thomas A. Mutch
- Thomas Akers
- Thomas Baron
- Thomas Basnett
- Thomas Beecham
- Thomas Blunt (optician)
- Thomas Bopp
- Thomas Bradwardine
- Thomas Byles
- Thomas C. Katsouleas
- Thomas Cavendish
- Thomas Clausen (mathematician)
- Thomas Cooke (scientific instrument maker)
- Thomas David Jones
- Thomas Davis (Cook Islands politician)
- Thomas Digges
- Thomas E. Latimer
- Thomas Edwin Nevin
- Thomas Flower Ellis
- Thomas Frederick Colby
- Thomas Glanville Taylor
- Thomas Godfrey (inventor)
- Thomas Gold
- Thomas Grubb
- Thomas Gwyn Elger
- Thomas Henderson (astronomer)
- Thomas Henning
- Thomas Henry Shadwell Clerke
- Thomas Higson (cricketer, born 1873)
- Thomas Hornsby
- Thomas Howes (hostage)
- Thomas Ignatius Maria Forster
- Thomas Ingram Kynaston Lloyd
- Thomas J. Balonek
- Thomas J. Hennen
- Thomas J. Kelly (aerospace engineer)
- Thomas Jacomb Hutton
- Thomas Jefferson Jackson See
- Thomas Kidd (illustrator)
- Thomas Kilduff
- Thomas King (astronomer)
- Thomas King Observatory
- Thomas Kukula
- Thomas Lera
- Thomas Lincoln Casey Jr.
- Thomas M. Baer
- Thomas M. Disch
- Thomas Maclear
- Thomas Marshburn
- Thomas McMurtry
- Thomas Melvill
- Thomas Michael Donahue
- Thomas Norris (1765–1852)
- Thomas P. Stafford
- Thomas Pereira
- Thomas Pesquet
- Thomas Pierson
- Thomas Plumb
- Thomas Reiter
- Thomas Richard Owen
- Thomas Richardson (cartographer)
- Thomas Romney Robinson
- Thomas Royds
- Thomas Sever
- Thomas T. Veblen
- Thomas Thorp (scientific instrument manufacturer)
- Thomas Townsend Brown
- Thomas Wehr
- Thomas Westbrook Waldron (consul)
- Thomas William Webb
- Thomas Wright Hill
- Thomas Zebrowski
- Thomas Zurbuchen
- Thomas precession
- Thomasine & Bushrod
- Thompson Observatory
- Thomson (crater)
- Thomson and Thompson
- Thomson scattering
- Thor
- Thor (Comico Comics)
- Thor (Marvel Comics)
- Thor (Ultimate Marvel character)
- Thor (film)
- Thor (rocket family)
- Thor (satellite)
- Thor (volcano)
- Thor 5
- Thor DSV-2U
- Thor experiment
- Thor-Agena
- Thor-Burner
- Thor-Delta
- Thor: Ragnarok
- Thor: The Dark World
- Thorarinsson Medal
- Thorgal
- Thorium Energy Alliance
- Thorne–Hawking–Preskill bet
- Thorne–Żytkow object
- Thornton Hunt Inn
- Thornton Leigh Page
- Thorson's rule
- Thorvald N. Thiele
- Thoth
- ThothX Tower
- Thou Shalt Not Kill... Except
- Thought Contagion
- Thought recording and reproduction device
- Thout
- Thrayodashi
- Thread of the Silkworm
- Three Books of Occult Philosophy
- Three Busy Debras
- Three College Observatory
- Three Horseshoes, Southall
- Three Horseshoes, Whitwick
- Three Pagodas Fault
- Three Poles Challenge
- Three Stars (Chinese constellation)
- Three Tough Guys
- Three Tuns, Uxbridge
- Three in the Attic
- Three the Hard Way (film)
- Three-body problem
- Three-dimensional losses and correlation in turbomachinery
- Three-dimensional quartz phenolic
- Three-field system
- Three-mirror anastigmat
- Three-stage-to-orbit
- Three-surface aircraft
- Three-torus model of the universe
- Threebear (soil)
- Threshold (TV series)
- Threshold model
- Thriller (song)
- Thronateeska Heritage Center
- Throstles Nest Hotel, Scotland Road
- Through Distant Worlds and Times
- Through the Looking Glass (Star Trek: Deep Space Nine)
- Through the Looking-Glass
- Throughfall
- Throughflow
- Thru the Mirror
- Thru the Moebius Strip
- Thrust (video game)
- Thrusters (spacecraft)
- Thrymr (moon)
- Thuban
- Thud!
- Thule Tracking Station
- Thulinius
- Thumba Equatorial Rocket Launching Station
- Thundarr the Barbarian
- Thunder
- Thunder Warrior
- ThunderCats (1985 TV series)
- ThunderCats (2011 TV series)
- Thunderbirds (2004 film)
- Thunderbirds (TV series)
- Thunderbirds Are Go
- Thunderbolt
- Thunderlord!
- Thunderpuss
- Thunderstone (TV series)
- Thunderstorm
- Thuraya
- Thuththiri
- Thymol blue
- Thymolphthalein
- Thyone (moon)
- Thyratron
- Thyroptera
- Thyrotoxicosis factitia
- Thābit ibn Qurra
- TiLR
- TiSPACE
- Tia Keyes
- Tiamat's Wrath
- Tian Shi (crater)
- TianQin
- Tiangong program
- Tiangong-1
- Tiangong-2
- Tiangong-3
- Tiangou
- Tianhe (space station module)
- Tianhui 1B
- Tianlian I
- Tianlian II
- Tianlong
- Tianwen-1
- Tianzhou (spacecraft)
- Tianzhou 1
- Tiber Creek
- Tibere
- Tibetan Plateau
- Tibetan astrology
- Tibetan astronomy
- Tick, Tick, Tick (film)
- Tidal acceleration
- Tidal atlas
- Tidal circularization
- Tidal course
- Tidal diamond
- Tidal disruption event
- Tidal downsizing
- Tidal flooding
- Tidal force
- Tidal heating
- Tidal heating of Io
- Tidal irrigation
- Tidal island
- Tidal locking
- Tidal marsh
- Tidal power
- Tidal prism
- Tidal race
- Tidal range
- Tidal resonance
- Tidal river
- Tidal scour
- Tidal shock
- Tidal strait
- Tidal stripping
- Tidal tail
- Tidal tensor
- Tidal triggering of earthquakes
- Tidally detached exomoon
- Tide
- Tide dial
- Tide pool
- Tide-Predicting Machine No. 2
- Tideline
- Tidewater glacier cycle
- Tien Shan Astronomical Observatory
- Tier-scalable reconnaissance
- Tierra del Fuego Igneous and Metamorphic Complex
- Tifton (soil)
- Tiga (musician)
- Tiger (zodiac)
- Tiger bush
- Tiger stripes (Enceladus)
- TigriSat
- Tigris
- Tigtone
- Tijdschrift voor economische en sociale geografie
- Tijuana Cultural Center
- Tik Tik Tik (2018 film)
- Tikhiy Don (train)
- Tikhomirov (crater)
- Tikhonravov (crater)
- Tikhov (Martian crater)
- Tikhov (lunar crater)
- Tikka to Ride
- Tiling (crater)
- Till
- Till plain
- Tilla Satellite Launch Centre
- Tillage
- Tilt test (geotechnical engineering)
- Tilth
- Tim & Eric's Bedtime Stories
- Tim Bedding
- Tim Burt
- Tim Burton
- Tim Commerford
- Tim Hunter (astronomer)
- Tim Jarvis
- Tim Kirk
- Tim Maudlin
- Tim Naish
- Tim O'Riordan
- Tim Peake
- Tim Sumner (physicist)
- Tim White (artist)
- Tim Yap
- Tim and Eric Awesome Show, Great Job!
- Tim de Zeeuw
- Timaeus (crater)
- Timaeus (dialogue)
- Timaeus of Locri
- Timation
- Timbuktu (crater)
- Time (Pink Floyd song)
- Time Crash
- Time Enough for Love
- Time Is Running Out (Muse song)
- Time Out of Joint
- Time Renegades
- Time Served
- Time Squared (Star Trek: The Next Generation)
- Time Supper Club
- Time Trek
- Time Variance Authority
- Time Warp (song)
- Time and Again (Star Trek: Voyager)
- Time and Mr. Bass
- Time capsule
- Time delay and integration
- Time domain astronomy
- Time for the Stars
- Time of concentration
- Time of flight
- Time of ponding
- Time scale
- Time smearing
- Time standard
- Time to first fix
- Time's Arrow (Star Trek: The Next Generation)
- Time's Orphan
- Time-Resolved Observations of Precipitation structure and storm Intensity with a Constellation of Smallsats
- Time-domain diffuse optics
- Time-domain reflectometer
- Time-resolved spectroscopy
- Time-varying microscale model
- TimeSplitters 2
- Timekeeping on Mars
- Timelapse of the Future
- Timeless (Star Trek: Voyager)
- Timelike homotopy
- Timelike simply connected
- Timeline of Cassini–Huygens
- Timeline of Chinese astronomy
- Timeline of Galileo (spacecraft)
- Timeline of Gravity Probe B
- Timeline of Jodrell Bank Observatory
- Timeline of Mars Reconnaissance Orbiter
- Timeline of Mars Science Laboratory
- Timeline of Opportunity (rover)
- Timeline of Rosetta (spacecraft)
- Timeline of STS-121
- Timeline of STS-51-L
- Timeline of Solar System astronomy
- Timeline of Solar System exploration
- Timeline of artificial satellites and space probes
- Timeline of astronomical maps, catalogs, and surveys
- Timeline of astronomy
- Timeline of black hole physics
- Timeline of cosmological theories
- Timeline of discovery of Solar System planets and their moons
- Timeline of epochs in cosmology
- Timeline of first artificial satellites by country
- Timeline of first images of Earth from space
- Timeline of first orbital launches by country
- Timeline of geology
- Timeline of glaciation
- Timeline of gravitational physics and relativity
- Timeline of knowledge about galaxies, clusters of galaxies, and large-scale structure
- Timeline of knowledge about the interstellar and intergalactic medium
- Timeline of longest spaceflights
- Timeline of meteorology
- Timeline of paleontology
- Timeline of planetariums
- Timeline of private spaceflight
- Timeline of rocket and missile technology
- Timeline of solar astronomy
- Timeline of solar cells
- Timeline of space exploration
- Timeline of space travel by nationality
- Timeline of spaceflight
- Timeline of stellar astronomy
- Timeline of telescope technology
- Timeline of telescopes, observatories, and observing technology
- Timeline of the James Webb Space Telescope
- Timeline of the Space Race
- Timeline of the development of tectonophysics (after 1952)
- Timeline of the development of tectonophysics (before 1954)
- Timeline of the geologic history of the United States
- Timeline of volcanism on Earth
- Timeline of white dwarfs, neutron stars, and supernovae
- Timescape (Star Trek: The Next Generation)
- Timeslides
- Timewave (Red Dwarf)
- Timing (film)
- Timir Datta
- Timiryazev (crater)
- Timo Maas
- Timocharis (crater)
- Timothy B. Spahr
- Timothy Beers
- Timothy Creamer
- Timothy Ferris
- Timothy Good
- Timothy Hunter
- Timothy John O'Brien
- Timothy Kopra
- Timothy Leary
- Timothy Schrabback
- Timur Eneev
- Timycha
- Tin Bider crater
- Tin Man (Star Trek: The Next Generation)
- Tin-Tin Kyrano
- Tina and the Real Ghost
- Tinaja
- Tindr (crater)
- Tinguiririca fauna
- Tinia
- Tinia Valles
- Tinjar Valles
- Tintin (character)
- Tintin on the Moon
- Tintin: Destination Adventure
- Tintina (rock)
- Tintina Fault
- Tintoretto (crater)
- Tiny Ionospheric Photometer
- Tiny Planets
- Tip of the red-giant branch
- Tip-enhanced Raman spectroscopy
- Tippy D'Auria
- Tir Planitia
- Tirawa (crater)
- Tired light
- Tired mountain syndrome
- Tirhuta Panchang
- Tirunageswaram Naganathar Temple
- Tiselius
- Tisserand (crater)
- Tisserand's criterion
- Tisserand's parameter
- Tissint meteorite
- Tissot's indicatrix
- Tissue residue
- Titan (Baxter novel)
- Titan (Bova novel)
- Titan (Marvel Comics location)
- Titan (Varley novel)
- Titan (moon)
- Titan (rocket family)
- Titan (supercomputer)
- Titan 23G
- Titan 34D
- Titan A.E.
- Titan Empire
- Titan II GLV
- Titan IIIA
- Titan IIIB
- Titan IIIC
- Titan IIID
- Titan IIIE
- Titan IIIM
- Titan IV
- Titan Lake In-situ Sampling Propelled Explorer
- Titan Mare Explorer
- Titan Maximum
- Titan Saturn System Mission
- Titan Winged Aerobot
- Titan in fiction
- Titan2d-mod
- Titanfall (video game)
- Titanfall 2
- Titania (DC Comics)
- Titania (moon)
- Titanium in zircon geothermometry
- Titanomagnetite
- Tithi
- Tithonium Chasma
- Titian (crater)
- Titius (crater)
- Titius–Bode law
- Title 51 of the United States Code
- Titov (crater)
- Titov Main Test and Space Systems Control Centre
- Tittsworth
- Tiu Valles
- TiungSAT-1
- Tiwanaku
- Tiwaz (Luwian deity)
- Tiwaz (rune)
- Tiësto
- Tlacotepec meteorite
- Tlāhuizcalpantecuhtli
- Tlālchitōnatiuh
- To Mars and Providence
- To Ngoc Van (crater)
- To Our Children's Children's Children
- To Serve Man
- To Sleep in a Sea of Stars
- To Venus in Five Seconds
- To the Earth
- To the Moon and Back (Savage Garden song)
- To the Stars: Costa Rica in NASA
- Toad in the hole (game)
- Toba catastrophe theory
- Tobacco packaging warning messages
- Tobacco smoke
- Tobe Hooper
- Tobi (month)
- Tobias Furneaux
- Tobias Mayer
- Tochi Onyebuchi
- Tod R. Lauer
- Todd B. Hawley
- Todd Howard
- Todd J. Henry
- Todd Lockwood
- Todd Terry
- Toddler bed
- Toffler (Club)
- Together Brothers
- Together Forever (Disney)
- Togian boobook
- Tohil
- Tohil Mons
- Tohu wa-bohu
- Toilet-related injuries and deaths
- Tokamak Energy
- Tokamak Fusion Test Reactor
- Tokamak de Fontenay aux Roses
- Tokamak sawtooth
- Tokapcup-kamuy
- Tokimonsta
- Tokyo Photoelectric Meridian Circle
- Tolansky (crater)
- Toledan Tables
- Tolerable daily intake
- Tolerable weekly intake
- Tolkien (crater)
- Tollmann's bolide hypothesis
- Tolman electronic parameter
- Tolman surface brightness test
- Tolman–Oppenheimer–Volkoff equation
- Tolman–Oppenheimer–Volkoff limit
- Tololo 1247-232
- Tolstoj (crater)
- Tolstoj quadrangle
- Toluca (meteorite)
- Tom Abel
- Tom Boles
- Tom Bolton (astronomer)
- Tom Chantrell
- Tom Cobley Tavern
- Tom Corbett, Space Cadet
- Tom Dame
- Tom DeLonge
- Tom Denniss
- Tom Dinwoodie
- Tom Finn (singer)
- Tom Gehrels
- Tom Goes to the Mayor
- Tom Green
- Tom Grindberg
- Tom Hanks
- Tom Johnson (astronomer)
- Tom Jung
- Tom Mueller
- Tom Murphy (physicist)
- Tom Paris
- Tom Quinn (astrophysicist)
- Tom Reamy
- Tom Reed (bishop)
- Tom Rubnitz
- Tom Shippey
- Tom Smith (engineer)
- Tom Snyder
- Tom Stafford (astronomer)
- Tom Stephan
- Tom Van Flandern
- Tom and Jerry: Blast Off to Mars
- Tom on Mars
- Tom Ölander
- Tom's Bar
- TomTom
- Toma Pishtachev
- Tomb
- Tombaugh (crater)
- Tombaugh Regio
- Tombolo
- Tombs of the Blind Dead
- Tomimaru Okuni
- Tommaso Perelli
- Tommaso Rinuccini
- Tommy Oliver
- Tommy Scott (English musician)
- Tomorrow Is Yesterday
- Tomorrowland
- Tomorrowland (film)
- Tomorrowland Terrace
- Tomorrowland Transit Authority PeopleMover
- Toms Canyon impact crater
- Tomáš Skuhravý
- Tomáš Vorobjov
- Tonalamatl
- Tonantzintla Catalogue
- Tonantzintla Observatory
- Tonga Trench
- Tonghae Satellite Launching Ground
- Tongue & Groove (Atlanta)
- Tonhalle Düsseldorf
- Toni Jerrman
- Toni Weisskopf
- Tonight with Boy Abunda
- Tonk meteorite
- Tony Bullimore
- Tony De Vit
- Tony Hale, Space Detective
- Tony Heinz
- Tony Hewitt
- Tony Humphries (musician)
- Tony Moran
- Tony Orchard
- Tony Spear
- Tony Tough and the Night of Roasted Moths
- Tony Wilson
- Tony Wright (sleep deprivation)
- Too Hot to Handle (1977 film)
- Too Soon to Love
- Tookoonooka crater
- Toomre's stability criterion
- Tooning Out the News
- Toopy and Binoo
- Tooting (crater)
- Toots Shor
- Top Hunter: Roddy & Cathy
- Top Ten Money Making Stars Poll
- TopHat (telescope)
- TopSat
- Topaze (rocket)
- Topcon
- TopoFusion
- Topogon
- Topographic isolation
- Topographic map
- Topographic profile
- Topographic prominence
- Topographic wetness index
- Topography
- Topography of the Moon
- Topolnița Cave
- Topological censorship
- Topological defect
- Topological recursion
- Topological string theory
- Topologically Integrated Geographic Encoding and Referencing
- Topopolis
- Toposcope
- Topostratigraphy
- Topsoil
- Toray Advanced Composites
- Torchship
- Torchwood
- Toreva block
- Torino scale
- Torkel Franzén
- Toro de fuego
- Toroidal reflector
- Toronto Magnetic and Meteorological Observatory
- Toronto Solar Neighbourhoods Initiative
- Torpor Inducing Transfer Habitat For Human Stasis To Mars
- Torquetum
- Torrance Barrens
- Torrazzo of Cremona
- Torre dell'Orologio, Brescia
- Torre dell'Orologio, Mantua
- Torre dell'Orologio, Padua
- Torricelli (crater)
- Torsion-bar antenna
- Torsö (crater)
- Tory Bruno
- Toscanelli (crater)
- Toshiki Tajima
- Toshimasa Furuta
- Toshiro Nomura
- Total Annihilation
- Total Carbon Column Observing Network
- Total Eclipse (1994 video game)
- Total Ozone Mapping Spectrometer
- Total Recall (1990 film)
- Total Recall (2012 film)
- Total carbon
- Total dissolved solids
- Total electron content
- Total known weight
- Total maximum daily load
- Total organic carbon
- Total pressure
- Total suspended solids
- Totally Spies! The Movie
- Touch the Invisible Sky
- Tough (film)
- Toulouse Observatory
- Toulouse Space Centre
- Tour of the Universe
- Tourism on the Moon
- Towed glider air-launch system
- Towelie
- Tower Theatre (Los Angeles)
- Tower of the Winds
- Tower of the Winds (Oxford)
- Tower telescope
- Towers of Darkover
- Townley (crater)
- Townsend (unit)
- Townsend Observatory
- Townsend discharge
- Toxgnostics
- Toxic Zombies
- Toxic alcohol
- Toxic capacity
- Toxic heavy metal
- Toxic unit
- Toxicant
- Toxicity
- Toxicity category rating
- Toxicity characteristic leaching procedure
- Toxicity class
- Toxicodynamics
- Toxicofera
- Toxicogenomics
- Toxicokinetics
- Toxicology
- Toxicology of carbon nanomaterials
- Toxicology of red imported fire ant venom
- Toxicology testing
- Toxicophore
- Toxicovigilance
- Toxidrome
- Toxin
- Toy Story of Terror!
- Toyax
- Toynbee tiles
- Toyota TAA-1
- Tpoint
- TrES-1b
- TrES-2b
- TrES-3b
- TrES-4b
- Traccar
- Trace Gas Orbiter
- Trace element
- Trace gas
- TraceME
- Traces of Catastrophe
- Traces of Death
- Trachyandesite
- Trachybasalt
- Trachyte
- Track 61 (New York City)
- Track Imaging Cherenkov Experiment
- Tracking and Data Relay Satellite System
- Tracking ship
- Tractatus de Purgatorio Sancti Patricii
- Traction (geology)
- Tractor beam
- Tractus Catena
- Tractus Fossae
- Tracy Caldwell Dyson
- Tracy Slatyer
- Tracy Young
- Tracy's Rock
- Trade Wars
- Trader Hornee
- Traditional Chinese timekeeping
- Traffic Department 2192
- Traffic collision avoidance system
- Traffic message channel
- TrafficDito
- Traffik (film)
- Trail ethics
- Trailblazer (satellite)
- Trailing cone
- Training (civil)
- Traitor's Sun
- Traité de mécanique céleste
- Trajectory (fluid mechanics)
- Tralfamadore
- Tralles (crater)
- Trancers
- Tranquility (ISS module)
- Tranquility Base
- Tranquillity Park
- Tranquillityite
- Trans-Atlantic Exoplanet Survey
- Trans-Australian
- Trans-Earth injection
- Trans-Mexican Volcanic Belt
- Trans-Neptunian object
- Trans-Neptunian objects in fiction
- Trans-Planckian problem
- Trans-Siberian Railway
- Trans-lunar injection
- TransHab
- TransOrbital
- Transactions of the Institute of British Geographers
- Transamazonian orogeny
- Transatlantic Climate Bridge
- Transcription translation feedback loop
- Transfer orbit
- Transformers
- Transformers (film)
- Transformers/My Little Pony
- Transformers: Age of Extinction
- Transformers: Cybertron Adventures
- Transformers: Dark of the Moon
- Transformers: Fall of Cybertron
- Transformers: Revenge of the Fallen
- Transformers: The Last Knight
- Transformers: War for Cybertron
- Transformers: War for Cybertron (Nintendo DS)
- Transhuman Space
- Transient astronomical event
- Transient climate simulation
- Transient grating spectroscopy
- Transient lunar phenomenon
- Transit (astronomy)
- Transit (satellite)
- Transit 3B
- Transit 5E-1
- Transit Research and Attitude Control
- Transit instrument
- Transit of Deimos from Mars
- Transit of Earth from Mars
- Transit of Mercury
- Transit of Mercury from Mars
- Transit of Phobos from Mars
- Transit of Venus
- Transit of Venus (album)
- Transit of Venus (opera)
- Transit of Venus (play)
- Transit of Venus March
- Transit of minor planets
- Transit-timing variation
- Transiting Exoplanet Survey Satellite
- Transition zone (Earth)
- Transition-edge sensor
- Translations of Alice's Adventures in Wonderland
- Translations of Through the Looking-Glass
- Transliminality
- Transmission Raman spectroscopy
- Transmission-line pulse
- Transmissometer
- Transmittance
- Transnistria
- Transpiration
- Transpiration cooling
- Transponder (aeronautics)
- Transponder (satellite communications)
- Transport Chemical Aerosol Model
- Transportation Research Part D
- Transporter Industry International
- Transposition, docking, and extraction
- Transvectio equitum
- Transverse aeolian ridges
- Transverse wave
- Transylvania (Nox Arcana album)
- Transylvanian Plateau
- Trap street
- Trapezium Cluster
- Trapped surface
- Trash (Firefly)
- Traumschiff Surprise – Periode 1
- Travel Bug
- Travel to the Earth's center
- Travellers Club
- Travellers Rest, Alpraham
- Travers (crater)
- Traverse (surveying)
- Traverse Gap
- Travis Barman
- Travis Mayweather
- Travis Vengroff
- Travis Walton UFO incident
- Trazodone
- Treasure Planet
- Treasure Planet: Battle at Procyon
- Treatise on Astrology of the Kaiyuan Era
- Treaty of Tordesillas
- Treaty of Zaragoza
- Tree box filter
- Tree of life vision
- Tree throw
- Treehouse of Horror
- Treehouse of Horror VI
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- Treehouse of Horror XVII
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- Treens
- Trek-80
- Trek-80 (1979 video game)
- Trek73
- Tremulous
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- Trent Reznor
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- Trepidation
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- Trevor Noah
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- Treysa (meteorite)
- Trezona Formation
- TriDAR
- Triad (environmental science)
- Triad method
- Trials and Tribble-ations
- Triangulum
- Triangulum Australe
- Triangulum Australe in Chinese astronomy
- Triangulum Galaxy
- Triangulum II
- Triangulum Minus
- Triangulum in Chinese astronomy
- Triatomic molecule
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- Tributary
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- Trick-or-treating
- Trickling filter
- Tricks and Treats (American Horror Story)
- Trident (crater)
- Trident (spacecraft)
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- Triethylaluminium
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- Trihydrogen cation
- Triiodothyronine
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- Trilithon
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- Trimethylborane
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- Trinification
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- Trip with the Teacher
- Triplanetary (novel)
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- Triplicity
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- Trisops
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- Tristan (musician)
- Tristan D
- Tristan Ingram
- Tristimulus colorimeter
- Tritium
- Tritiya
- Triton (moon)
- Triton (novel)
- Triton Hopper
- Tritos
- Trivandrum Observatory
- Troctolite 76535
- Troglofauna
- Troilite
- Trojan (Red Dwarf)
- Trojan (celestial body)
- Trollhunters: Tales of Arcadia
- Tromeo and Juliet
- Tronador (rocket)
- Trophic level index
- Trophic species
- Trophic state index
- Tropic of Cancer
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- Tropical Africa
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- Tropical Cyclone Heat Potential
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- Tropical and subtropical moist broadleaf forests
- Tropical climate
- Tropical cyclone forecast model
- Tropical cyclone forecasting
- Tropical cyclone observation
- Tropical cyclone track forecasting
- Tropical desert
- Tropical ecology
- Tropical geography
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- Tropical nations at the Winter Olympics
- Tropical peat
- Tropical rainforest climate
- Tropical salt pond ecosystem
- Tropical savanna climate
- Tropical year
- Tropicana Club
- Tropics
- Tropopause
- Troposphere
- Tropospheric Emission Spectrometer
- Tropospheric Emissions: Monitoring of Pollution
- Tropospheric ozone
- Tropospheric ozone depletion events
- Trou du Diable
- Trouble Man (film)
- Trouvelot (Martian crater)
- Trouvelot (lunar crater)
- Trover Saves the Universe
- Truck Stop Women
- Truck Turner
- Truckhenge
- True anomaly
- True longitude
- True north
- True owl
- True polar wander on Mars
- Truepera
- Truman Bethurum
- Truman Henry Safford
- Trump administration political interference with science agencies
- Trumpler (Martian crater)
- Trumpler (lunar crater)
- Trumpler 10
- Trumpler 14
- Trumpler 15
- Trumpler 16
- Trumpler 2
- Trumpler 27
- Trumpler 27-1
- Trumpler 3
- Truncated upland
- Trundholm sun chariot
- Trundle bed
- Truth or Dare (2012 film)
- Truttman Sink
- Tryggvadóttir (crater)
- Trylon Cinema
- Tryptophol
- Très Riches Heures du Duc de Berry
- Ts'ai Wen-Chi (crater)
- Ts'ao Chan (crater)
- Tsander (crater)
- Tsegihi
- Tseraskiy (crater)
- Tsikada
- Tsiklon (satellite)
- Tsinger (crater)
- Tsiolkovskiy (crater)
- Tsiolkovsky rocket equation
- Tsiv-Gombori Range
- Tsu Chung-Chi (crater)
- Tsukimi
- Tsukuba Space Center
- Tsukubai
- Tsukuyomi-no-Mikoto
- Tsunami (video game)
- Tsuneo Niijima
- Tsutomu Seki
- Tsvi Piran
- Tswaing crater
- Tsyklon
- Tsyklon-2
- Tsyklon-3
- Tsyklon-4
- Tu Shou'e
- Tubri
- Tubsat-N
- Tuca & Bertie
- Tucana
- Tucana Dwarf
- Tucana in Chinese astronomy
- Tucana-Horologium association
- Tucker (crater)
- Tucson Ring meteorite
- Tucuman pygmy-owl
- Tudor Tavern, Taunton
- Tuff
- Tuff Jam
- Tuff Turf
- Tuffet
- Tuffite
- Tug of war (astronomy)
- Tugaske (crater)
- Tugay
- Tuhua Orogeny
- Tui Regio
- Tuinal
- Tuiren (star)
- Tulin (geology)
- Tulli Papyrus
- Tullio Levi-Civita
- Tullio Regge
- Tully–Fisher relation
- Tulsa Air and Space Museum & Planetarium
- Tulu calendar
- Tulā
- Tumblepop
- Tunable diode laser absorption spectroscopy
- Tundra
- Tundra orbit
- Tung Yüan (crater)
- Tungsten ore
- Tungusic creation myth
- Tunguska event
- Tunka experiment
- Tunnel in the Sky
- Tunnel network
- Tunnel valley
- Tuolumne Intrusive Suite
- Tuorla Observatory
- Tuotilo
- Tupan Patera
- Tupo (crater)
- Tupolev OOS
- Tupolev Tu-2000
- Turbary
- Turbidity
- Turbo: A Power Rangers Movie
- Turbopause
- Turdus Solitarius
- Turf Battles
- Turf Tavern
- Turgis (crater)
- TurkSat-3USat
- Turkish Aerospace Industries
- Turkish Space Agency
- Turkish Space Systems, Integration and Test Center
- Turkish Technic
- Turkish names in space
- Turkmenistan
- Turkmenistan National Space Agency
- Turks in Space
- Turksploitation
- Turms
- Turn Off the Light (album)
- Turn Off the Light, Vol. 1
- Turn-by-turn navigation
- Turner (crater)
- Turnmills
- Turnoff point
- Turok (video game)
- Turtle Beak
- Turtles all the way down
- Tusaş Engine Industries
- Tusi couple
- Tusken Raiders
- Tussock (grass)
- Tutankhamun's meteoric iron dagger
- Tuxedo Mask
- Tvashtar Paterae
- Tvastar
- Tvären
- Twannberg meteorite
- Twentica
- Twenty-Eight Mansions
- Twerps (video game)
- Twilight
- Twilight (Star Trek: Enterprise)
- Twilight Comes Twice
- Twilight Express
- Twilight Shoreliner
- Twilight of the Gods (Bulis novel)
- Twilight phenomena
- Twilo
- Twin Cities Zephyr
- Twin Earth thought experiment
- Twin Earths
- Twin Peaks
- Twin Peaks (season 3)
- Twin Peaks: Fire Walk with Me
- Twin Peaks: The Missing Pieces
- Twin Quasar
- Twin Spica
- Twin Star Rocket
- Twin paradox
- Twin-carbon arc welding
- Twinkle, Twinkle, Little Bat
- Twinkle, Twinkle, Little Star (Pinkney book)
- Twinkling
- Twisted geometries
- Twisted sector
- Twister's Revenge!
- Twistor string theory
- Twistor theory
- Twitches (film)
- Two Bombs, One Satellite
- Two Brewers, Covent Garden
- Two New Sciences
- Two Planets
- Two Suns in the Sunset
- Two Thousand Maniacs!
- Two to Conquer
- Two-Micron Sky Survey
- Two-body problem
- Two-body problem in general relativity
- Two-dimensional correlation analysis
- Two-dimensional electronic spectroscopy
- Two-dimensional gas
- Two-dimensional infrared spectroscopy
- Two-dimensional nuclear magnetic resonance spectroscopy
- Two-dimensional point vortex gas
- Two-line element set
- Two-photon circular dichroism
- Two-photon photoelectron spectroscopy
- Two-stage-to-orbit
- Two-stream approximation
- Two-stream instability
- Twomey effect
- Twyman–Green interferometer
- TyDi
- Tyagaraja (crater)
- Tyazhely Sputnik
- Tyche (hypothetical planet)
- Tycho (lunar crater)
- Tycho Brahe
- Tycho Brahe (Martian crater)
- Tycho Brahe Planetarium
- Tycho Brahe Prize
- Tycho Brahe days
- Tycho G
- Tycho-2 Catalogue
- Tychonic system
- Tycus
- Tyler Nordgren
- Tyndall (Martian crater)
- Tyndall (lunar crater)
- Tynemill
- Type 0 string theory
- Type I string theory
- Type II Cepheid
- Type II string theory
- Type II supernova
- Type Ia supernova
- Type Ib and Ic supernovae
- Type locality (geology)
- Type-cD galaxy
- Typhoon Lee
- Typography (cartography)
- Typometry (printing)
- Tyras Vallis
- Tyrrhena Terra
- Tyrrhenus Mons
- Tyson Medal
- Tytania
- Tyto pollens
- Tyushtya
- Tyvak
- Tzolkinex
- Tzolkʼin
- TÜBİTAK National Observatory
- TÜBİTAK Space Technologies Research Institute
- Télétoon la nuit
- Túpac Katari 1
- TürkmenÄlem 52°E / MonacoSAT
- Türksat (company)
- Türksat 1A
- Türksat 1B
- Türksat 1C
- Türksat 2A
- Türksat 3A
- Türksat 4A
- Türksat 4B
- Türksat 5A
- Türksat 6A
- Tēcciztēcatl
- Tōnalpōhualli
- Tōnatiuh
- U (TNO)
- U Andromedae
- U Antliae
- U Aquarii
- U Aquilae
- U Camelopardalis
- U Carinae
- U Centauri
- U Coronae Borealis
- U Equulei
- U Geminorum
- U Herculis
- U Hydrae
- U Lacertae
- U Microscopii
- U Monocerotis
- U Orionis
- U R Rao Satellite Centre
- U Scorpii
- U Street Music Hall
- U Vulpeculae
- U-HID
- U-duality
- U-shaped valley
- U.K. Schmidt–Caltech Asteroid Survey
- U.S. Johnson Map Project
- U.S. National Geodetic Survey
- U.S. Space & Rocket Center
- U.S. Standard Atmosphere
- U.S. space exploration history on U.S. stamps
- U.S. tracking and data relay satellite
- U1.11
- UAH satellite temperature dataset
- UAPSat-1
- UBAKUSAT
- UBM Aviation
- UBV Photoelectric Photometry Catalogue
- UBV photometric system
- UC1 Freya
- UC2 Kraka
- UC3 Nautilus
- UCISAT-1
- UCast
- UDF 2457
- UDF 423
- UDFj-39546284
- UDFy-38135539
- UESAC
- UFO (1956 film)
- UFO (2018 film)
- UFO (Pink Lady song)
- UFO (TV series)
- UFO Investigators League
- UFO conspiracy theory
- UFO sightings in outer space
- UFO: Afterlight
- UFOetry
- UFOs in fiction
- UGATUSAT
- UGC 12158
- UGC 12591
- UGC 12682
- UGC 2140
- UGC 2885
- UGC 477
- UGC 4879
- UGC 4904
- UGC 5497
- UGC 5692
- UGC 6093
- UGC 6945
- UGC 8335
- UGC 8837
- UGC 9391
- UGC 9405
- UGCA 86
- UGM-27 Polaris
- UGPS J0521+3640
- UGPS J0722−0540
- UH 25
- UH88
- UK Astronomy Technology Centre
- UK Climate Assembly
- UK Dark Matter Collaboration
- UK Dispersion Modelling Bureau
- UK Schmidt Telescope
- UK Space Agency
- UK Space Conference
- UK-DMC
- UK-DMC 2
- UK-DMC 3
- UKIRT Infrared Deep Sky Survey
- ULAS J0015+01
- ULAS J003402.77−005206.7
- ULAS J1120+0641
- ULAS J133553.45+113005.2
- ULAS J1342+0928
- ULTRASAT
- UMIST linear system
- UN-SPIDER
- UNAVCO
- UNIFORM-1
- UNITE (satellite)
- UNOSAT
- UNOSAT (satellite)
- UNSW School of Surveying and Geospatial Engineering
- UP Aerospace
- UPSat
- UR-100
- UR-100N
- UR-200
- URAN
- US 708
- US Fleet Tracking
- US Orbital Segment
- US-A
- US-K
- US-KMO
- US-KS
- USA Up All Night
- USA-1 (satellite)
- USA-10
- USA-100
- USA-117
- USA-126
- USA-128
- USA-130
- USA-132
- USA-135
- USA-145
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- USA-165
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- USA-190
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- USA-35
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- USA-49
- USA-5
- USA-50
- USA-54
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- USC Wrigley Institute for Environmental Studies
- USDA soil taxonomy
- USNO CCD Astrograph Catalog
- USNS Coastal Sentry (T-AGM-15)
- USNS Haiti Victory (T-AK-238)
- USNS Howard O. Lorenzen (T-AGM-25)
- USNS Invincible (T-AGM-24)
- USNS Mission San Fernando
- USNS Observation Island (T-AGM-23)
- USNS Range Recoverer (T-AG-161)
- USNS Range Tracker (T-AGM-1)
- USP (satellite bus)
- USS Brooklyn (1858)
- USS Furse
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- USV RSV (Marine Tech)
- UScoCTIO 108
- UT–Battelle
- UU Aurigae
- UVS (Juno)
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- UWA Telerobot
- UWE-1
- UWE-2
- UX Antliae
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- UX Tauri
- UY Scuti
- UZ Fornacis
- UZ Pyxidis
- Uakitite
- Uber
- Ubik
- Ucayali Peneplain
- Uchinoura Space Center
- Uchu Sentai Kyuranger
- Uco van Wijk
- Udaipur Solar Observatory
- Udic moisture regime
- Udupi Ramachandra Rao
- Udzha
- Ue-Li Pen
- Uecht Observatory
- Ufa-Palast am Zoo
- Ufa-Pavillon am Nollendorfplatz
- Ufo (Club, Berlin)
- UfoCom
- Ufology
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- Uganda
- Ugandan space initiatives
- Uhuru (satellite)
- UiTMSAT-1
- Uintah meridian
- Ukert (crater)
- Ukrainian Optical Facilities for Near-Earth Space Surveillance Network
- Ukrainian Shield
- Ukrainian T-shaped Radio telescope, second modification
- Ukrkosmos
- Ukureyskaya Formation
- Ul (mythology)
- Ular Facula
- Ulf Merbold
- Ulisse Munari
- Ulrich Walter
- Ulrika Babiaková
- Ultima I: The First Age of Darkness
- Ultima II: The Revenge of the Enchantress
- Ultima: Worlds of Adventure 2: Martian Dreams
- Ultimate fate of the universe
- Ultime grida dalla savana
- Ultisol
- Ultra High Frequency Follow-On
- Ultra diffuse galaxy
- Ultra the Multi-Alien
- Ultra-Fast Flash Observatory Pathfinder
- Ultra-cool dwarf
- Ultra-high-energy cosmic ray
- Ultra-high-performance lamp
- Ultra-prominent peak
- Ultra-short period planet
- Ultradian rhythm
- Ultrafast electron diffraction
- Ultrafast laser spectroscopy
- Ultrafast x-ray
- Ultraluminous X-ray source
- Ultraman (comics)
- Ultramarines: A Warhammer 40,000 Movie
- Ultraschall
- Ultraseven
- Ultrasonic grating
- Ultrasound attenuation spectroscopy
- Ultraviolet astronomy
- Ultraviolet index
- Ultraviolet photoelectron spectroscopy
- Ultraviolet/Optical Telescope
- Ultraviolet–visible spectroscopy
- Ultraviolet–visible spectroscopy of stereoisomers
- Ulugh Beg
- Ulugh Beg Observatory
- Ulugh Beigh (crater)
- Ulysses (spacecraft)
- Ulysses Colles
- Ulysses Fossae
- Ulysses Tholus
- Uma Aventura no Tempo
- Umberto Guidoni
- Umbric horizon
- Umbriel (moon)
- Umbrisol
- Umm al Binni lake
- Umov effect
- Umpqua Research Company
- Unafraid of the Dark
- Unambiguous acquisition
- Unao, Balaji
- Unaweep Canyon
- Unbarred spiral galaxy
- Unbirthday
- Uncertainty parameter
- Uncommon Sense
- Uncrewed spacecraft
- Uncrewed spaceflights to the International Space Station
- Under Milk Wood
- Under Milk Wood (1972 film)
- Under Milk Wood (2015 film)
- Under Wraps (film)
- Under the Skin (video game)
- Undercover Brother
- Undercover Brother 2
- Underdog (Kasabian song)
- Underfist: Halloween Bash
- Underground base
- Underground living
- Underwater acoustic positioning system
- Underwater environment
- Undine
- Undisclosed Desires
- Undone (radio series)
- UniBRITE-1
- UniCubeSat-GG
- UniFrac
- UniSat-6
- Unidentified flying object
- Unidentified infrared emission
- Unidentified submerged object
- Unified Model
- Unified S-band
- Unified field theory
- Uniformitarianism
- Unihemispheric slow-wave sleep
- Unimpaired runoff
- Unintended (song)
- Union Observatory
- Unique properties of hyperthermophilic archaea
- Unistellar
- Unit-point atomism
- United Arab Emirates Space Agency
- United Kingdom Chemistry and Aerosols model
- United Kingdom Global Navigation Satellite System
- United Kingdom Infrared Telescope
- United Kingdom Ordnance Survey Zero Meridian
- United Launch Alliance
- United Nations Committee on the Peaceful Uses of Outer Space
- United Nations Office for Outer Space Affairs
- United Nations University Institute for Sustainability and Peace
- United Palace
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- United States Geological Survey
- United States Geological Survey Library
- United States House Committee on Science, Space, and Technology
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- United States Naval Research Laboratory
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- United States Space Command
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- United States of Eurasia
- United States v. Jones
- United States v. Pineda-Moreno
- Unitron
- Unity (ISS module)
- Universal Combat
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- Universal Transverse Mercator coordinate system
- Universal extra dimension
- Universal indicator
- Universal translator
- Universal variable formulation
- Universe
- Universe (1960 film)
- Universe (1976 film)
- Universe (1994 video game)
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- Universe Sandbox
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- Universe: The Definitive Visual Guide
- Universe: The Infinite Frontier
- UniverseMachine
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- University Nanosatellite Program
- University Rover Challenge
- University of Architecture, Civil Engineering and Geodesy
- University of California High-Performance AstroComputing Center
- University of California Observatories
- University of Copenhagen Center for Planetary Research
- University of Maryland Observatory
- University of Michigan Museum of Natural History
- University of New Hampshire Observatory
- University of Oklahoma Observatory
- University of Reading Atmospheric Observatory
- University of Tartu Old Observatory
- University of Tokyo Atacama Observatory
- University of Toronto Southern Observatory
- University of Washington Planetarium
- Unix time
- Unkei (crater)
- Unknown Hinson
- Unknown Song
- Unmanned aerial vehicle
- Uno (Muse song)
- Unobtainium
- Unreal (1998 video game)
- Unreal II: The Awakening
- Unresolved complex mixture
- Unseen Academicals
- Untersberg
- Until the End of Time (book)
- Until the End of the World
- Untitled Spider-Man: Into the Spider-Verse sequel
- Unusual minor planet
- Unveiling a Parallel
- UoSAT-1
- UoSAT-12
- UoSAT-2
- UoSAT-3
- UoSAT-4
- UoSAT-5
- Up the Creek (1984 film)
- Up the Wooden Hills to Bedfordshire
- Upachayasthanas
- Upagraha
- Upconverting nanoparticles
- Uplift Universe
- Uposatha
- Upper Atmosphere Research Panel
- Upper Atmosphere Research Satellite
- Upper airway resistance syndrome
- Upper hybrid oscillation
- Upper mantle (Earth)
- Upper mantle body
- Upper plains unit
- Upper tropospheric cyclonic vortex
- Upper-atmospheric lightning
- Upper-atmospheric models
- Uppermost
- Uppsala Astronomical Observatory
- Uppsala General Catalogue
- Uppsala Southern Schmidt Telescope
- Uppsala–DLR Asteroid Survey
- Uppsala–DLR Trojan Survey
- Uprising (song)
- UpsideDown (DJ)
- Upsilon Andromedae
- Upsilon Andromedae b
- Upsilon Andromedae c
- Upsilon Andromedae d
- Upsilon Andromedae e
- Upsilon Aquarii
- Upsilon Aquilae
- Upsilon Aurigae
- Upsilon Boötis
- Upsilon Cancri
- Upsilon Capricorni
- Upsilon Carinae
- Upsilon Cassiopeiae
- Upsilon Centauri
- Upsilon Ceti
- Upsilon Coronae Borealis
- Upsilon Cygni
- Upsilon Draconis
- Upsilon Eridani
- Upsilon Geminorum
- Upsilon Gruis
- Upsilon Herculis
- Upsilon Hydrae
- Upsilon Leonis
- Upsilon Librae
- Upsilon Lupi
- Upsilon Ophiuchi
- Upsilon Orionis
- Upsilon Pegasi
- Upsilon Piscis Austrini
- Upsilon Piscium
- Upsilon Puppis
- Upsilon Sagittarii
- Upsilon Scorpii
- Upsilon Serpentis
- Upsilon Tauri
- Upsilon Ursae Majoris
- Upsilon Virginis
- Upsilon1 Cancri
- Upsilon1 Cassiopeiae
- Upsilon1 Centauri
- Upsilon1 Eridani
- Upsilon1 Hydrae
- Upsilon2 Cancri
- Upsilon2 Cassiopeiae
- Upsilon2 Centauri
- Upsilon2 Eridani
- Upsilon2 Hydrae
- Upsilon3 Eridani
- Upsilon4 Eridani
- Uptown Saturday Night
- Uptown Theater (Minneapolis)
- Uptown Theatre (Chicago)
- Uptown Theatre (Toronto)
- Upward (military project)
- Upward continuation
- Upwelling
- Uragan-2M
- Ural Mountains
- Urania
- Urania Sternwarte
- Urania – Postępy Astronomii
- Urania's Mirror
- Urania, Vienna
- Uranian (comics)
- Uraniborg
- Uranium mining and the Navajo people
- Uranius Mons
- Uranius Tholus
- Uranius group of volcanoes
- Uranometria
- Uranus
- Uranus (mythology)
- Uranus Pathfinder
- Uranus in fiction
- Uranus trojan
- Urbain Le Verrier
- Urban Geography (journal)
- Urban Guerrilla
- Urban Light
- Urban Terror
- Urban climate
- Urban climatology
- Urban ecosystem
- Urban exploration
- Urban runoff
- Urban stream
- Urbanization and Global Environmental Change Project
- Urca process
- Ureilite
- Urey (crater)
- Urey Medal
- Urey instrument
- Urgenda
- Uriah A. Boyden
- Uriel (Supernatural)
- Uriel's Machine
- Uritorco
- Uroš Seljak
- Ursa (Finland)
- Ursa Major
- Ursa Major Arc
- Ursa Major Cluster
- Ursa Major Dwarf
- Ursa Major Filament
- Ursa Major I Dwarf
- Ursa Major II Dwarf
- Ursa Major Moving Group
- Ursa Major in Chinese astronomy
- Ursa Minor
- Ursa Minor Dwarf
- Ursa Minor in Chinese astronomy
- Ursa Observatory
- Ursids
- Urstrom
- Urstromtal
- Ursula (crater)
- Ursula K. Le Guin
- Ursula Marvin
- Ursus Wehrli
- Urthecast
- Uruguay names in space
- Uruk Sulcus
- Urusei Yatsura 2: Beautiful Dreamer
- Urvara (crater)
- Us and Them (song)
- Usama Hasan
- Use of Weapons
- Useful conversions and formulas for air dispersion modeling
- Ushas
- Ushas Mons
- Usherette tray
- Ushuaïa Ibiza Beach Hotel
- Usil
- Usk Inlier
- Ussuriysk Astrophysical Observatory
- Ustad Isa (crater)
- Ustic
- Ustochrept
- Usuda Deep Space Center
- Usuda Star Dome
- Uta Fritze-von Alvensleben
- Ute meridian
- Utility location
- Utility tunnel
- Utility vault
- Utku Dalmaz
- Utopia Group
- Utopia Planitia
- Utpala (astronomer)
- Utrecht Atlas
- Utsuro-bune
- Uttara Ashadha
- Uttara Bhādrapadā
- Uttara Kalamrita
- Uttarayana
- Utu
- Uvala (landform)
- Uwingu
- Uzbekcosmos
- Uzbekistan
- Uzboi Vallis
- Uzboi-Landon-Morava
- Uzboy
- Uzumaki
- V (1983 miniseries)
- V (1984 TV series)
- V (2009 TV series)
- V (franchise)
- V Antliae
- V Aquilae
- V Centauri
- V Cephei
- V Coronae Australis
- V Coronae Borealis
- V Crucis
- V Hydrae
- V Persei
- V Puppis
- V Sagittae
- V The Final Battle
- V The Second Generation
- V-1 and V-2 Intelligence
- V-1 flying bomb
- V-1 flying bomb facilities
- V-2 No. 13
- V-2 rocket
- V-2 sounding rocket
- V-3 cannon
- V-type asteroid
- V-weapons
- V. G. Bhide
- V. P. Engel'gardt Astronomical Observatory
- V. P. Sandlas
- V.V. Dokuchaev Central Museum of Soil
- V/H/S
- V1017 Sagittarii
- V1054 Ophiuchi
- V1057 Cygni
- V1073 Scorpii
- V1094 Scorpii
- V1191 Cygni
- V1280 Scorpii
- V1291 Aquilae
- V1298 Tauri
- V1309 Scorpii
- V1315 Aquilae
- V1331 Cygni
- V1339 Aquilae
- V1400 Centauri
- V1401 Aquilae
- V1429 Aquilae
- V1472 Aquilae
- V1494 Aquilae
- V1500 Cygni
- V1668 Cygni
- V1974 Cygni
- V2295 Ophiuchi
- V337 Carinae
- V339 Delphini
- V343 Carinae
- V344 Carinae
- V345 Carinae
- V352 Aurigae
- V354 Cephei
- V357 Carinae
- V357 Muscae
- V368 Aquilae
- V372 Carinae
- V373 Cassiopeiae
- V373 Scuti
- V376 Carinae
- V378 Normae
- V380 Orionis
- V381 Cephei
- V382 Carinae
- V382 Velorum
- V385 Andromedae
- V3903 Sagittarii
- V391 Pegasi
- V391 Pegasi b
- V394 Aurigae
- V399 Carinae
- V4024 Sagittarii
- V404 Cygni
- V4046 Sagittarii
- V407 Lupi
- V419 Cephei
- V4199 Sagittarii
- V420 Aurigae
- V424 Lacertae
- V429 Geminorum
- V433 Aurigae
- V4381 Sagittarii
- V445 Puppis
- V446 Herculis
- V448 Carinae
- V450 Aquilae
- V455 Andromedae
- V4641 Sagittarii
- V4650 Sagittarii
- V473 Lyrae
- V4743 Sagittarii
- V476 Cygni
- V4998 Sagittarii
- V500 Aquilae
- V509 Cassiopeiae
- V518 Carinae
- V520 Carinae
- V520 Persei
- V528 Carinae
- V529 Andromedae
- V529 Orionis
- V533 Carinae
- V533 Herculis
- V538 Aurigae
- V538 Carinae
- V539 Arae
- V5668 Sagittarii
- V5856 Sagittarii
- V598 Puppis
- V602 Carinae
- V603 Aquilae
- V604 Aquilae
- V605 Aquilae
- V606 Aquilae
- V630 Sagittarii
- V636 Scorpii
- V691 Coronae Australis
- V705 Cassiopeiae
- V718 Persei
- V725 Sagittarii
- V728 Scorpii
- V744 Centauri
- V752 Centauri
- V763 Centauri
- V774104
- V803 Centauri
- V810 Centauri
- V830 Tauri
- V830 Tauri b
- V831 Centauri
- V838 Herculis
- V838 Monocerotis
- V841 Ophiuchi
- V842 Centauri
- V849 Ophiuchi
- V883 Orionis
- V906 Carinae
- V915 Scorpii
- V923 Aquilae
- V957 Scorpii
- VA spacecraft
- VB 10
- VBK-Raduga
- VENµS
- VERITAS
- VERITAS (spacecraft)
- VF-1 Valkyrie
- VFTS 102
- VFTS 352
- VFTS 682
- VHF Data Link
- VHF omnidirectional range
- VHS 1256-1257
- VIMOS-VLT Deep Survey
- VIPER (rover)
- VIRGOHI21
- VISTA (telescope)
- VLS-1 V03
- VLT Survey Telescope
- VMS Eve
- VNREDSat-1
- VOC contamination of groundwater
- VORTAC
- VRSS-1
- VRSS-2
- VS-15
- VS-30
- VS-40
- VSB-30
- VSOP (planets)
- VSS Enterprise
- VSS Enterprise crash
- VSS Unity
- VSS Unity VF-01
- VSS Unity VP-03
- VSim
- VV Cephei
- VV Corvi
- VV Orionis
- VVV Survey
- VVV-WIT-07
- VW Cephei
- VW Hydri
- VX Sagittarii
- VY Canis Majoris
- VY Pyxidis
- VZ Arietis
- VZ Camelopardalis
- Vaalbara
- Vacuum
- Vacuum Diagrams
- Vacuum Tower Telescope
- Vacuum arc
- Vacuum arc thruster
- Vacuum cementing
- Vacuum evaporation
- Vacuum genesis
- Vacuum solution (general relativity)
- Vacuum to Antimatter-Rocket
- Vacuum-anchor
- Vader (crater)
- Vader Immortal: A Star Wars VR Series
- Vader's Quest
- Vadim Chernobrov
- Vadim Kuzmin (physicist)
- Vadose Zone Journal
- Vadose zone
- Vadym Kaydash
- Vagabond (boat)
- Vagrant Queen
- Vague (club)
- Vaidya metric
- Vaidyanatha Dikshita
- Vaimānika Shāstra
- Vainshtein radius
- Vainu Bappu
- Vainu Bappu Observatory
- Vaisakha
- Vaitheeswaran Koil
- Vakri grahas
- Val Cleaver
- Val Guest
- Valentin Bondarenko
- Valentin Glushko
- Valentin Ivanov (astronomer)
- Valentin Lebedev
- Valentin Naboth
- Valentin Rumyantsev
- Valentin Stansel
- Valentin's Classification of Coastal Contexts
- Valentina Ponomaryova
- Valentina Tereshkova
- Valentino Kanzyani
- Valentinus Otho
- Valera (crater)
- Valeri Kubasov
- Valeri Polyakov
- Valeri Tokarev
- Valerian and the City of a Thousand Planets
- Valeriano Fault System
- Valerie Myerscough
- Valerie Thomas
- Valerie Turner
- Valery Bykovsky
- Valery E. Forbes
- Valery Korzun
- Valery Makrushin
- Valery Rozhdestvensky
- Valery Ryumin
- Valetudo (moon)
- Valhalla (crater)
- Valhalla Cinema, Melbourne
- Valier (crater)
- Valladolid Science Museum
- Valles Marineris
- Valleuse
- Valley
- Valley Centertainment
- Valley network (Mars)
- Valley of Dreams
- Valley of the Dragons (film)
- Vallis (planetary geology)
- Vallis Alpes
- Vallis Baade
- Vallis Bohr
- Vallis Bouvard
- Vallis Inghirami
- Vallis Planck
- Vallis Rheita
- Vallis Schrödinger
- Vallis Snellius
- Valongo Observatory
- Valsalva device
- Valter Axelsson
- Valz Prize
- Vampire Hookers
- Vampires Rock
- Vampires of Geon
- Van Albada (crater)
- Van Allen Probes
- Van Allen radiation belt
- Van Biesbroeck (crater)
- Van Biesbroeck's star catalog
- Van Cittert–Zernike theorem
- Van Eyck (crater)
- Van Gent (crater)
- Van Genuchten–Gupta model
- Van Gogh (crater)
- Van Ikin
- Van Maanen (crater)
- Van Maanen 2
- Van Rhijn (crater)
- Van Serg (crater)
- Van Stockum dust
- Van Veen grab sampler
- Van Vleck (crater)
- Van Wijk (crater)
- Van de Graaff (crater)
- Van den Bergh (crater)
- Van den Bos (crater)
- Van der Waals (crater)
- Van't Hoff (crater)
- Vance Astro
- Vance D. Brand
- Vandenberg Air Force Base
- Vandenberg Launch Emplacement 8
- Vandenberg Launch Facility 10
- Vandenberg Launch Facility 2
- Vandenberg Launch Facility 21
- Vandenberg Launch Facility 3
- Vandenberg Launch Facility 4
- Vandenberg Launch Facility 5
- Vandenberg Launch Facility 6
- Vandenberg Launch Facility 7
- Vandenberg Launch Facility 8
- Vandenberg Launch Facility 9
- Vandenberg Probe Launch Complex C
- Vandenberg Space Launch Complex 2
- Vandenberg Space Launch Complex 8
- Vanderbilt Museum
- Vanderbilt University Observatory
- Vandi Verma
- Vanesa Magar Brunner
- Vanessa (1977 film)
- Vanessa E. Wyche
- Vanguard (rocket)
- Vanguard 1
- Vanguard 2
- Vanguard 3
- Vanguard SLV-1
- Vanguard SLV-2
- Vanguard SLV-3
- Vanguard SLV-5
- Vanguard SLV-6
- Vanguard TV-2
- Vanguard TV-3
- Vanguard TV-3BU
- Vanguard TV-5
- Vanguard TV1
- Vanilla Sky
- Vanishing dimensions theory
- Vanishing island
- Vanishing scalar invariant spacetime
- Vansploitation
- Vanth
- Vanth (moon)
- Vapochromism
- Vapor
- Vapor pressure
- Vapor recovery
- Vapour density
- Var 83
- Varga (astrology)
- Vargeão Dome
- Variable Rate Application
- Variable Specific Impulse Magnetoplasma Rocket
- Variable nebula
- Variable pathlength cell
- Variable star
- Variable star designation
- Variation (astronomy)
- Varignon frame
- Variometer
- Variscale
- Varma (crater)
- Varre-Sai meteorite
- Varsity (pub chain)
- Vartiovuori Observatory
- Vartkess Ara Apkarian
- Varun Sahni
- Varuna
- Varāhamihira
- Vasant Gowarikar
- Vasco da Gama (crater)
- Vashakidze (crater)
- Vasiliev equations
- Vasilij G. Shevchenko
- Vasilis Kanatas
- Vasily Fesenkov
- Vasily Lazarev
- Vasily Leonidovitch Omelianski
- Vasiona
- Vasishtha
- Vasishtha Siddhanta
- Vasya (crater)
- Vatican City
- Vatican Gallery of Maps
- Vatican Observatory
- Vato Gonzalez
- Vaughan–Preston gap
- Vault of the Beast
- Vaupés Arch
- Vautrin Lud Prize
- Vavilov (crater)
- Vayu
- Vazken Andréassian
- Vector Launch
- Vector magnetograph
- Vector measuring current meter
- Vector radiative transfer
- Vedanga Jyotisha
- Vedette (cabaret)
- Vedra Valles
- Veen Observatory
- Veevers crater
- Vega
- Vega (crater)
- Vega (rocket)
- Vega 1
- Vega 2
- Vega Strike
- Vega flight VV01
- Vega flight VV02
- Vega flight VV03
- Vega flight VV04
- Vega flight VV05
- Vega flight VV06
- Vega flight VV07
- Vega flight VV08
- Vega flight VV09
- Vega flight VV10
- Vega flight VV11
- Vega flight VV12
- Vega flight VV13
- Vega flight VV14
- Vega flight VV15
- Vega flight VV16
- Vega flight VV17
- Vega in fiction
- Vega program
- Vegas Vampire
- Vegas in Space
- Vega–Bray Observatory
- Vegetable Man
- Vegetable Production System
- Vegetation Index
- Vegetation and slope stability
- Vegetative treatment system
- Vehicle Assembly Building
- Vehicle location data
- Vehicle tracking system
- Veikko Aleksanteri Heiskanen
- Veil Nebula
- Vein (geology)
- Vejovis
- Vela (constellation)
- Vela (satellite)
- Vela 1A
- Vela 1B
- Vela 2A
- Vela 2B
- Vela 3A
- Vela 3B
- Vela 4A
- Vela 4B
- Vela 5A
- Vela Molecular Ridge
- Vela Pulsar
- Vela Supercluster
- Vela Supernova Remnant
- Vela X-1
- Vela in Chinese astronomy
- Veliky Ustyug (pseudometeorite)
- Velma (mudflat)
- Velma Kelly
- Velocity dispersion
- Velocity interferometer system for any reflector
- Velvet Smooth
- Vendelinus (crater)
- Vendetta Online
- Vendémiaire
- Veneneia
- Venera 1
- Venera 10
- Venera 11
- Venera 12
- Venera 13
- Venera 14
- Venera 15
- Venera 16
- Venera 2
- Venera 2MV-1 No.1
- Venera 2MV-1 No.2
- Venera 2MV-2 No.1
- Venera 3
- Venera 4
- Venera 5
- Venera 6
- Venera 7
- Venera 8
- Venera 9
- Venera Terra
- Venera-D
- Venesat-1
- Venetia Burney
- Venetia Burney Student Dust Counter
- Vening Meinesz (crater)
- Venom (2018 film)
- Venom-induced consumption coagulopathy
- Venom: Let There Be Carnage
- Vensim
- Ventifact
- Ventisquero
- Ventris (crater)
- Ventspils International Radio Astronomy Centre
- Ventura County Air Pollution Control District
- Ventura Theatre
- VentureStar
- Ventôse
- Venus
- Venus (Lady Gaga song)
- Venus (mythology)
- Venus (novel)
- Venus Atmospheric Maneuverable Platform
- Venus Equilateral
- Venus Express
- Venus In Situ Atmospheric and Geochemical Explorer
- Venus In Situ Explorer
- Venus In situ Composition Investigations
- Venus Orbiting Imaging Radar
- Venus Origins Explorer
- Venus Prime
- Venus Spectral Rocket Experiment
- Venus Wars
- Venus and the Seven Sexes
- Venus in Furs (1967 film)
- Venus in culture
- Venus in fiction
- Venus snow
- Venus tablet of Ammisaduqa
- Venusian
- Venusian Lullaby
- Venusians
- Venvaroha
- Vepriai crater
- Vera (song)
- Vera C. Rubin Observatory
- Vera Fedorovna Gaze
- Vera Rubin
- Vera Rubin Early Career Prize
- Verbal language in dreams
- Verd antique
- Verde Vallis
- Verdi (crater)
- Verein für Raumschiffahrt
- Vereinigte Astronomische Gesellschaft
- Verethragna
- Vergilius of Salzburg
- Vergina Sun
- Verification (spaceflight)
- Vermiculated screech owl
- Vermilion Bird
- Vermilion Cliffs National Monument
- Vermillion meteorite
- Vermonica
- Vermont Lunar CubeSat
- Vernacular geography
- Vernadskiy (crater)
- Vernal (Martian crater)
- Vernal pool
- Verneshot
- Vernier spectroscopy
- Vernier thruster
- Vernon R. Morris
- Vernon Royle
- Vernonia Peak Observatory
- Verona Rupes
- Veronica V. Jones
- Versailles Saint-Quentin-en-Yvelines Observatory
- Versatile Toroidal Facility
- Vertical Integration Building
- Vertical Offshore Reference Frames
- Vertical circle
- Vertical deflection
- Vertical ecosystem
- Vertical exaggeration
- Vertical seismic profile
- Vertico spatially modulated illumination
- Vertisol
- Vertregt (crater)
- Very (Martian crater)
- Very (lunar crater)
- Very Large Array
- Very Large Telescope
- Very Long Baseline Array
- Very Small Array
- Very-long-baseline interferometry
- Vesalius (crater)
- Vesica piscis
- Vesna Milosevic-Zdjelar
- Vespasian's Camp
- Vespertilioninae
- Vespertilionoidea
- VesselSat-1
- VesselSat-2
- Vesta (spacecraft)
- Vesta family
- Vestine (crater)
- Vesto Slipher
- Vesuvio Cafe
- Vetchinkin (crater)
- Vetlesen Prize
- Vette (Star Wars)
- Vexx
- Vflo
- Via Campesina
- ViaSat-1
- ViaSat-2
- ViaSat-3
- Viaduct Tavern
- Viasat, Inc.
- Viaspace
- Viatcheslav Mukhanov
- Vibert Douglas
- Vibidia (crater)
- Vibrational Spectroscopy
- Vibrational analysis with scanning probe microscopy
- Vibrational circular dichroism
- Vibrational spectroscopy of linear molecules
- Vibronic coupling
- Vibronic spectroscopy
- Vic Latino
- Vic Viper (video game)
- Vicarious Hypothesis
- Vice Chief of Space Operations
- Vicente Mut Armengol
- Vicente Segrelles
- Vickiana
- Vicky Kalogera
- Victor Anestin
- Victor Calderone
- Victor Drai
- Victor Francis Hess
- Victor J. Glover
- Victor Schumann
- Victor Skumin
- Victor Szebehely
- Victor Warren
- Victor Zagainov
- Victoria (crater)
- Victoria Island structure
- Victoria Kaspi
- Victoria Lidiard
- Victoria Meadows
- Victoria Metcalf
- Victoria Microplate
- Victoria Rupes
- Victoria Theater (New York City)
- Victory (crater)
- Vid Flumina
- Video astronomy
- Video nasty
- Video spectroscopy
- Videometer
- Videopolis (Disneyland Paris)
- Vidojevica
- Vidyo
- Vienna Institute of Demography
- Vienna Observatory
- Vieta (crater)
- Viewfield crater
- Viewliner Train of Tomorrow
- Vijay Kumar Kapahi
- Vijay Kumar Raina
- Vijayanandi
- Vika oxygen generator
- Viking (rocket)
- Viking (satellite)
- Viking 1
- Viking 2
- Viking Terra
- Viking lander biological experiments
- Viking program
- Vikram (1986 Tamil film)
- Vikram Samvat
- Vikram Sarabhai
- Vikram Sarabhai Space Centre
- Viktor Ambartsumian
- Viktor Antonov (art director)
- Viktor Gorbatko
- Viktor Grebennikov
- Viktor Knorre
- Viktor Patsayev
- Viktor Safronov
- Vil'ev (crater)
- Vilcabamba (short story)
- Vilcashuamán
- Villa-Lobos (crater)
- Villafranca Station
- Village of the Giants
- Vilnius University Astronomical Observatory
- Vilnius photometric system
- Vimana (video game)
- Vinasat-1
- Vinasat-2
- Vinbarbital
- Vincent Di Fate
- Vincent Villafranca
- Vincentio Reinieri
- Vincenzo Cerulli
- Vincenzo Maculani
- Vincenzo Miotti
- Vincenzo Natali
- Vincenzo Silvano Casulli
- Vincenzo Viviani
- Vincenzo Zappalà
- Vindhyan Ecology and Natural History Foundation
- Vine–Matthews–Morley hypothesis
- Vinita Marwaha Madill
- Vinod Johri
- Vinod Krishan
- Vinogradov (crater)
- Vinogradsky (crater)
- Vinson's slit-faced bat
- Vinveli Payana Kurippugal
- Vinylbital
- Vin¢ Clarke
- Violence in a Women's Prison
- Violent Midnight
- Violent Shit
- Violeta G. Ivanova
- Violette Cordery
- Viparita Raja yoga
- Viper Dart
- Viper Falcon
- Viper telescope
- Vir Bahadur Singh Planetarium, Gorakhpur
- Viracocha
- Viral metagenomics
- Virbhadra–Ellis lens equation
- Virchow (crater)
- Virgil Finlay
- Virgil L. Sharpton
- Virgil W. Vogel
- Virgilio Trettenero
- Virgin Atlantic GlobalFlyer
- Virgin Galactic
- Virgin Orbit
- Virgin Witch
- Virginia Air and Space Center
- Virginia Commercial Space Flight Authority
- Virginia Kidd
- Virginia Living Museum
- Virginia Louise Trimble
- Virginia Pumpkin Festival
- Virginids
- Virginio Cesarini
- Virgo (astrology)
- Virgo (constellation)
- Virgo Cluster
- Virgo Consortium
- Virgo I
- Virgo Stellar Stream
- Virgo Supercluster
- Virgo in Chinese astronomy
- Virgo interferometer
- Virgocentric flow
- Virial mass
- Virpi Niemelä
- Virrat (crater)
- Virtanen (crater)
- Virtual Observatory India
- Virtual Planetary Laboratory
- Virtual Reference Station
- Virtual black hole
- Virtual fixture
- Virtual geographic environments
- Virtual observatory
- Virtuality (film)
- Virtually imaged phased array
- Virtually safe dose
- Virtuoso (video game)
- Vis-viva equation
- Visconte Maggiolo
- Vishniac (crater)
- Vishnu
- Vishnu Vasudev Narlikar
- Vishuddha Siddhanta Panjika
- Vishākhā
- Visible Infrared Imaging Radiometer Suite
- Visible Multi Object Spectrograph
- Visible-light astronomy
- Visio Godeschalci
- Visio Karoli Grossi
- Visio Karoli Magni
- Visio Tnugdali
- Vision for Space Exploration
- Vision of the Valley of Dry Bones
- VisionMap A3 Digital Mapping System
- Visionaries: Knights of the Magical Light
- Visionary (Star Trek: Deep Space Nine)
- Visioncall
- Visions of Ecstasy
- Visions of the Universe
- Visit to a Small Planet
- Visitors (fictional race)
- Visión Ovni
- Visser (novel)
- Vista Alegre crater
- Vista Theatre (Los Angeles)
- Vista Variables in the Via Lactea
- Visual MODFLOW
- Visual analytics
- Visual binary
- Visual hierarchy
- Visual impairment due to intracranial pressure
- Visual variable
- Visucius
- Vita Hludovici
- Vita Merlini
- Vital Light
- Vitaly Shafranov
- Vitaly Zholobov
- Vitamin D
- Vitello (crater)
- Vitrophyre
- Vitruvius (crater)
- Vittorio Goretti
- Vitya (crater)
- Viva Mars Vegas
- Vivaldi (crater)
- Vivian Della Chiesa
- Vivian Pellizari
- Viviani (crater)
- Vivos (underground shelter)
- Vixen (telescopes)
- Vixen (video game)
- Vizada
- VizieR
- Višnjan Observatory
- Vlacq (crater)
- Vladimir Aksyonov
- Vladimir Albitsky
- Vladimir Barmin
- Vladimir Belinski
- Vladimir Chelomey
- Vladimir Dezhurov
- Vladimir Dzhanibekov
- Vladimir Georgiyevich Titov
- Vladimir Gruzdev
- Vladimir Iosifovich Petviashvili
- Vladimir Karapetoff
- Vladimir Komarov
- Vladimir Kovalyonok
- Vladimir Lyakhov
- Vladimir Lysenko
- Vladimir M. Lipunov
- Vladimir Pletser
- Vladimir Shatalov
- Vladimir Shkodrov
- Vladimir Varićak
- Vladimir Vasyutin
- Vladimír Porubčan
- Vladimír Remek
- Vladislav Volkov
- Vlasov equation
- Vogel (Martian crater)
- Vogel (lunar crater)
- Vogon
- Vogt–Russell theorem
- Vogue (dance)
- Void (astronomy)
- Void galaxy
- Void ratio
- Voigt effect
- Voigt profile
- Vojislav Mišković
- Volans
- Volans in Chinese astronomy
- Volatiles
- Volatility (chemistry)
- Volcanic ash
- Volcanic ash aggregation
- Volcanic block
- Volcanic bomb
- Volcanic gas
- Volcanic glass
- Volcanic hazards
- Volcanic impacts on the oceans
- Volcanic lightning
- Volcanic rock
- Volcanic sublimate
- Volcanic winter
- Volcaniclastics
- Volcanism on Io
- Volcanism on Mars
- Volcanism on Venus
- Volcano
- Volcano Ranch experiment
- Volcano-sedimentary sequence
- Volcanology
- Volendam New Year's fire
- Volga (rocket stage)
- Volgo–Uralia
- Volkov (crater)
- Volta (crater)
- Voltage-regulator tube
- Voltaire (crater)
- Volterra (crater)
- Volume (thermodynamics)
- Volume cartography
- Volumetric video
- Voluntary Human Extinction Movement
- Volunteer Hotel
- Volvelle
- Von Baeyer (crater)
- Von Behring (crater)
- Von Braun (crater)
- Von Braun Astronomical Society
- Von Braun Ferry Rocket
- Von Békésy (crater)
- Von Kármán (Martian crater)
- Von Kármán (lunar crater)
- Von Neumann (crater)
- Von Zeipel (crater)
- Von Zeipel theorem
- Von der Pahlen (crater)
- Vonnegut (crater)
- Voodoo Planet
- Vorkosigan Saga
- Voronezh Mechanical Plant
- Voronezh radar
- Vorontsov-Vel'yaminov Interacting Galaxies
- Vorpal sword
- Vortex Garden
- Vortex coronagraph
- Vortex sheet
- Vortigaunt
- Vortigern
- Vorton
- Voskhod (rocket)
- Voskhod (spacecraft)
- Voskhod 1
- Voskhod 2
- Voskhod Spacecraft "Globus" IMP navigation instrument
- Voskhod programme
- Voskresenskiy (crater)
- Vostochny Cosmodrome
- Vostok (crater)
- Vostok (rocket family)
- Vostok (spacecraft)
- Vostok 1
- Vostok 2
- Vostok 3 and 4
- Vostok 5
- Vostok 6
- Vostok programme
- Vostok-K
- Vostok-L
- Voulismeno Aloni
- Vow of Justice
- Voyage (novel)
- Voyage from Yesteryear
- Voyage to the End of the Universe
- Voyage to the Planet of Prehistoric Women
- Voyage to the Prehistoric Planet
- Voyage: Inspired by Jules Verne
- Voyager (video game)
- Voyager 1
- Voyager 2
- Voyager Golden Record
- Voyager I (video game)
- Voyager Terra
- Voyager program
- Voyager program (Mars)
- Voyagers (film)
- Voyages of Imagination
- Vredefort crater
- Vrykolakas
- Vucub-Came Macula
- Vug
- Vulcain (rocket engine)
- Vulcan (hypothetical planet)
- Vulcan Planum
- Vulcan laser
- Vulcanisaeta
- Vulcanoid
- Vulnerable waters
- Vulpecula
- Vulpecula OB1
- Vulpecula in Chinese astronomy
- Vuver (crater)
- VxInsight
- Vyacheslav Krasko
- Vyacheslav Zudov
- Vyommitra
- Vytautas Straižys
- Vyāsa (crater)
- Várzea forest
- Väinämöinen
- Väinö Auer
- Väisälä (crater)
- Véronique (rocket)
- Véronique Buat
- Véronique Dehant
- Víctor A. Carreño
- Víctor M. Blanco Telescope
- Vít Kárník
- Völuspá
- Vālmiki (crater)
- Vṛścika
- Vṛṣabha
- W Andromedae
- W Aquilae
- W Canis Majoris
- W Carinae
- W Centauri
- W Cephei
- W Coronae Borealis
- W Corvi
- W Crucis
- W Cygni
- W Hydrae
- W Mensae
- W Orionis
- W Sagittarii
- W Serpentis
- W Ursae Majoris
- W Ursae Majoris variable
- W Ursae Minoris
- W Virginis
- W Virginis variable
- W series (satellites)
- W. A. Gayle Planetarium
- W. Albert Hiltner
- W. Bond (crater)
- W. Christopher Winter
- W. David Arnett
- W. G. Unruh
- W. Kamau Bell
- W. M. Keck Observatory
- W. Raymond Drake
- W. W. Hutchison Medal
- W. Watson and Son
- W.O.R.F. (Write Once Read Forever)
- W2150AB
- W33A
- W3C Geolocation API
- W43A
- W47
- W49B
- W50 (nebula)
- W70
- W71
- W75N(B)-VLA2
- WAC Corporal
- WALL-E
- WARR (TUM)
- WARR (research group)
- WASP-1
- WASP-10
- WASP-104b
- WASP-107b
- WASP-10b
- WASP-11/HAT-P-10
- WASP-11b/HAT-P-10b
- WASP-12
- WASP-121
- WASP-121b
- WASP-12b
- WASP-13
- WASP-14
- WASP-14b
- WASP-15
- WASP-15b
- WASP-16
- WASP-16b
- WASP-17
- WASP-17b
- WASP-18
- WASP-189 b
- WASP-18b
- WASP-19
- WASP-19b
- WASP-1b
- WASP-2
- WASP-21
- WASP-22b
- WASP-24
- WASP-24b
- WASP-25
- WASP-26
- WASP-28b
- WASP-29
- WASP-2b
- WASP-3
- WASP-31b
- WASP-32
- WASP-33b
- WASP-34
- WASP-35
- WASP-36
- WASP-37
- WASP-39b
- WASP-3b
- WASP-4
- WASP-43
- WASP-43b
- WASP-44
- WASP-44b
- WASP-45
- WASP-46
- WASP-47
- WASP-48
- WASP-48b
- WASP-49
- WASP-4b
- WASP-5
- WASP-50
- WASP-52
- WASP-54
- WASP-55
- WASP-56
- WASP-57
- WASP-58
- WASP-59
- WASP-5b
- WASP-6
- WASP-60
- WASP-61
- WASP-62
- WASP-64
- WASP-66
- WASP-67
- WASP-6b
- WASP-7
- WASP-72
- WASP-76
- WASP-76b
- WASP-78
- WASP-79b
- WASP-7b
- WASP-8
- WASP-85 Ab
- WASP-8b
- WASP-95
- WAVAR
- WAsP
- WD 0137−349
- WD 0145+234
- WD 0346+246
- WD 0806−661
- WD 1145+017
- WD 1145+017 b
- WD 1337+705
- WD 1856+534
- WD 2359−434
- WD J0651+2844
- WD J0914+1914
- WD J1953−1019
- WD J2356−209
- WEA Film Study Group
- WEAP
- WEPP
- WIMP Argon Programme
- WINDS
- WISDOM (radar)
- WISDOM Project
- WISE 0146+4234
- WISE 0350−5658
- WISE 0359−5401
- WISE 0458+6434
- WISE 0535−7500
- WISE 0607+2429
- WISE 0647−6232
- WISE 0713−2917
- WISE 0734−7157
- WISE 0855−0714
- WISE 1217+1626
- WISE 1405+5534
- WISE 1506+7027
- WISE 1541−2250
- WISE 1639−6847
- WISE 1800+0134
- WISE 1828+2650
- WISE 2220−3628
- WISE J0005+3737
- WISE J004945.61+215120.0
- WISE J0254+0223
- WISE J031624.35+430709.1
- WISE J0521+1025
- WISE J080822.18-644357.3
- WISE J1147−2040
- WISE J2000+3629
- WISE J2030+0749
- WISE J2209+2711
- WISE J224607.57−052635.0
- WISEA 1101+5400
- WISEP J190648.47+401106.8
- WISEPA J031325.96+780744.2
- WISEPA J041022.71+150248.5
- WISEPA J173835.53+273258.9
- WISEPA J174124.26+255319.5
- WISEPA J184124.74+700038.0
- WISEPA J195246.66+724000.8
- WISEPC J205628.90+145953.3
- WISPR
- WIYN Consortium
- WIYN Observatory
- WMS (hydrology software)
- WOH G17
- WOH G64
- WOH S279
- WOH S281
- WR 1
- WR 102
- WR 102c
- WR 102ea
- WR 102ka
- WR 104
- WR 111
- WR 114
- WR 12
- WR 124
- WR 134
- WR 135
- WR 136
- WR 137
- WR 140
- WR 142
- WR 147
- WR 148
- WR 156
- WR 2
- WR 20a
- WR 21a
- WR 22
- WR 24
- WR 25
- WR 3
- WR 30a
- WR 31a
- WR 42e
- WR 46
- WR 7
- WR 86
- WR 9
- WR 93b
- WRESAT
- WT1190F
- WW Aurigae
- WX Coronae Australis
- WX Pyxidis
- WZ Andromedae
- WZ Cassiopeiae
- WZ Cephei
- WZ Sagittae
- Wabana Group
- Wabar craters
- Waconda Spring
- Wadd
- Wade Hurt
- Wadia Institute of Himalayan Geology
- Wadsleyite
- Wafra (crater)
- Wagner (crater)
- Wahlquist fluid
- Wahoo (crater)
- Waitin' for a Superman
- Waiting for God (Red Dwarf)
- Waiting for the Worms
- Wake (McMann novel)
- Wake Shield Facility
- Wake therapy
- WakeMate
- Waking Life
- Waking Mars
- Waking up early
- Wala (goddess)
- Walcher of Malvern
- Waleed Abdalati
- Walidah Imarisha
- Walk of Fame of Cabaret
- Walk the Angry Beach
- Walk the Walk
- Walkabout (pub chain)
- Walker (crater)
- Wall (Chinese constellation)
- Wall to Wall (song)
- Wall-crossing
- WallaMe
- Wallace (Martian crater)
- Wallace (lunar crater)
- Wallace Hampton Tucker
- Wallace John Eckert
- Wallace L. W. Sargent
- Wallace Line
- Wallace Smith Broecker
- Wallace's scops owl
- Wallacea
- Wallach (crater)
- Wallachian Plain
- Walloon platform for the IPCC
- Wallops Flight Facility
- Wally Funk
- Wally Schirra
- Wally Wallington
- Wally Wingert
- Wally Wood
- Walt Cassidy (artist)
- Walt Disney's Carousel of Progress
- Walter Augustin Villiger
- Walter Baade
- Walter Baele
- Walter Brit
- Walter C. Pitman III
- Walter C. Williams
- Walter Clopton Wingfield
- Walter Cronkite
- Walter Cunningham
- Walter Dornberger
- Walter F. Huebner
- Walter Ferreri
- Walter Frederick Gale
- Walter Goodacre
- Walter Gordy
- Walter Grotrian
- Walter H. Breen
- Walter H. F. Smith
- Walter H. Haas
- Walter Haeussermann
- Walter Hunziker
- Walter Jacobi
- Walter Kubilius
- Walter Lewin
- Walter McAfee
- Walter Mondale
- Walter Orr Roberts
- Walter R. Cooney Jr.
- Walter Reade
- Walter Riedel
- Walter Scott Houston
- Walter Siegmeister
- Walter Smiles
- Walter Stibbs
- Walter Sydney Adams
- Walter Thiel
- Walter Topping
- Walter W. Thomas
- Walter Wislicenus
- Walther (crater)
- Waltraut Seitter
- Wamphyri
- Wan-Hoo (crater)
- Wanda (crater)
- Wanda Quilhot
- Wanda Sykes
- Wander Over Yonder
- Wandlebury Hill
- Wang Huanyu
- Wang Sichao
- Wang Yaping
- Wang Yongzhi
- Wapowski (crater)
- War Dogs (novel)
- War Stories (Firefly)
- War of the Birds
- War of the Planets (1966 film)
- War of the Worlds (1988 TV series)
- War of the Worlds (2005 film)
- War of the Worlds (2019 TV series)
- War of the Worlds: Goliath
- Warcraft
- Warcraft (film)
- Warcraft Adventures: Lord of the Clans
- Warcraft II: Beyond the Dark Portal
- Warcraft II: Tides of Darkness
- Warcraft III: Reforged
- Warcraft III: Reign of Chaos
- Warcraft III: The Frozen Throne
- Warcraft: Orcs & Humans
- Warcraft: The Roleplaying Game
- Ward Observatory
- Ward doubles
- Warehouse (nightclub)
- Warframe
- Wargentin (crater)
- Wargo (crater)
- Warhammer 40,000
- Warhammer 40,000: Darktide
- Warhammer 40,000: Dawn of War
- Warhammer 40,000: Dawn of War II
- Warhammer 40,000: Dawn of War II – Chaos Rising
- Warhammer 40,000: Dawn of War II – Retribution
- Warhammer 40,000: Dawn of War III
- Warhammer 40,000: Dawn of War – Dark Crusade
- Warhammer 40,000: Dawn of War – Soulstorm
- Warhammer 40,000: Dawn of War – Winter Assault
- Warhammer 40,000: Fire Warrior
- Warhammer 40,000: Space Marine
- Warhammer 40,000: Storm of Vengeance
- Warhead (video game)
- Warhol (crater)
- Warida
- Warkworth 30m Radio Telescope
- Warkworth Radio Astronomical Observatory
- Warkworth Radio Telescope
- Warlords of Atlantis
- Warm dark matter
- Warm dense matter
- Warm inflation
- Warmonger (novel)
- Warm–hot intergalactic medium
- Warner & Swasey Company
- Warner (crater)
- Warner Grand Theatre
- Warner Theatre (Erie, Pennsylvania)
- Warner Theatre (Torrington, Connecticut)
- Warner Theatre (Washington, D.C.)
- Warner and Swasey Observatory
- Warning from Space
- Warning sign
- Warp Brothers
- Warp Drive
- Warp drive
- WarpSpeed
- Warped Passages
- Warped geometry
- Warpspace
- Warrego Valles
- Warren B. Offutt
- Warren De la Rue
- Warren Ellis
- Warren Hoburg
- Warren J. North
- Warren Lapine
- Warren Rupp Observatory
- Warren Theatres
- Warrick Couch
- Warriors of Future
- Warriors of Kudlak
- Warsaw Ballroom
- Warsaw meridian
- Warthog (Halo)
- Warwick Goble
- Waseda-SAT2
- Wash load
- Wash margin
- Washboard moraine
- Washing and anointing
- Washington Double Star Catalog
- Washington Large Area Time Coincidence Array
- Washington Shirley, 5th Earl Ferrers
- Washington meridian (Mississippi)
- Washington meridians
- Washington–Chicago Express
- Washland
- Washout (erosion)
- Wasp (novel)
- Wast Hills Observatory
- Waste heat
- Waste pond
- Wastewater
- Wastewater discharge standards in Latin America
- Wastewater quality indicators
- Wastewater treatment
- Watchmen (film)
- Watchmen: Motion Comic
- Water (classical element)
- Water (wuxing)
- Water Communion
- Water Lily Nebula
- Water Research
- Water Resources Research
- Water SA
- Water Science and Technology
- Water and religion
- Water balance
- Water buffalo (zodiac)
- Water column
- Water contact
- Water content
- Water cooling
- Water cycle
- Water distribution on Earth
- Water extraction
- Water garden
- Water hole (radio)
- Water industry
- Water level
- Water of Life (Christianity)
- Water on Mars
- Water on terrestrial planets of the Solar System
- Water pollution
- Water potential
- Water purification
- Water quality
- Water quality modelling
- Water remote sensing
- Water resource policy
- Water resources
- Water retention curve
- Water splitting
- Water stagnation
- Water table
- Water testing
- Water treatment
- Water vapor windows
- Water year
- Water, Air, & Soil Pollution
- Water-meadow
- Waterbed
- Waterbody number
- Watercourse
- Waterfall
- Waterman (crater)
- Waters (crater)
- Waters of Mormon
- Watershed management
- Waterway
- Waterworld
- Watson (crater)
- Watson interferometer
- Watt (crater)
- Watt on Earth
- Watts (crater)
- Watusi (firework)
- Waulsortian mudmound
- Wave pounding
- Wave shoaling
- Wave turbulence
- Wave-cut platform
- Wavefront sensor
- Wavelength-dispersive X-ray spectroscopy
- Waveplate
- Waves (Juno)
- Waves and Instabilities from a Neutral Dynamo
- Waves in plasmas
- Wax Works
- Waxwing (rocket motor)
- Way...Way Out
- Wayback Machine (Peabody's Improbable History)
- Wayfinder
- Wayfinding software
- Wayland Flowers
- Wayne Allyn Root
- Wayne Barlowe
- Wayne Hale
- Wayne Sulo Aho
- Waypoint
- Waze
- We (2018 film)
- We (novel)
- We Can Remember It for You Wholesale
- We Three (novel)
- We choose to go to the Moon
- We'Moon
- We'll Always Have Paris (Star Trek: The Next Generation)
- We-Wish
- Weak gravitational lensing
- Weak gravity conjecture
- Weakly interacting massive particles
- Wearing the Inside Out
- Weather
- Weather Info for All Initiative
- Weather System Follow-on Microwave
- Weather and Forecasting
- Weather and climate
- Weather satellite
- Weather, Climate, and Society
- Weathering
- Weaubleau egg
- Weaubleau structure
- Weaver Student Observatory
- Weaver v. Palmer Bros. Co.
- Web Bot
- Web Processing Service
- Webb (crater)
- Weber (crater)
- Weber bar
- Weber-OSCAR 18
- Weberocereus
- Weberocereus rosei
- Webster's test
- Wedderburn meteorite
- Wedge Antilles
- Wee Winnie Witch's Skinny
- Weekend (1973 TV program)
- Weevac 6
- Wegener (Martian crater)
- Wegener (lunar crater)
- Wei Lijie (scientist)
- Wei Pu
- Wei-Ta Fang
- Weibel instability
- Weierstrass (crater)
- Weigel (crater)
- Weightlessness
- Weimar map
- Weinbaum (crater)
- Weinberg–Witten theorem
- Weinek (crater)
- Weiss (crater)
- Weitkamp Observatory
- Welcome Home Brother Charles
- Welcome to My Nightmare (song)
- Welcome to the Machine
- Welcome to the Space Show
- Welcome to the Universe
- Welding power supply
- Well
- Well (Chinese constellation)
- Well World series
- Well drainage
- Well test
- Wells & Co
- Wells (crater)
- Wells Cathedral clock
- Wells Creek crater
- Wells Tavern, Hampstead
- Welsh Oak
- Welteislehre
- Wen Wang Gua
- Wenceslas Pantaleon Kirwitzer
- Wenchang Spacecraft Launch Site
- Wendy B. Lawrence
- Wendy Freedman
- Wendy Okolo
- Wentworth Erck
- Wenzel Faber
- Werewolves of the Third Reich
- Werewolves on Wheels
- Wergeland (crater)
- Werner (crater)
- Werner Dahm
- Werner Finck
- Werner Gruber
- Werner Kolhörster
- Werner Landgraf
- Wernher von Braun
- Wesley Crusher
- Wesley Huntress
- Wessobrunn Prayer
- Wess–Zumino gauge
- Wess–Zumino model
- West (lunar crater)
- West Andaman Fault
- West Edmonton Mall
- West Hawk Lake
- West Hawk crater
- West Mountain Observatory
- West Peruvian screech owl
- West Siberian Glacial Lake
- West Siberian Plain
- West Texas Express
- West Virginia Night Express
- West Woods
- WestBam
- Westar
- Westar 1
- Westbrook Nebula
- Westerbork Synthesis Radio Telescope
- Westerhout 31
- Westerhout 40
- Westerhout 43
- Westerhout 49
- Westerhout 5
- Westerlund 1
- Westerlund 1-20
- Westerlund 1-237
- Westerlund 1-26
- Westerlund 1-75
- Westerlund 2
- Westerlund telescope
- Western Australian Government Astronomer
- Western Ethiopian Shield
- Western Ghats
- Western Ghats Ecology Expert Panel
- Western Hemisphere
- Western Himalaya
- Western Indo-Pacific
- Western Mail (train)
- Western Palaearctic
- Western Regional Climate Center
- Western astrology
- Western bent-winged bat
- Western chorus frog
- Western sucker-footed bat
- Westfield Mall of Scandinavia
- Westmorland Geological Society
- Weston meteorite
- Wet meadow
- Wet oxidation
- Wet workshop
- Wetherspoons
- Wetland
- Wetland classification
- Wetland indicator status
- Wetland methane emissions
- Wetlands Preserve
- Wetted perimeter
- Wetumpka crater
- Wetworld
- Wexler (crater)
- Weyl (crater)
- Weyl curvature hypothesis
- Weyl metrics
- Weyl scalar
- Weyl's postulate
- Weyl–Lewis–Papapetrou coordinates
- Weywot (moon)
- Whakatane Astronomical Society
- Whalers Way Orbital Launch Complex
- Whangarei Observatory
- Whartonia carpenteri
- What Do You Want from Me (Pink Floyd song)
- What Fun We Were Having: 4 Stories About Date Rape
- What If the Moon Didn't Exist
- What Is It Like to Be a Bat?
- What Mad Universe
- What Price Innocence?
- What Shall We Do Now?
- What on Earth! (film)
- What's Going On up There?
- What's Up Nurse!
- What's Up Superdoc!
- Wheatley (crater)
- Whedonesque.com
- Whedonverse (comics)
- Wheeler J. North
- Wheeler–DeWitt equation
- Wheels Stop
- Wheely
- When Aliens Attack
- When Black Birds Fly
- When Dreams Turn to Dust
- When Good Ghouls Go Bad
- When I Dream (song)
- When I Dream of Michelangelo
- When It's Sleepy Time Down South
- When Knowledge Conquered Fear
- When We First Met
- When We Left Earth: The NASA Missions
- When Worlds Collide
- When Worlds Collide (1951 film)
- When the Tigers Broke Free
- Where Did All the Love Go?
- Where Is Everybody?
- Where in Space Is Carmen Sandiego?
- Where the Buggalo Roam
- Where the Dead Go to Die
- Where's My Cow?
- Whewell (crater)
- While You Were Sleeping (2017 TV series)
- While the Earth Sleeps
- Whindust
- Whinstone
- Whipple (crater)
- Whipple (spacecraft)
- Whipple Award
- Whipple shield
- Whirl-Y-Gig
- Whirlpool Galaxy
- Whirlwind (comics)
- Whiro
- Whistler (radio)
- White & Nerdy
- White (crater)
- White Base
- White Bay Hotel
- White Christmas (song)
- White Collar-1
- White Cross, Richmond
- White Dwarf (film)
- White Hart, Grays
- White Hole (Red Dwarf)
- White House Astronomy Night
- White House at Night
- White Lion Inn, Stratford-upon-Avon
- White Lion, Barthomley
- White Lion, Covent Garden
- White Night festivals
- White Panda
- White Sands Space Harbor
- White Sands Test Facility
- White Sea Rift System
- White Tiger (mythology)
- White box system
- White dwarf
- White fuming nitric acid
- White gods
- White hole
- White light interferometry
- White light scanner
- White noise machine
- White pipe clay
- White-eye (soil)
- White-fronted scops owl
- White-nose syndrome
- White-throated screech owl
- Whitebox Geospatial Analysis Tools
- Whitecourt crater
- Whitedamp
- Whitehead's theory of gravitation
- Whitehurst & Son sundial
- Whitey on the Moon
- White–Juday warp-field interferometer
- Whiting event
- Whitley Strieber
- Whizziwig
- Who Knows Who
- Who Watches the Watchers
- Who's Afraid of Wolf 359?
- Who's Gonna Win the War?
- Who's Your Caddy?
- Whole Earth Blazar Telescope
- Whoopi Goldberg
- Why Does the World Exist?
- Why We Nap
- Why We Sleep
- Why there is anything at all
- Wi (mythology)
- Wichmann (crater)
- Wide Angle Search for Planets
- Wide Area Augmentation System
- Wide Area GPS Enhancement
- Wide Field Infrared Explorer
- Wide Field and Planetary Camera
- Wide Field and Planetary Camera 2
- Wide-angle X-ray scattering
- Wide-field Infrared Survey Explorer
- Wideband Global SATCOM
- Widener University Observatory
- Widget (TV series)
- Widget (video game)
- Widmannstätten (crater)
- Widmanstätten pattern
- Wiechert (crater)
- Wiener (crater)
- Wieringerrandmeer
- Wiesław Z. Wiśniewski
- WiggleZ Dark Energy Survey
- Wigner fusion
- Wigpool Ironstone Mine
- Wiki-Solar
- Wikiloc
- Wikimapia
- Wil Wheaton
- Wilber Brotherton Huston
- Wilbur Norman Christiansen
- Wild Arms
- Wild Arms: Twilight Venom
- Wild Duck Cluster
- Wild Guns
- Wild Hogs
- Wild Honey Inn
- Wild Rebels
- Wild Strawberries (film)
- Wild animal suffering
- Wild in the Streets
- Wild's Triplet
- WildStar (video game)
- Wilde Sau
- Wildest Dreams (Brandy song)
- Wildfire modeling
- Wildlife Acoustics
- Wildlife corridor
- Wildlife management
- Wildlife observation
- Wildness
- Wildt (crater)
- Wilfred Brown, Baron Brown
- Wilfrid Leng
- Wilfried Struve
- Wilhelm (crater)
- Wilhelm Beer
- Wilhelm F. Rabe
- Wilhelm Gliese
- Wilhelm Gotthelf Lohrmann
- Wilhelm Julius Foerster
- Wilhelm Klinkerfues
- Wilhelm Reich
- Wilhelm Schickard
- Wilhelm Schur
- Wilhelm Sievers
- Wilhelm Simon
- Wilhelm Tempel
- Wilhelm von Biela
- Wilhelmina Iwanowska
- Wilhelmine Witte
- Wilkes Land crater
- Wilkins (crater)
- Wilkinson Microwave Anisotropy Probe
- Will Hay
- Will Munro
- Will Pomerantz
- Will Saul
- Will Whitehorn
- Will the Real Martian Please Stand Up?
- Will-o'-the-wisp
- Willamette Meteorite
- Willamette Stone
- Willapa Hills
- Willard Harrison Bennett
- Willard L. Eccles Observatory
- Willebrord Snellius
- Willem Frederik Hermans
- Willem Hendrik van den Bos
- Willem Jacob Luyten
- Willem Jacob van Stockum
- Willem Schouten
- Willem de Sitter
- Willet G. Miller Medal
- Willi Ninja
- Willi Pape
- William A. Bradfield
- William A. Pailes
- William Alfred Fowler
- William Allen Miller
- William Andrews (astrologer)
- William B. Lenoir
- William Blair-Bell
- William Bowie Medal
- William Boyd Dawkins
- William Brydone Jack Observatory
- William C. Dement
- William C. McCool
- William C. Schneider
- William Cameron Menzies
- William Carpentier
- William Chawner
- William Christian Krumbein Medal
- William Christie (astronomer)
- William Clarke (apothecary)
- William Coblentz
- William Cranch Bond
- William Cunnington
- William Dampier
- William Devonshire Saull
- William Dixon West
- William Duncan MacMillan
- William E. Brunk
- William E. Gordon
- William E. Moerner
- William E. Thornton
- William Edmund Harper
- William Edward Trent
- William Ellis (astronomer)
- William Ernest Cooke
- William Eubank
- William F. Bottke
- William F. Meggers Award in Spectroscopy
- William F. Readdy
- William F. Sturgis
- William Fishburn Donkin
- William Foster (British architect)
- William Frederick Denning
- William Frederick Fisher
- William Frederick King
- William G. Gregory
- William G. Tifft
- William Garrow Lettsom
- William Gaskell Medal
- William George Morris
- William Gibson
- William Gilbert Award
- William H. Dana
- William H. Gerstenmaier
- William H. Jefferys
- William H. Matthaeus
- William H. Press
- William H. Robbins
- William H. Twenhofel Medal
- William Hammond Wright
- William Harkness
- William Hawley
- William Henry Finlay
- William Henry Pickering
- William Henry Temple Gairdner
- William Herschel
- William Herschel Telescope
- William Huggins
- William Hussey (astronomer)
- William I. F. David
- William IV, Landgrave of Hesse-Kassel
- William J. Birnes
- William J. Borucki
- William J. Knight
- William J.D. Escher
- William Johnson McDonald
- William Kenneth Hartmann
- William Kingdon Clifford
- William Klemperer
- William Kwong Yu Yeung
- William L. Crawford
- William Lassell
- William Leitch (scientist)
- William Lewis Elkin
- William Liller
- William Lucas (bishop)
- William M. Jackson
- William M. Kaula
- William M. Sinton
- William Markowitz
- William Maw
- William Maxwell Reed
- William Michael Herbert Greaves
- William Miller Sperry Observatory
- William Moses Feldman
- William Napier (astronomer)
- William Oefelein
- William Otto Brunner
- William P. Bidelman
- William Parsons, 3rd Earl of Rosse
- William Pinch
- William Pogue
- William R. Lucas
- William R. Muehlberger
- William R. Stoeger
- William Radcliffe Birt
- William Randolph Lovelace II
- William Richardson (astronomer)
- William Richardson (bishop)
- William Robert Brooks
- William Rolleston
- William Rotsler
- William Rowan Hamilton
- William S. Burroughs
- William S. McArthur
- William Sadler Franks
- William Scott (astronomer and priest)
- William Selwyn (astronomer)
- William Shepherd
- William Simms (instrument maker)
- William Smith Medal
- William Stanley (inventor)
- William Stanley Sykes
- William Stephen Finsen
- William Stephen Jacob
- William Stukeley
- William Swan (physicist)
- William Tenn
- William Thomas Braithwaite
- William Thomson (mineralogist)
- William Thornton Bate
- William Townshend (cricketer)
- William Tyler Olcott
- William W. Parsons (NASA)
- William Wales (astronomer)
- William Wallace (mathematician)
- William Wallace Campbell
- William Ward (astronomer)
- William Whitty Hall
- William Wilson Morgan
- William Wingfield (cricketer, born 1834)
- William de Wiveleslie Abney
- William of Conches
- William of Saint-Cloud
- Williamina Fleming
- Williams (Martian crater)
- Williams (lunar crater)
- Williams Observatory
- Williams V-Jet II
- Willibald Peter Prasthofer
- Willie Dynamite
- Willie Soon
- Willis Conover
- Willis Lamb
- Willis Shapley
- Willman 1
- Willow (Chinese constellation)
- Willy Hartner
- Willy Ley
- Wilma Deering
- Wilma Subra
- Wilse B. Webb
- Wilsing (crater)
- Wilson (crater)
- Wilson Cycle
- Wilson effect
- Wilson–Bappu effect
- Wiltshire Museum
- Wiltz (crater)
- Wim Hermsen
- Wimborne Minster astronomical clock
- WinStars
- Winal
- Winchester Science Centre
- Wind (spacecraft)
- Wind Dancer
- Wind Erosion on European Light Soils
- Wind River meridian
- Wind erosion equation
- Wind fetch
- Wind generated current
- Wind of 120 days
- Wind profile power law
- Wind profiler
- Wind wave
- Wind-wave dissipation
- WindSim
- Windermere, South Kenton
- Window (geology)
- Window Observational Research Facility
- Window of opportunity
- Windows on Earth
- Windshield sun shade
- Windsor (soil)
- Windsor Castle, Kensington
- Windsor Great Cave
- Windwatt
- Wine of the Dreamers
- Winer Observatory
- Winfree Observatory
- Wing Commander (film)
- Wing Commander (franchise)
- Wing Commander (video game)
- Wing Commander Academy
- Wing Commander Academy (video game)
- Wing Commander Arena
- Wing Commander II: Vengeance of the Kilrathi
- Wing Commander III: Heart of the Tiger
- Wing Commander IV: The Price of Freedom
- Wing Commander: Armada
- Wing Commander: Privateer
- Wing Commander: Prophecy
- Winged Reusable Sounding rocket
- Winged sun
- Wingless Electromagnetic Air Vehicle
- Wingohocking Creek
- Wings (Chinese constellation)
- Winkler (crater)
- Winlock (crater)
- Winnecke 4
- Winnecke Catalogue of Double Stars
- Winnipeg Limited
- Winnipeger
- Winnipeg–Churchill train
- Winnowing Basket (Chinese constellation)
- Winogradsky column
- Winona meteorite
- Winsley Mines
- Winslow (crater)
- Winslow Upton
- Winston (Overwatch)
- Winston E. Scott
- Winter Dreams (Brandon's Song)
- Winter Gardens (Cleethorpes)
- Winter Hexagon
- Winter Star Party
- Winter Triangle
- Winter solstice
- Winterbourne (stream)
- Wintersmith
- Winthrop (crater)
- Wipeout (video game)
- Wire chamber
- Wirtz (crater)
- Wisconsin H-Alpha Mapper
- Wisdom (film)
- Wise Observatory
- Wish You Were Here (Pink Floyd song)
- Wish fulfillment
- Wishes: A Magical Gathering of Disney Dreams
- Wislicenus (crater)
- Witch's Lament
- Witch's Night Out
- Witchboard
- Witchcraft (1957 song)
- Witches Abroad
- Witching hour
- Witchslayer Gretl
- Witchy Woman
- With the Lightnings
- Without Warning (1994 film)
- Witten index
- Wittenberg interpretation of Copernicus
- Witwatia
- Wizardology: The Book of the Secrets of Merlin
- Wizards of the Demon Sword
- Wizards: Tales of Arcadia
- Wladimir Besnard
- Wojciech Dziembowski
- Wojciech Krzemiński
- Wojciech Siudmak
- Wold Cottage meteorite
- Wolf (crater)
- Wolf 1061
- Wolf 1061b
- Wolf 1061c
- Wolf 1061d
- Wolf 359
- Wolf 359 (The Outer Limits)
- Wolf 359 (podcast)
- Wolf 424
- Wolf 489
- Wolf Bickel
- Wolf O'Donnell
- Wolf V. Vishniac
- Wolf distribution
- Wolf effect
- Wolf in the Fold
- Wolf number
- Wolfbane (novel)
- Wolfe Creek Crater
- Wolfenstein II: The New Colossus
- Wolfenstein: The New Order
- Wolfgang Demtröder
- Wolfgang Kundt
- Wolfgang Leinberer
- Wolfgang Ludwig Krafft
- Wolfgang Ries
- Wolfgang Rindler
- Wolfgang Stahl
- Wolfgang von Wersin
- Wolfman Jack
- Wolfman Mac's Chiller Drive-In
- Wolfram Mathematica
- Wolf–Lundmark–Melotte
- Wolf–Rayet nebula
- Wolf–Rayet star
- Wollaston (crater)
- Wollaston Medal
- Wollaston prism
- Wolstonian Stage
- Wolter telescope
- Woltjer (crater)
- Woltjer's theorem
- Wolverine (NYC train)
- Woman in the Moon
- Womb (nightclub)
- Women In Astronomy Nepal
- Women in Cell Block 7
- Women in NASA
- Women in geology
- Women in prison film
- Women in space
- Women of the Prehistoric Planet
- Women of the World
- Women's Prison Massacre
- Wonder of the Worlds
- Wonderland (event)
- Wonderland (fictional country)
- Wonders of China
- Wonders of the Solar System
- Wonders of the Solar System (book)
- Wonders of the Universe
- Wonders of the Universe (book)
- Wonky hole
- Wood (crater)
- Wood (wuxing)
- Wood Buffalo National Park
- Wood frog
- Wood's slit-faced bat
- Woodchester Mansion
- Woodchester Park SSSI
- Woodes Rogers
- Woodhenge
- Woodleigh crater
- Woodpecker from Mars
- Woodpecker in the Moon
- Woodpeckers from Space
- Woodrow Whitlow Jr.
- Woodruff T. Sullivan III
- Woods Hole Science Aquarium
- Woodsy Owl
- Woodward effect
- Woodward's rules
- Woodwardian Professor of Geology
- Wookiee
- Woolsthorpe Manor
- Woomera Launch Area 5
- Worcester Reed Warner
- World
- World Congress of Soil Science
- World Contact Day
- World Enough and Time (Doctor Who)
- World Fireworks Championship
- World Geodetic System
- World Geographical Scheme for Recording Plant Distributions
- World Glacier Monitoring Service
- World Hydrography Day
- World Is Not Enough (spacecraft propulsion)
- World Meteorological Organization
- World Mill
- World Museum
- World Ocean
- World Ocean Atlas
- World Ocean Circulation Experiment
- World Ocean Database Project
- World Ocean Review
- World Oceans Day
- World Population Conference
- World Population Foundation
- World Port Index
- World Reference Base for Soil Resources
- World Register of Marine Species
- World Sleep Day
- World Soil Museum
- World Space Week
- World View Enterprises
- World War Three (Doctor Who)
- World Wide Views on Global Warming
- World Without Stars
- World crystal
- World egg
- World energy consumption
- World file
- World government in fiction
- World manifold
- World news
- World of A Song of Ice and Fire
- World of Padman
- World of Warcraft
- World of Warcraft Trading Card Game
- World of Warcraft: Battle for Azeroth
- World of Warcraft: Cataclysm
- World of Warcraft: Legion
- World of Warcraft: Mists of Pandaria
- World of Warcraft: Shadowlands
- World of Warcraft: The Burning Crusade
- World of Warcraft: Warlords of Draenor
- World of Warcraft: Wrath of the Lich King
- World to come
- World war
- World wide views
- WorldView-1
- WorldView-2
- WorldView-3
- WorldView-4
- WorldWide Telescope
- Worldchanging (book)
- Worldsheet
- Worldwar series
- Worldwar: In the Balance
- Worldwar: Striking the Balance
- Worldwar: Tilting the Balance
- Worldwar: Upsetting the Balance
- Worldwide Pants
- Worm cast
- Worm's-eye view
- Wormhole
- Wormholes in fiction
- Worms: A Space Oddity
- Wormwood (Bible)
- Worst Case Scenario (Star Trek: Voyager)
- Worst case analysis
- Worst-case analysis
- Wot's... Uh the Deal?
- Wouthuysen–Field coupling
- Wow! signal
- Woytchugga Lacuna
- Wrack zone
- Wray 17-96
- Wreath Nebula
- Wrestlemaniac
- Wright (Martian crater)
- Wright (lunar crater)
- Wright Haskell Langham
- Wrinkle ridge
- Wrinkles in Time
- Wristcutters: A Love Story
- Writers Guild of America Award for Television: Comedy-Variety Talk Series
- Writing in space
- Writing of Principia Mathematica
- Wrong Plane
- Wrong-way driving warning
- Wrongs Darker Than Death or Night
- Wrottesley (crater)
- Wróblewski (crater)
- Wu Jie
- Wu Zhonghua
- Wubbo Ockels
- Wudu
- Wulf Bernard Kunkel
- Wulff-Dieter Heintz
- Wunda (crater)
- Wuppertal Institute for Climate, Environment and Energy
- Wuriupranili
- Wurzelbauer (crater)
- Wuwang Club fire
- Wuxian (Shang dynasty)
- Wuxing (Chinese philosophy)
- Wu–Yang monopole
- Wyld (crater)
- Wyllyotts Manor
- Wyoming Basin physiographic province
- Wyoming Infrared Observatory
- Wyrd Sisters
- Wyst: Alastor 1716
- Wöhler (crater)
- Władysław Dziewulski
- Władysław Turowicz
- Włodzimierz Zonn
- Wǔ Xíng painting
- X (video game series)
- X Band Satellite Communication
- X Caeli
- X Cancri
- X Carinae
- X Centauri
- X Crucis
- X Persei
- X Prize Cup
- X Rebirth
- X Sagittarii
- X Trianguli Australis
- X-10 Graphite Reactor
- X-15 Flight 3-65-97
- X-15 Flight 90
- X-15 Flight 91
- X-41 Common Aero Vehicle
- X-42 Pop-Up Upper Stage
- X-Bomber
- X-Men: The Ravages of Apocalypse
- X-Ray Imaging and Spectroscopy Mission
- X-Ray Spectrometry (journal)
- X-Sat
- X-Wars
- X-factor (astrophysics)
- X-ray Photon Correlation Spectroscopy
- X-ray Polarimeter Satellite
- X-ray Raman scattering
- X-ray absorption fine structure
- X-ray absorption near edge structure
- X-ray absorption spectroscopy
- X-ray astronomy
- X-ray astronomy detector
- X-ray astronomy satellite
- X-ray background
- X-ray binary
- X-ray burster
- X-ray crystallography
- X-ray emission spectroscopy
- X-ray flash (astronomy)
- X-ray fluorescence
- X-ray fluorescence holography
- X-ray interferometer
- X-ray magnetic circular dichroism
- X-ray notation
- X-ray optics
- X-ray photoelectron spectroscopy
- X-ray pulsar
- X-ray pulsar-based navigation
- X-ray reflectivity
- X-ray scattering techniques
- X-ray spectroscopy
- X-ray standing waves
- X-ray telescope
- X-ray transient
- X-shaped radio galaxy
- X-type asteroid
- X. J. Kennedy
- X/1106 C1
- X/1872 X1
- X1 Centauri
- X17 particle
- X2 Centauri
- X2: The Threat
- X3: Albion Prelude
- X3: Reunion
- X3: Terran Conflict
- X4: Foundations
- X: Beyond the Frontier
- X: Night of Vengeance
- XCOR Aerospace
- XCOR EZ-Rocket
- XCOR Lynx
- XENON
- XEUS
- XEphem
- XF5700 Mantis Experimental Fighter
- XL Axiata
- XLR50
- XMASS
- XML Telemetric and Command Exchange
- XMM Cluster Survey
- XMM-Newton
- XMMXCS 2215-1738
- XO Project
- XO Telescope
- XO-1
- XO-1b
- XO-2 (star)
- XO-2Nb
- XO-3
- XO-3b
- XO-4
- XO-4b
- XO-5
- XO-5b
- XO-6b
- XOYO
- XS-1 (spacecraft)
- XSS-10
- XStream Systems
- XTAR
- XTAR-EUR
- XTE J1118+480
- XTE J1550–564
- XTE J1650-500
- XTE J1739-285
- XX Persei
- XX Pyxidis
- XX Tauri
- XX Trianguli
- XXX: Return of Xander Cage
- XXXChange
- XZ Andromedae
- XZ Tauri
- Xallarap
- Xanadu (Titan)
- Xanthe Montes
- Xanthe Terra
- Xatcobeo
- Xavier Barcons
- Xavier Guichard
- Xavier: Renegade Angel
- Xcacau Corona
- Xenoarchaeology
- Xenoblade Chronicles X
- Xenoestrogen
- Xenohormone
- Xenointoxication
- Xenokeryx
- Xenology
- Xenon
- Xenon arc lamp
- Xenophanes (crater)
- Xenophilus
- Xenophon (crater)
- Xenophyophorea
- Xenosaga Episode I
- Xenosaga Episode II
- Xenosaga Episode III
- Xenu
- Xerocole
- Xerophile
- Xerophyte
- Xi Andromedae
- Xi Aquarii
- Xi Aquilae
- Xi Aquilae b
- Xi Arietis
- Xi Aurigae
- Xi Boötis
- Xi Cancri
- Xi Canis Majoris
- Xi Capricorni
- Xi Cassiopeiae
- Xi Centauri
- Xi Cephei
- Xi Ceti
- Xi Columbae
- Xi Coronae Borealis
- Xi Cygni
- Xi Draconis
- Xi Eridani
- Xi Geminorum
- Xi Gruis
- Xi Herculis
- Xi Hydrae
- Xi Leonis
- Xi Lupi
- Xi Mensae
- Xi Ophiuchi
- Xi Orionis
- Xi Pavonis
- Xi Pegasi
- Xi Persei
- Xi Phoenicis
- Xi Piscium
- Xi Puppis
- Xi River virus
- Xi Sagittarii
- Xi Scorpii
- Xi Sculptoris
- Xi Serpentis
- Xi Tauri
- Xi Telescopii
- Xi Ursae Majoris
- Xi Virginis
- Xi Zezong
- Xi1 Canis Majoris
- Xi1 Capricorni
- Xi1 Centauri
- Xi1 Ceti
- Xi1 Lupi
- Xi1 Sagittarii
- Xi2 Canis Majoris
- Xi2 Capricorni
- Xi2 Centauri
- Xi2 Ceti
- Xi2 Lupi
- Xi2 Sagittarii
- Xiangliu (moon)
- Xiao Zhao (crater)
- Xiaohui Fan
- Xiaoliang Sunney Xie
- Xichang Satellite Launch Center
- Xieite
- Xifengite
- Xihe (deity)
- Xinglong Station (NAOC)
- Xinjiang Astronomical Observatory
- Xiuhpōhualli
- Xiuhtecuhtli
- Xolotl
- Xplanet
- Xtro
- Xtro 3: Watch the Skies
- Xtro II: The Second Encounter
- Xuanwu (god)
- Xuntian
- Xylit
- Y Carinae
- Y Centauri
- Y Lyncis
- Y Sagittarii
- Y Sextantis
- Y and Z Holes
- Y-Control for fighters
- Y. P. Varshni
- Y. S. Rao
- YBP 1194
- YF-115
- YF-23 (rocket engine)
- YF-40
- YF-73
- YF-75D
- YGCO Chiyoda Station
- YOLO: Crystal Fantasy
- YZ Canis Minoris
- YZ Cassiopeiae
- YZ Ceti
- Yaana (novel)
- Yablochkina (crater)
- Yablochkov (crater)
- Yablochkov candle
- Yacine Elghorri
- Yagiite
- Yahsat 1A
- Yahya Ibn al-Batriq
- Yahya ibn Abi Mansur
- Yakhta (satellite bus)
- Yakov Protazanov
- Yakov Zeldovich
- Yakovkin (crater)
- Yalchuk
- Yale Observatory Zone Catalog
- Yalode (crater)
- Yalta (nightclub)
- Yama (Hinduism)
- Yamada (crater)
- Yamal (satellite constellation)
- Yamal 101
- Yamal 102
- Yamal 201
- Yamal 202
- Yamal 203
- Yamal 204
- Yamal-300K
- Yamal-401
- Yamal-402
- Yamal-601
- Yamamoto (crater)
- Yamanashi Science Museum
- Yamaneko Group of Comet Observers
- Yamartino method
- Yamato 000593
- Yamato 691
- Yamato 791197
- Yandex.Navigator
- Yang Liwei
- Yanga R. Fernández
- Yangbajain
- Yangel'
- Yangochiroptera
- Yangon Planetarium
- Yangoor (crater)
- Yanjiahe Formation
- Yanyan
- Yao Tandong
- Yaogan
- Yapp telescope
- Yard Dogs Road Show
- Yardang
- Yardangs on Mars
- Yardymly (meteorite)
- Yargo (novel)
- Yarhibol
- Yarikh
- Yarkovsky effect
- Yarkovsky–O'Keefe–Radzievskii–Paddack effect
- Yarlung Tsangpo Grand Canyon
- Yaroslav Pustovyi
- Yash Pal
- Yashwant Gupta
- Yates's
- Yatsugatake South Base Observatory
- Yavanajataka
- Yavaneśvara
- Yawn
- Yazoo stream
- Yaël Nazé
- Yaʿqūb ibn Ṭāriq
- Ye Horns Inn
- Ye Olde Cock Tavern
- Ye Olde Dolphin Inne
- Ye Olde Mitre
- Ye Olde Tavern, Kington
- Ye Shuhua
- Year 2000 problem
- Year Million
- Year of Hell
- Year of the Solar System
- Year zero
- Yearbook of the Association of Pacific Coast Geographers
- Yeats (crater)
- Yebes Observatory
- Yebes Observatory RT40m
- Yedoma
- Yehuda Farissol
- Yehuda ben Moshe
- Yelena Kondakova
- Yelena Serova
- Yellow Emperor
- Yellow giant
- Yellow hypergiant
- Yellow supergiant star
- Yellowknife Bay, Mars
- Yellowstone Caldera
- Yellowstone Volcano Observatory
- Yellowstone hotspot
- Yenisey
- Yeniseysk-15
- Yerkes (crater)
- Yerkes 41-inch reflector
- Yervant Terzian
- Yesod
- Yesterday's Enterprise
- Yesteryear (Star Trek: The Animated Series)
- Yet Another Movie
- Yevgeni Nikolayevich Andreyev
- Yevgenia Bugoslavskaya
- Yevgeny Khrunov
- Yevgeny Korotkevich
- Yevgeny Krinov
- Yevgeny Ostashev
- Yevgeny Tolstikov
- Yevpatoria RT-70 radio telescope
- Yhi
- Yi So-yeon
- Yi Xing
- Yilgarn Craton
- Yilmaz theory of gravitation
- Yinghuo-1
- Yinpterochiroptera
- Yip Yips
- Yitzhak Maron
- Ylem
- Ymer (journal)
- Ymir (moon)
- Yo-yo de-spin
- Yobai
- Yod (astrology)
- Yoda purpurata
- Yoga (Hindu astrology)
- Yoga nidra
- Yoga-karakas
- Yogi Rock
- Yohaulticetl
- Yohkoh
- Yojana
- Yoko Tsuno
- Yokose virus
- Yoldia Sea
- Yolki 5
- Yonaguni Monument
- Yondu
- Yongsong Huang
- Yorick (programming language)
- York Minster astronomical clock
- Yorkshire Grey, Fitzrovia
- Yorkshire Planetarium
- Yoshiaki Banno
- Yoshiaki Oshima
- Yoshikane Mizuno
- Yoshikawa (crater)
- Yoshimi Battles the Pink Robots, Pt. 1
- Yoshinobu Launch Complex
- Yoshio Kushida
- Yoshio Sakamoto
- Yoshisada Shimizu
- Yoshitaka Amano
- You Are Old, Father William
- You Make My Dreams
- You Owe Me (The Chainsmokers song)
- You're Whole
- You're in Love with a Psycho
- You, Me and the Apocalypse
- YouTube Space Lab
- Young & Wild (2012 film)
- Young (crater)
- Young Engineers' Satellite 2
- Young Jedi Knights
- Young Lust (song)
- Young Merlin
- Young Scientist Programme
- Young grab
- Young stellar object
- Young's
- Young's Cove Group
- Younger Dryas
- Younger Dryas impact hypothesis
- Your Name
- Your Possible Pasts
- Your Pretty Face Is Going to Hell
- YouthSat
- Yrjö Väisälä
- Ythaq: The Forsaken World
- Yu Chol-u
- Yuan Wang-class tracking ship
- Yuba City Astronomical Observatory
- Yubileiny
- Yubileyniy Airport
- Yubu
- Yuck, A Love Story
- Yudhanjaya Wijeratne
- Yue Lao
- Yuegong-1
- Yuga
- Yuga Cycle
- Yuggoth
- Yuji Hyakutake
- Yuk L. Yung
- Yuki Okoda
- Yukon Ice Patches
- Yuktibhāṣā
- Yuli Berkovich
- Yuma creation myth
- Yume Kūkan
- Yumemi Kobo
- Yun Feng
- Yun Sǒn-Do (crater)
- Yun Wang
- Yungas pygmy owl
- Yungas screech owl
- Yunnan Astronomical Observatory
- Yuri (satellite)
- Yuri Baturin
- Yuri Gagarin
- Yuri Gagarin Cosmonaut Training Center
- Yuri Gidzenko
- Yuri Ivashchenko
- Yuri Kondratyuk
- Yuri Lysianskyi
- Yuri Malenchenko
- Yuri Malyshev (cosmonaut)
- Yuri Pavlovich Shvets
- Yuri Shargin
- Yuri's Night
- Yurij N. Krugly
- Yuriy Drohobych
- Yuriy G. Shkuratov
- Yury Lonchakov
- Yury Mukhin (activist)
- Yury Onufriyenko
- Yury Usachov
- Yusaku Maezawa
- Yutu (rover)
- Yutu-2
- Yuty (crater)
- Yuval Ne'eman
- Yuzhmash
- Yuzhmashavia
- Yuzhnoye Design Office
- Yvan Dutil
- Yves Deruyter
- Yves Fortier Earth Science Journalism Award
- Yves Pomeau
- Yvonne Brill
- Yvonne Cagle
- Yvonne Elsworth
- Yvonne Pendleton
- Yūko Kakazu
- Z (video game)
- Z Andromedae
- Z Apodis
- Z Camelopardalis
- Z Canis Majoris
- Z Carinae
- Z Chamaeleontis
- Z Pulsed Power Facility
- Z Ursae Minoris
- Z-Division
- Z-Stoff
- Z-pinch
- Z8 GND 5296
- Z: Steel Soldiers
- ZACube-1
- ZEPLIN-III
- ZETA (fusion reactor)
- ZFOURGE
- ZIL-2906
- ZIMPOL/CHEOPS
- ZOOMQ3D
- ZTF J0139+5245
- ZTF J153932.16+502738.8
- ZW II 96
- ZZ Boötis
- ZZT (duo)
- Zabrodje meteorite
- Zach (crater)
- Zach Galifianakis
- Zacharias Janssen
- Zack Snyder
- Zack Snyder's Justice League
- Zack Taylor
- Zadeni (crater)
- Zag de Sujurmenza
- Zagami meteorite
- Zagreb Observatory
- Zagros Mountains
- Zagut (crater)
- Zaheer (The Legend of Korra)
- Zairja
- Zaisho
- Zak McKracken and the Alien Mindbenders
- Zak McKracken: Between Time and Space
- Zakariya al-Qazwini
- Zakharov system
- Zaklodzie meteorite
- Zaleucus
- Zamama (volcano)
- Zambelli Fireworks
- Zambia
- Zandru's Forge
- Zanstra (crater)
- Zanstra method
- Zaofu
- Zapadnaya crater
- Zaphod Beeblebrox
- Zarya
- Zarya (spacecraft)
- Zasyadko (crater)
- Zathura: A Space Adventure
- Zax: The Alien Hunter
- Zaxxon 3D
- Zdenek Sekanina
- Zdeněk Kopal
- Zdeněk Moravec
- Zdeněk Švestka
- Zdeňka Vávrová
- ZeD
- Zeami (crater)
- Zebola
- Zecharia Sitchin
- Zeeman (crater)
- Zeeman effect
- Zeeman–Doppler imaging
- Zeiram
- Zeiss Biogon
- Zeiss Ikon Kolibri
- Zeiss Loxia 2.8/21
- Zeiss Major Planetarium
- Zeiss Planar
- Zeiss Sonnar
- Zeiss projector
- Zeitgeber
- Zeitschrift für Geologische Wissenschaften
- Zeitschrift für Geomorphologie
- Zeldovich pancake
- Zeleny Gai crater
- Zelinskiy (crater)
- Zeller's congruence
- Zemlyanka
- Zena Cardman
- Zener effect
- Zenit (satellite)
- Zenit-2
- Zenit-2M
- Zenit-3F
- Zenit-3SLB
- Zenit-C
- Zenith
- Zenith camera
- Zenith telescope
- Zenithal hourly rate
- Zeno (crater)
- Zeno of Elea
- Zenon Jankowski
- Zenon: The Zequel
- Zenon: Z3
- Zeo, Inc.
- Zephyr (rover)
- Zephyr Rocket
- Zernike (crater)
- Zero 2 Infinity
- Zero 5 (Atari Jaguar game)
- Zero Escape: Virtue's Last Reward
- Zero Gradient Synchrotron
- Zero Gravity Research Facility
- Zero Hour (Star Trek: Enterprise)
- Zero Point (photometry)
- Zero field splitting
- Zero shadow day
- Zero spacing flux
- Zero-5
- Zero-X
- Zero-curtain effect
- Zero-drag satellite
- Zero-energy universe
- Zero-level elevation
- Zero-phonon line and phonon sideband
- Zero-propellant maneuver
- Zero-velocity surface
- Zerovalent iron
- Zeta Andromedae
- Zeta Antliae
- Zeta Apodis
- Zeta Aquarii
- Zeta Aquilae
- Zeta Arae
- Zeta Arietis
- Zeta Aurigae
- Zeta Boötis
- Zeta Caeli
- Zeta Cancri
- Zeta Canis Majoris
- Zeta Canis Minoris
- Zeta Capricorni
- Zeta Cassiopeiae
- Zeta Centauri
- Zeta Cephei
- Zeta Ceti
- Zeta Chamaeleontis
- Zeta Circini
- Zeta Coronae Australis
- Zeta Coronae Borealis
- Zeta Corvi
- Zeta Crateris
- Zeta Crucis
- Zeta Cygni
- Zeta Delphini
- Zeta Doradus
- Zeta Draconis
- Zeta Eridani
- Zeta Fornacis
- Zeta Geminorum
- Zeta Gruis
- Zeta Herculis
- Zeta Herculis Moving Group
- Zeta Horologii
- Zeta Hydrae
- Zeta Hydri
- Zeta Indi
- Zeta Leonis
- Zeta Leporis
- Zeta Librae
- Zeta Lupi
- Zeta Lyrae
- Zeta Major
- Zeta Mensae
- Zeta Microscopii
- Zeta Monocerotis
- Zeta Muscae
- Zeta Normae
- Zeta Ophiuchi
- Zeta Pavonis
- Zeta Pegasi
- Zeta Persei
- Zeta Perseids
- Zeta Phoenicis
- Zeta Pictoris
- Zeta Piscis Austrini
- Zeta Piscium
- Zeta Puppis
- Zeta Pyxidis
- Zeta Reticuli
- Zeta Sagittae
- Zeta Sagittarii
- Zeta Scorpii
- Zeta Sculptoris
- Zeta Scuti
- Zeta Serpentis
- Zeta Tauri
- Zeta Telescopii
- Zeta Trianguli Australis
- Zeta Tucanae
- Zeta Ursae Minoris
- Zeta Virginis
- Zeta Volantis
- Zeta function regularization
- Zeta1 Antliae
- Zeta1 Lyrae
- Zeta1 Muscae
- Zeta1 Scorpii
- Zeta2 Antliae
- Zeta2 Lyrae
- Zeta2 Muscae
- Zeta2 Scorpii
- Zetan
- Zetland Arms
- Zeus
- Zeytun Gospels
- Zhai Zhigang
- Zhamanshin crater
- Zhang Daqing
- Zhang Jiaxiang
- Zhang Qingwei
- Zhang Sixun
- Zhang Xiaoguang
- Zhang Yuzhe
- Zhang Yuzhe (crater)
- Zhanna Yorkina
- Zhao Chuandong
- Zhao Jincai
- Zhen Luan
- ZhengHe (spacecraft)
- Zhiritskiy (crater)
- Zhongwei-Tongxin fault
- Zhou Dunyi
- Zhukovskiy (crater)
- Zhulong (mythology)
- Zi Wei (crater)
- Zi wei dou shu
- Zielony Balonik
- Zig and Zag (puppets)
- Ziggurat of Ur
- Ziggy Stardust (song)
- Zij
- Zij al-Sindhind
- Zij-i Ilkhani
- Zij-i Sultani
- Ziki Shaked
- Zilair (crater)
- Zillion (video game)
- Zillion II
- Zimbabwe
- Zimmer tower
- Zimmerwald Observatory
- Zinaida Aksentyeva
- Zinner (crater)
- Zircon (satellite)
- Zirconic
- Zisa Corona
- Zita Martins
- Ziyuan (satellite)
- Ziyuan 3-01
- Zmija Facula
- Znamya (satellite)
- Zodac
- Zodi
- Zodiac
- Zodiac Man
- Zodiac and Swastika
- Zodiac: Signs of the Apocalypse
- Zodiacal light
- Zoe Heriot
- Zoe's Tale
- Zoharei Chama Synagogue
- Zola (crater)
- Zoliflodacin
- Zolpidem
- Zoltán Balog (astronomer)
- Zombie Bums from Uranus
- Zombie Nation (musician)
- Zombie Strippers
- Zombie Wars
- Zombie satellite
- Zombie star
- Zombies of the Stratosphere
- Zonal flow (plasma)
- Zond 1
- Zond 2
- Zond 3
- Zond 3MV-1 No.2
- Zond 4
- Zond 5
- Zond 6
- Zond 7
- Zond 8
- Zond L1S-1
- Zond failed missions
- Zond program
- Zone Warrior
- Zone axis
- Zone of Avoidance
- Zone of the Enders
- Zone of the Enders: 2167 Idolo
- Zone of the Enders: The 2nd Runner
- Zongo (crater)
- Zontar, the Thing from Venus
- Zoo hypothesis
- Zoogeography
- Zoom lens
- Zoombak
- Zooniverse
- Zoran Knežević (astronomer)
- Zoran Stefanović
- Zorba the Hutt's Revenge
- Zorya
- Zossed in Space
- Zotino Tall Tower Observation Facility
- Zou Yixin
- Zouk (club)
- Zoë (robot)
- Zselic National Landscape Protection Area
- Zsigmondy (crater)
- Zu Chongzhi
- ZubaBox
- Zubenhakrabi
- Zucchius (crater)
- Zulema L'Astròloga
- Zuma (satellite)
- Zumba (crater)
- Zumurrud (crater)
- Zunil (crater)
- Zupus (crater)
- Zvezda (ISS module)
- Zvezda (moonbase)
- Zvi Ben-Avraham
- Zweibrücken Observatory
- Zwicky (crater)
- Zwicky Transient Facility
- Zwicky's Triplet
- Zygon
- Zygosaccharomyces bailii
- Zytglogge
- Zytturm, Zug
- Zähringer (crater)
- Zöllner (crater)
- Zār
- Áine
- Álfröðull
- Álvaro López-García
- Ángel López Jiménez
- Åke Sundborg
- Åke Wallenquist
- ÇOMÜ Ulupınar Observatory
- École Nationale Supérieure de Géologie
- École nationale supérieure des industries agricoles et alimentaires
- Édmée Chandon
- Édouard Stephan
- Élisabeth Vonarburg
- Émile Allegret
- Émile Merlin
- Équiterre
- Éridan (rocket)
- Étaín
- Étienne Léopold Trouvelot
- Évry Schatzman
- ÑuSat
- Ólafur Arnalds (scientist)
- Öko-Institut
- Östen Bergstrand
- Österplana 065
- Överkalix study
- Ørsted (satellite)
- Østervold Observatory
- Øystein Elgarøy
- Über das farbige Licht der Doppelsterne und einiger anderer Gestirne des Himmels
- Überbrettl
- Ādityas
- Črni Vrh Observatory
- Ēostre
- Ħal Resqun Catacombs
- Ītzpāpālōtl
- İsmail Akbay
- Ľubor Kresák
- Ľudmila Pajdušáková
- Łowicz (meteorite)
- Ōizumi Observatory
- Ōkyo (crater)
- Śaṅkaranārāyaṇa
- Śrīpati
- Šafařík (crater)
- Šimige
- Štefánik's Observatory
- Željko Ivezić
- Žemaitkiemis meteorite
- ʻImiloa Astronomy Center
- ʻOumuamua
- ʽAziziya District
- ΔT (timekeeping)
- Ṛtú