List of astronomical topics

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This page aims to list articles on Wikipedia that are related to astronomy, astrophysics and cosmology. This is so that those interested in the subject can monitor changes to the pages by clicking on Related changes in the sidebar.

The list is not necessarily complete or up to date - if you see an article that should be here but isn't (or one that shouldn't be here but is), please update the page accordingly.

Three astronomy related WikiProjects are being developed, please visit WikiProject Astronomical Objects, WikiProject Constellations, and WikiProject Telescopes.


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0–9

1 Ceres -- 1P/Halley -- 1st High Energy Astrophysics Observatory -- 2 Pallas -- 2M1207 -- 2M1207 b -- 2M1207b -- 2MASS -- 2P/Encke -- 2dF Galaxy Redshift Survey -- 2C -- 3 Juno -- 3C -- 3C9 -- 3C48 -- 3C58 -- 3C191 -- 3C273 -- 3D/Biela -- 3.67 m Advanced Electro Optical System Telescope -- 4 Vesta -- 4C -- 4C Array -- 5 Astraea -- 5C -- 6C -- 8C -- 9C -- 9P/Tempel -- 10 Hygiea -- 12P/Pons-Brooks -- 14 Herculis -- 15 Eunomia -- 16 Cygni -- 16 Psyche -- 20 Massalia -- 21 Lutetia -- 21P/Giacobini-Zinner -- 24 Themis -- 25 Phocaea -- 29P/Schwassmann-Wachmann -- 31 Euphrosyne -- 34 Tauri -- 40 Eridani -- 43 Ariadne -- 44 Nysa -- 45 Eugenia -- 47 Ursae Majoris -- 48 Doris -- 51 Pegasi -- 51 Pegasi B -- 51 Pegasi b -- 52 Europa -- 55 Cancri -- 55P/Tempel-Tuttle -- 61 Cygni -- 61 Cygni A -- 61 Cygni B -- 65 Cybele -- 67P/Churyumov-Gerasimenko -- 70 Virginis -- 71 Niobe -- 81P/Wild -- 87 Sylvia -- 90 Antiope -- 92 Undina -- 93 Minerva -- 94 Aurora -- 95 Arethusa -- 106 Dione -- 107 Camilla -- 110 Lydia -- 153 Hilda -- 154 Bertha -- 221 Eos -- 243 Ida -- 253 Mathilde -- 279 Thule -- 323 Brucia -- 324 Bamberga -- 342 Endymion -- 433 Eros -- 434 Hungaria -- 451 Patientia -- 511 Davida -- 588 Achilles -- 624 Hektor -- 674 Rachele -- 704 Interamnia -- 944 Hidalgo -- 951 Gaspra -- 1036 Ganymed -- 1221 Amor -- 1566 Icarus -- 1620 Geographos -- 1685 Toro -- 1862 Apollo -- 2001 QR₃₂₂ -- 2003 EL61 -- 2003 UB313 -- 2004 AS1 -- 2005 FY9 -- 2060 Chiron -- 2062 Aten -- 2063 Bacchus -- 3001 Michelangelo -- 3018 Godiva -- 3200 Phaethon -- 3467 Bernheim -- 3753 Cruithne -- 3834 Zappafrank -- 4179 Toutatis -- 4544 Xanthus -- 4593 Reipurth -- 4769 Castalia -- 5145 Pholus -- 5261 Eureka -- 5381 Sekhmet -- 5535 Annefrank -- 7066 Nessus -- 11169 Alkon -- 18610 Arthurdent -- 28978 Ixion -- 50000 Quaoar -- 90377 Sedna -- 90482 Orcus -- 99942 Apophis --

A

A New Theory of Magnetic Storms -- A-type asteroid -- Aaronson, Marc -- Abdulmelik, Chalid Ben -- Abell, George Ogden -- Aberration in optical systems -- Aberration of light -- Absolute Visual Magnitude -- Absolute date -- Absolute magnitude -- Accelerating universe -- Accretion disc -- Accretion disk -- Achernar -- Achondrite -- Achromatic doublet -- Achromatic lens -- Acrux -- Active Galactic Nuclei -- Active galactic nuclei -- Active galaxy -- Active optics -- Adams, John Couch -- Adaptive optics -- Adara -- Adelard of Bath -- Adhara -- Adler Planetarium -- Adrastea -- Advanced Satellite for Cosmology and Astrophysics -- Aether -- Aether theory -- Afterglow -- AGASA -- Age of the Earth -- Age of the Universe -- Age of the universe -- AIPS -- Airglow -- Airy disc -- Airy, George -- Aitken, Robert -- Al Sufi -- Al Sufi, 'Abd Al-Rahman -- Al-Batani -- Al-Khwarizmi -- Albategnius -- Albedo -- Albert Abraham Michelson -- Albiorix (moon) -- Albireo -- Alcor -- Aldebaran -- Aldhelm, Bishop of Sherborne -- Alfonsine tables -- Alfonso X of Castile -- Alfven universe -- Alfvén, Hannes Olof Gösta -- Algieba -- Algol -- ALH84001 -- Alioth -- Alkaid -- Allegheny Observatory -- Almach -- Almagest -- Alnilam -- Alnitak -- Alniyat -- Alpha Andromedae -- Alpha Centauri -- Alpha Centauri A -- Alpha Centauri B -- Alpha Persei -- Alpha process -- Alpher-Bethe-Gamow theory -- Alpheratz -- Alphonsine tables -- Altair -- Altazimuth mount -- Altitude -- Aludra -- Alura -- Amalthea (moon) -- Amateur astronomy -- Amateur telescope making -- American Astronomical Society -- American Nebula -- Amor asteroid -- Amort, Eusebius -- Analemma -- Ananke (moon) -- Ananke group -- Anaximander -- Andromeda (constellation) -- Andromeda Galaxy -- Andronicus of Cyrrhus -- Anglo-Australian Telescope -- Angular diameter -- Angular diameter distance -- Angular frequency -- Angular measurement -- Angular resolution -- Annibale de Gasparis -- Annie Jump Cannon -- Anomalistic month -- Anomalous cosmic ray -- Anomalous phenomenon -- Anomaly (astronomy) -- Antarctic Submillimeter Telescope and Remote Observatory -- Antares -- Antenna (electronics) -- Anthropic principle -- Antlia -- Antonín Mrkos -- Apastron -- Aperture -- Aperture Masking Interferometry -- Aperture synthesis -- Aphelion -- Apoapsis -- Apogee -- Apollo -- Apollo 11 -- Apollo 17 -- Apollo asteroid -- Apollo program -- Apparent Visual Magnitude -- Apparent magnitude -- Apparent motion -- Apparent solar day -- Apsides -- Apsis -- Apus -- Aquarius -- Aquila (constellation) -- Arago, Dominique -- Arago, François Jean Dominique -- Aratus -- Archaeoastronomy -- Archimedes -- Arcminute -- Arcminute Microkelvin Imager -- Arcsecond -- Arcturus -- Arecibo Observatory -- Arecibo radio telescope -- Argo Navis -- Argument of Perihelion -- Argument of the perihelion -- Ariane 5 -- Ariel -- Aries -- Aristarchos 2.3 m Telescope Project -- Aristarchus -- Aristotle -- Arjuna -- Armillary sphere -- Arno Penzias -- Arp, Halton -- Array of Low Energy X-ray Imaging Sensors -- Arrhenius, Svante -- Artemova, Ioulia Vladimirovna -- Aryabhata -- Asterism (astronomy) -- Asteroid -- Asteroid belt -- Asteroid deflection strategies -- Asteroid moon -- Asteroid spectral types -- Asteroseismology -- Astigmatism -- ASTRO-E -- Astrobiology -- Astrochemistry -- Astrodynamics -- Astrolabe -- Astrological sign -- Astrometric binary -- Astrometry -- Astronautics -- Astronomer -- Astronomer Royal -- Astronomers -- Astronomical -- Astronomical Journal -- Astronomical Julian calendar -- Astronomical Society of the Pacific -- Astronomical Unit -- Astronomical aberration -- Astronomical body -- Astronomical catalogue -- Astronomical conjunction -- Astronomical distance -- Astronomical naming conventions -- Astronomical object -- Astronomical opposition -- Astronomical seeing -- Astronomical society -- Astronomical spectroscopy -- Astronomical transit -- Astronomical unit -- Astronomical year numbering -- Astronomy -- Astronomy and astrophysics -- Astrophotography -- Astrophysical Journal -- Astrophysicist -- Astrophysics -- Astrophysics Data System -- Asymptotic Giant Branch -- Atacama Large Millimeter Array -- Aten -- Aten asteroid -- Athena (Mars missions in disambiguation) -- Atkinson, Robert -- Atlas (moon) -- Atmosphere -- Atria -- Aura -- Auriga (constellation) -- Auroral light -- Australia Telescope Compact Array -- Automated Patrol Telescope -- Autumnal equinox -- Auva -- Avg. Orbital Speed -- Avior -- Axial tilt -- Axis of rotation -- Azimuth --

B

B-type asteroid -- Baade, Walter -- Background (astronomy) -- Background radiation -- Bacon, Roger -- Bahá'í calendar -- Bahcall, John -- Bainbridge, John -- Baldwin, John -- Balthasar Behem Codex -- Banneker, Benjamin -- Barnard's Star -- Barnard's star -- Barnard's star -- Barnard, Edward Emerson -- Barred spiral galaxy -- Barringer Crater -- Barsoom -- Barycenter -- Baryogenesis -- Baryonic matter -- Bayer designation -- Bayer, Johann -- Be X-ray binaries -- Be star -- Becrux -- Bedford Catalogue -- Behenian fixed stars -- Bekenstein, Jacob -- Belinda (moon) -- Bell, Jocelyn -- Bellatrix -- BeppoSAX -- Berlin Observatory -- Bernard Lovell -- Bernoulli, Jakob -- Bernoulli, Johann -- Bessel, Friedrich -- Beta Centauri -- Beta Pictoris -- Betelgeuse -- Beyond the standard Big Bang model -- Bianca (moon) -- Big Bang -- Big Bang nucleosynthesis -- Big Bear Solar Observatory -- Big Crunch -- Big Dipper -- Big Rip -- Big bang -- Big bang nucleosynthesis -- Binary asteroid -- Binary star -- Binary system -- Binoculars -- BL Lac object -- Black body -- Black dwarf -- Black hole -- Black hole thermodynamics -- Black holes -- Blazar -- Bliss, Nathaniel -- Blue giant -- Blue straggler -- Boötes -- Bode, Johann Elert -- Bohr model -- Bohr, Niels -- Bolometer -- Bolometric magnitude -- Bolyai, Janos -- Bondi, Hermann -- Bond, William Cranch -- Bonner Durchmusterung -- Boomerang nebula -- Boss, Lewis -- Boulder Sunspot Number -- Boötes -- Bradley, James -- Brahe, Tycho -- Brane -- Brane cosmology -- Brera Observatory -- Brett J. Gladman -- Bright nebula -- Brightness -- Broad Band X-ray Telescope -- Brocchi's Cluster -- Brocchi's Cluster -- Broglie, Louis-Victor de -- Brown dwarf -- Brown, Michael E. -- Brown, Robert Hanbury -- Bruce Medal -- Brudzewski, Albert -- Brussels Observatory -- BTA-6 -- Bulge (astronomy) -- Burbidge, Geoffrey -- Burbidge, Margaret -- Bureau des Longitudes -- Butterfly Cluster --

C

C-type asteroid -- Caelum -- Calendar Round -- Caliban (moon) -- Callisto (moon) -- Caltech Submillimeter Observatory -- Calypso (moon) -- Calypso (moon) -- Cambridge Interferometer -- Cambridge Low Frequency Synthesis Telescope -- Cambridge Optical Aperture Synthesis Telescope -- Camelopardalis -- Canada-France-Hawaii Telescope -- Canada-France-Hawaii telescopes -- Canadian Arrow -- Canadian Space Agency -- Cancer (constellation) -- Canes Venatici -- Canis Major -- Canis Major (dwarf galaxy) -- Canis Minor -- Cannon, Annie -- Canopus -- Canopus (star) -- Capella (star) -- Capella (star) -- Capricorn -- Capricornus -- Carbon star -- Cardinal directions -- Carina -- Carina (constellation) -- Carlsberg Meridian Telescope -- Carme -- Carme (moon) -- Carme group -- Carolyn S. Shoemaker -- Carpo (moon) -- Carrington, Richard -- Cartesian coordinate system -- Cartier, Pierre -- Cartography -- Cartwheel Galaxy -- Cassegrain Reflector -- Cassegrain telescope -- Cassegrain, Guillaume -- Cassini probe -- Cassini, Giovanni Domenico -- Cassini-Huygens -- Cassini-Huygens Mission -- Cassiopeia -- Cassiopeia (constellation) -- Castor -- Castor (star) -- Cataclysmic variable star -- Catadioptric sensor -- Catalogue of Galaxies and of Clusters of Galaxies -- Cavalieri, Bonaventura -- Cavendish Astrophysics Group -- Ceiba -- Celestial body -- Celestial body atmosphere -- Celestial body's atmosphere -- Celestial coordinate system -- Celestial dynamics -- Celestial equator -- Celestial mechanics -- Celestial navigation -- Celestial pole -- Celestial sphere -- Celsius, Anders -- Celtes, Conrad -- Centaur -- Centaur -- Centaur rocket -- Centaurus -- Cepheid variable -- Cepheus -- Cepheus (constellation) -- Cerro Tololo telescope -- Cetus -- CfA 1.2 m Millimeter-Wave Telescope -- Chad Trujillo -- Chamaeleon -- Chandler wobble -- Chandra X-ray Observatory -- Chandra X-ray Telescope -- Chandrasekhar limit -- Chandrasekhar, Subrahmanyan -- CHARA array -- Charles T. Kowal -- Charon (moon) -- Charon (moon) -- Chatelet, Emilie du -- Cherenkov Array at Themis -- Chinese constellation -- Chiron -- Chondrite -- Chondrites -- Christie, William -- Chromatic aberration -- Chromosphere -- Chrétien, Henri -- Circinus -- Circle of confusion -- Circle of latitude -- Circumpolar star -- Circumstellar disk -- Civil Year -- Clark, Alvan -- Classical mechanics -- Classical physics -- CLOVER array -- Closure phase -- CNES -- Cnidus -- CNO cycle -- Coalsack Nebula -- COBE -- Cold dark matter -- Collinder catalogue -- Collinder, Per -- Color index -- Color temperature -- Columba (constellation) -- Coma (cometary) -- Coma (optics) -- Coma (cometary) -- Coma Berenices -- Coma aberration -- Coma galaxy cluster -- Comet -- Comet Encke -- Comet Halley -- Comet Shoemaker-Levy 9 -- Comet Tempel-Tuttle -- Comoving distance -- Compact object -- Compact star -- Compass -- Compton Gamma Ray Observatory -- Compton effect -- Compton scattering -- Concave -- Cone Nebula -- Conon of Samos -- Constellation -- Constellation-X -- Contact binary -- Convex -- Copernican -- Copernican heliocentric system -- Copernican principle -- Copernican revolution -- Copernicus -- Copernicus, Nicolaus -- Copley Medal -- Cordelia (moon) -- Cornelius Agrippa -- Corona -- Corona Australis -- Corona Borealis -- Coronagraph -- Coronal gas -- Corot (astronomy) -- Corvus (constellation) -- Cosmic Anisotropy Telescope -- Cosmic Background Explorer satellite -- Cosmic Background Imager -- Cosmic Background Radiation -- Cosmic background radiation -- Cosmic censorship hypothesis -- Cosmic inflation -- Cosmic microwave background -- Cosmic microwave background radiation -- Cosmic radiation -- Cosmic ray -- Cosmic ray spallation -- Cosmic rays -- Cosmogony -- Cosmological Principle -- Cosmological constant -- Cosmological principle -- Cosmological time -- Cosmology -- Cosmonaut -- Côte d'Azur Observatory -- Coudé design -- Crab Nebula -- Crater (impact) -- Crater (constellation) -- Creation of the Universe -- Cressida (moon) -- CRESU experiment -- Crisium basin -- Cryogenic Dark Matter Search -- Cubewano -- Cygnus -- Cygnus (constellation) -- Cygnus A -- Cygnus X-1 --

D

d'Alembert, Jean le Rond -- D-type asteroid -- Dactyl (asteroid) -- Dactyl (asteroid) -- Damocloid -- Danjon Scale -- Danjon, André -- Daphnis -- Dark energy -- Dark matter -- Dark moon -- Dark nebula -- Darwin (ESA) -- Darwin (crater) -- David H. Levy -- David L. Rabinowitz -- Dawn -- de Lacaille, Nicolas Louis -- De Revolutionibus Orbium Coelestium -- de Vaucouleurs, Gérard -- Debye length -- Declination -- Deep sky object -- Deferent and epicycle -- Degenerate matter -- Degree (angle) -- Deimos (moon) -- Deimos (moon) -- Delphinus -- Delphinus (constellation) -- Deneb -- Denebola -- Desdemona (moon) -- Desdemona (moon) -- Despina (moon) -- Despina (moon) -- Detached binary -- Diffraction -- Diffraction-limited -- Diffuse sky radiation -- Dingle, Herbert -- Dione (moon) -- Dione (moon) -- Dirac, Paul -- Disc (galaxy) -- Dispersion (optics) -- Diurnal motion -- Dmitri Maksutov -- Dobsonian -- Dobsonian mount -- Dollfus, Audouin -- Dome C -- Doppler effect -- Doppler shift -- Dorado -- Double pendulum -- Double star -- Draco -- Draco (constellation) -- Drake equation -- Drake, Frank -- Draper, Henry -- Dreyer, John -- Drift velocity -- Dubhe -- Dumbbell Nebula -- Duncan, Robert -- Dusk -- Dust -- Dutch Open Telescope -- Dwarf elliptical galaxy -- Dwarf galaxy -- Dwarf spheroidal galaxy -- Dynamical system -- Dynamical systems and chaos theory -- Dyson, Frank -- Dyson, Freeman --

E

E-type asteroid -- Early Imbrian -- Earth -- Earth atmosphere -- Earth impacts -- Earth's atmosphere -- Earth's magnetic field -- Earthshine -- Eccentric anomaly -- Eccentricity -- Eccentricity (orbit) -- Eclipse -- Eclipsing binary -- Ecliptic -- Ecliptic coordinate system -- Ecliptic longitude -- Eddington Medal -- Eddington limit -- Eddington luminosity -- Eddington, Arthur -- Edmund Halley -- Edward Charles Pickering -- Effelsberg -- Einstein -- Einstein Observatory -- Einstein shift -- Einstein, Albert -- Elara (moon) -- Eleanor F. Helin -- Electromagnetic radiation -- Electromagnetic spectrum -- Elliptic orbit -- Elliptical Galaxy M87 -- Elliptical galaxy -- Elliptical orbit -- Elnath -- Elongation -- Elve -- Emission line -- Emission nebula -- Enceladus (moon) -- Enceladus (moon) -- Encke division -- Encke, Johann Franz -- Energy density -- English equatorial mount -- Ephemeris -- Ephemeris Time -- Ephemeris time -- Epimetheus (moon) -- Epimetheus (moon) -- Epoch (astronomy) -- Epoch (astronomy) -- Eponym -- EPR paradox -- Epsilon Eridani -- Epsilon Indi -- Equation of time -- Equatorial bulge -- Equatorial coordinate system -- Equatorial mount -- Equinox -- Equuleus -- Eratosthenes -- Eratosthenian -- Eridanus (constellation) -- Eridanus (constellation) -- Ernest Rutherford -- Ernst Wilhelm Leberecht Tempel -- Erriapo (moon) -- Eruptive variable -- ESA -- ESA Space Debris Telescope -- Escape velocity -- Eta Carinae -- Ethane -- Euclid -- Euclidean geometry -- Euclidean space -- Euctemon -- Eudoxus of Cnidus -- Eugene M. Shoemaker -- Eugenia -- Euler angles -- Euler's angle -- Euler's angle -- Euler, Leonhard -- Europa (moon) -- Europa (moon) -- European Southern Observatory -- European Space Agency -- European VLBI Network -- Event horizon -- Everett many-worlds interpretation -- Everett, Hugh -- Exeligmos -- Exit pupil -- Exoplanet -- EXOSAT -- Exterrestrial intelligence -- Extragalactic astronomy -- Extrasolar planet -- Extraterrestrial life -- Extreme Universe Space Observatory -- Eyepiece --

F

F-number -- F-type asteroid -- Fabricius, David -- Fabricius, Johannes -- Facula -- Far infrared astronomy -- Far side (Moon) -- Farthest Galaxy -- Faulkes Telescope North -- Faulkes Telescope South -- Fermi paradox -- Fermi, Enrico -- Feynman, Richard -- Field (physics) -- Field curvature aberration -- Field of view -- Finderscope -- First Point of Aries -- First Point of Libra -- First light -- FITS -- FitzGerald-Lorentz Contraction -- Five College Radio Astronomy Observatory -- Flamsteed designation -- Flamsteed, John -- Flare star -- Flat earth -- Flatness problem -- Flux -- Focal length -- Focal plane -- Focus -- Fomalhaut -- Forbidden line -- Fork mount -- Fornax -- Fountain, John -- Four-vector -- Fowler, William -- Frame of reference -- François Arago -- François Jean Dominique Arago -- Frederick de Houtman -- Friedmann equations -- Friedmann-Lemaître-Robertson-Walker -- Friedrich Karl Arnold Schwassmann -- Friedrich Wilhelm Bessel -- Full moon -- Full moon cycle -- Full-sky Astrometric Mapping Explorer -- Fundamental plane -- Furud --

G

Gérard de Vaucouleurs -- G-type asteroid -- Gacrux -- Gaia probe -- Galactic astronomy -- Galactic bulge -- Galactic cluster -- Galactic coordinate system -- Galactic corona -- Galactic cosmic ray -- Galactic disk -- Galactic halo -- Galactic plane -- Galatea (moon) -- Galaxies -- Galaxy -- Galaxy Abell 1835 IR1916 -- Galaxy bulge -- Galaxy classification -- Galaxy cluster -- Galaxy disk -- Galaxy formation and evolution -- Galaxy halo -- Galaxy morphology -- Galaxy nucleus -- Galaxy rotation problem -- GALEX -- Galilean moon -- Galilean moons -- Galilean transformation -- Galileo Galilei -- Galileo probe -- Galileo spacecraft -- Galle, Johann Gottfried -- Gamma ray burst -- Gamma ray burster -- Gamma-ray Large Area Space Telescope -- Gamma-ray astronomy -- Gamow, George -- Ganymede (moon) -- Ganymede (moon) -- Gas giant -- Gassendi -- Gassendi crater -- Gathmann, Louis -- Gauss, Carl Friedrich -- Gaussian gravitational constant -- Gegenschein -- Geller, Margaret -- Gemini -- Gemini Observatory -- Geminids -- General Catalogue of Trigonometric Parallaxes -- General Relativity -- General relativity -- General theory of relativity -- Geocentric -- Geocentric model -- Geocentric universe -- Geodesic -- Geoid -- Geomagnetic storm -- George Gabriel Stokes -- Georges Lemaître -- Geostationary orbit -- German equatorial mount -- Giacconi, Riccardo -- Giant (star) -- Giant Magellan Telescope -- Giant Meterwave Radio Telescope (GMRT) -- Giant impact theory -- Giant molecular cloud -- Giant star -- Giovanni Battista Riccioli -- GJ 1061 -- Gliese 876 -- Gliese, Wilhelm -- Gliese-Jahreiss catalogue -- Globular cluster -- Goddard Space Flight Center -- Gold Medal of the Royal Astronomical Society -- Gold, Thomas -- Goldstone Deep Space Communications Complex -- Goldstone Radio Telescope -- Goodman-Martínez-Thompson correlation -- Gottfried Leibniz -- Gran Telescopio Canarias -- Grand Interferometre a 2 Telescopes -- Grand unification epoch -- Grand unification theory -- Gravitation -- Gravitational binding energy -- Gravitational collapse -- Gravitational constant -- Gravitational field -- Gravitational force -- Gravitational instability -- Gravitational lens -- Gravitational lensing -- Gravitational micro-lensing -- Gravitational redshift -- Gravitational singularity -- Gravitational slingshot -- Gravitational wave -- Gravitational waves -- Graviton -- Gravity -- Gravity wave -- Great Attractor -- Great Observatories program -- Great Red Spot -- Great Wall (astronomy) -- Great Wall (astronomy) -- Great circle -- Green Bank Telescope -- Greenwich -- Greenwich Mean Time -- Gregorian telescope -- Gregory, James -- Greisen-Zatsepin-Kuzmin limit -- Grigoriy N. Neujmin -- Groombridge 1830 -- Groups and clusters of galaxies -- GRS80 -- Grus -- Grus (constellation) -- Guldin -- Guth, Alan --

H

H II region -- H-R diagram -- H-alpha -- Hadar -- Haemus, Montes -- HALCA -- Hale telescope -- Hale, George Ellery -- Half-Mile Telescope -- Hall, Asaph -- Halley, Edmond -- Halo (optical phenomenon) -- Hamal -- Hamilton, William Rowan -- Hannes Olof Gösta Alfvén -- Hans Bethe -- Harvard College Observatory -- Harvard Revised catalogue -- Haverah Park experiment -- Hawking radiation -- Hawking, Stephen -- HD 209458b -- HE0107-5240 -- Heat death -- Heat-death of the Universe -- HEGRA -- Heka -- Helen B. Warner Prize for Astronomy -- Helene (moon) -- Heliacal rising -- Heliocentric -- Heliocentric model -- Heliocentrism -- Heliopause -- Helios -- Helioseismology -- Heliosphere -- Helium flash -- Helix Nebula -- Hemisphere -- Henri Poincaré -- Henry Draper Catalogue -- Henry Draper Medal -- Henry Draper catalogue -- Henry E. Holt -- Henry Norris Russell Lectureship -- Herakles -- Herbig-Haro object -- Hercules (constellation) -- Hercules Globular Cluster -- Herman of Carinthia -- Hermann Mayer Salomon Goldschmidt -- Hermann von Helmholtz -- Herschel Space Observatory -- Herschel, Caroline -- Herschel, John -- Herschel, William -- Hertzsprung, Ejnar -- Hertzsprung-Russell diagram -- Hesiod -- Hevelius, Johannes -- Hewish, Antony -- High Energy Transient Explorer -- High Resolution Fly's Eye Cosmic Ray Detector -- High-energy astronomy -- High-mass X-ray binaries -- Hilbert space -- Himalia (moon) -- Himalia group -- Hipparchus -- Hipparcos -- Hipparcos Catalogue -- Hipparcos catalogue -- History of astronomical interferometry -- History of astronomy -- History of telescopes -- Hoag's object -- Hobby-Eberly Telescope -- Hooker Telescope -- Horace Parnell Tuttle -- Horizon -- Horizon problem -- Horizontal branch -- Horizontal coordinate system -- Horn (telescope) -- Horologium -- Horoscope -- Horrendous Space Kablooie -- Horrocks, Jeremiah -- Horsehead Nebula -- Hot dark matter -- Hour angle -- Hourglass Nebula -- Houtermans, Fritz -- Hoyle, Fred -- Hubble Deep Field -- Hubble Law -- Hubble Nebula -- Hubble Origins Probe -- Hubble Space Telescope -- Hubble constant -- Hubble flow -- Hubble sequence -- Hubble's Law -- Hubble's law -- Hubble's law -- Hubble, Edwin -- Huchra, John -- Huggins, William -- Hulse, Russell -- Humason, Milton -- Huygens Region -- Huygens probe -- Huygens, Christiaan -- Hyades (star cluster) -- Hyades (star cluster) -- Hydra (constellation) -- Hydra (constellation) -- Hydrus -- Hypergalaxy -- Hyperion (moon) -- Hypernova -- Hyperon -- Hypothetical planet --

I

I Sin -- Iapetus (moon) -- IAU -- Icy moon -- Ijiraq (moon) -- Imbrian -- Immanuel Kant -- Impact basin -- Impact event -- Inclination -- Indigo -- Inductance -- Indus (constellation) -- Inex -- Inex -- Inferior and superior planets -- Inferior planet -- Inflationary epoch -- Infrared Optical Telescope Array -- Infrared Space Observatory -- Infrared astronomy -- Inner satellites of Jupiter -- INTEGRAL -- Integrated Sachs Wolfe effect -- Intensity -- Intensity interferometer -- Interacting binary stars -- Intercalary day -- Intercalary month -- Intercalation -- Interferometer -- Interferometer telescope -- Interferometry -- Intergalactic medium -- International Astronomical Union -- International Atomic Time -- International Earth Rotation and Reference Systems Service -- International Space Station -- International Star Registry -- International Sunspot Number -- Interplanetary Scintillation Array -- Interstellar cloud -- Interstellar dust -- Interstellar medium -- Introduction to Geomagnetically Trapped Radiation -- Io (moon) -- Ionosphere -- IPCC -- IRAF -- IRAS -- Irregular galaxy -- Irregular variable -- Isa, Ali Ben -- Isaac Newton Telescope -- Isolated singularity -- Italian Space Agency -- Ithaca Chasma --

J

J2000 -- J2000.0 -- Jacobus Kapteyn Telescope -- Jahreiss, Hartmut -- James Clerk Maxwell -- James Clerk Maxwell Telescope -- James Webb Space Telescope -- Jansky -- Jansky, Karl Guthe -- Janus (moon) -- Jeans, James -- Jennison, Roger Clifton -- Jet Propulsion Laboratory -- Jodrell Bank -- Jodrell Bank Observatory -- Johannesburg Observatory -- Jones, Harold -- Jovian planet -- Julian Calendar -- Julian calendar -- Julian date -- Julian day -- Julian epoch -- Julian year -- Juliet (moon) -- Jupiter (planet) -- Jupiter's natural satellites -- Jyotish --

K

K-type asteroid -- Kabbalistic -- Kaluza-Klein theory -- Kamacite -- Kapteyn's Star -- Kapteyn's Star -- Kapteyn, Jacobus -- Kavelaars, John J. -- Keck Interferometer -- Keck Observatory -- Keck telescope -- Keck telescopes -- Keeler, James Edward -- Kelvin-Helmholtz mechanism -- Kenneth S. Russell -- Kepler -- Kepler's laws of planetary motion -- Kepler's laws of planetary motion -- Kepler, Johannes -- Keplerian harmonic law -- Khayyám, Omar -- Kidinnu -- Kirkwood gap -- Kirkwood, Daniel -- Kitt Peak National Observatory -- Kiviuq (moon) -- Klet Observatory -- KOSMA -- Kristian Birkeland -- Kruger 60 -- KStars -- Kubiak, Marcin -- Kuiper Airborne Observatory -- Kuiper Belt -- Kuiper belt -- Kuiper, Gerard --

L

L-type asteroid -- La Silla Observatory -- Lacaille 9352 -- Lacaille, Nicolas Louis de -- Lacerta -- 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 -- Lagoon Nebula -- Lagrange, Joseph Louis -- Lagrangian mechanics -- Lagrangian point -- Lalande 21185 -- Lambda-CDM model -- Lambert, Johann Heinrich -- Lanczos, Cornelius -- Langley, Samuel Pierpont -- Langrange, Joseph-Louis de -- Lansberg's tables -- Lansberg, Philip Van -- Laplace, Pierre-Simon -- Large Binocular Telescope -- Large Magellanic Cloud -- Large liquid mirror telescope -- Large liquid mirror telescopes -- Large-scale structure of the cosmos -- Larissa -- Larson, Stephen -- Lassell, William -- Late Nectarian -- Latitude -- Laurent Cassegrain -- Law of universal gravitation -- LBT -- Le Verrier, Urbain -- Leavitt, Henrietta Swan -- Leda (moon) -- LEGRI -- Leiden Observatory -- Lemaître, Georges-Henri -- Lens (optics) -- Lens sag -- Lenticular galaxy -- Leo -- Leo Minor -- Leonids -- Lepus -- Lepus (constellation) -- Leuschner Observatory -- Levy, David -- Libra -- Libration -- Lick Observatory -- Light curve -- Light pollution -- Light year -- Light-time correction -- Light-year -- Lightyear -- LIGO -- LINEAR -- Lippershey, Hans -- LISA (astronomy) -- List of asteroids -- List of astronomers -- List of astronomical interferometers at visible and infrared wavelengths -- List of astronomical objects named after people -- List of astronomical topics -- List of astrophysicists -- List of brightest stars -- List of comets -- List of constellations by area -- List of craters on the Moon -- List of galaxies -- List of largest optical reflecting telescopes -- List of largest optical refracting telescopes -- List of meteor showers -- List of mnemonics for star classification -- List of molecules in interstellar space -- List of nearest stars -- List of non-periodic comets -- List of observatories -- List of optical telescopes -- List of periodic comets -- List of publications in physics -- List of radio telescopes -- List of semiregular variable stars -- List of solar system objects -- List of solar system objects by mass -- List of solar system objects by radius -- List of stars -- List of stars with confirmed extrasolar planets -- List of telescope types -- Little Dipper -- Liverpool Telescope -- Lobachevsky, Nikolai Ivanovich -- Local Group -- Local Supercluster -- LOFAR -- Lomonosov Gold Medal -- Long Count -- Long period variable -- Longitude -- Longitude of the ascending node -- Longitude prize -- Loop quantum gravity -- LOPES -- Lord Rosse -- Lorentz transformation -- Lorentz transformation equations -- Lorentz, Hendrik -- Lorentzian function -- Lorenz attractor -- Lorenz, Edward -- Lovell Radio Telescope -- Low Earth orbiting satellite -- Low-mass X-ray binaries -- Lowell Observatory -- Lowell, Percival -- Lower Imbrian -- Lucky imaging -- Luminance -- Luminiferous aether -- Luminosity -- Luminosity distance -- Luna -- Luna 9 -- Lunar -- Lunar calendar -- Lunar distance -- Lunar eclipse -- Lunar geologic timescale -- Lunar mare -- Lunar meteorite -- Lunar node -- Lunar phase -- Lunar precession -- Lunation -- Lunisolar calendar -- Lunisolar precession -- Lupus -- Lupus (constellation) -- Luyten Half-Second catalogue -- Lyapunov, Aleksandr -- Lyman alpha forest -- Lynx (constellation) -- Lyot filter -- Lyot, Bernard-Ferdinand -- Lyra -- Lysithea --

M

M-theory -- M-theory simplified -- M-type asteroid -- M100 -- M101 -- M104 -- M107 -- M13 -- M27 -- M31 -- M33 -- M41 -- M42 -- M45 -- M49 -- M57 -- M58 -- M59 -- M60 -- M61 -- M81 -- M81 Group -- M82 -- M84 -- M86 -- M87 -- M90 -- MacTutor archive -- Mach's principle -- Maffei Group -- Magdalena Ridge Observatory Interferometer -- Magellan (Telescopes) -- Magellanic Clouds -- MAGIC (telescope) -- Magnetar -- Magnetic flux tubes -- Magnetopause -- Magnetosphere -- Magnitude -- Magnitude comparison -- Main belt -- Main sequence -- Maksutov telescope -- Maksutov-Cassegrain -- Maksutov-Cassegrain telescope -- Manifold -- Manilius, Marcus -- Many-worlds interpretation -- Marcy, Geoffrey -- Mare Anguis -- Mare Australe -- Mare Cognitum -- Mare Crisium -- 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 Undarum -- Mare Vaporum -- Marius, Simon -- Mars -- Mars (planet) -- Mars Express -- Mars Global Surveyor -- Mars Pathfinder -- Mars-crosser asteroid -- Marshall Space Flight Center -- Martian meteorite -- Maser -- Maskelyne, Nevil -- Mass extinction -- Mass transfer -- Mass-energy equivalence -- Massive compact halo object -- Mauna Kea Observatory -- Mauna Loa Solar Observatory -- Maunder Minimum -- Mayor, Michel -- Maupertuis, Pierre Louis Moreau de -- Mauritius Radio Telescope -- Max Born -- Mayor, Michael -- McCormick Observatory -- McCrea, William -- McMath-Pierce Solar Telescope -- Mean anomaly -- Mean solar day -- Mean solar time -- Mean sun -- Megaparsec -- Megrez -- Mensa (constellation) -- MER-B -- Merak -- Mercator Telescope -- Mercator, Nicholas -- Mercury (planet) -- Meridian -- MERLIN -- Messier marathon -- Messier object -- Messier, Charles -- Metal-poor -- Metal-rich -- Metallicity -- Meteor -- Meteor shower -- Meteorite -- Meteorites classification -- Meteoroid -- Methone (moon) -- Metis (moon) -- Meton -- Metonic cycle -- Metric space -- Miaplacidus -- Michell, John -- Michelson-Morley experiment -- Microquasar -- Microscopium -- Microvariability and Oscillations of STars telescope -- Milankovitch cycles -- Milky Way -- Milky Way Galaxy -- Mills Cross Telescope -- Mimas (moon) -- Minkowski space -- Minor Planet Center -- Minor planet -- Mintaka -- Minute of arc -- Mir -- Mira -- Mira variable -- Mirach -- Miranda (moon) -- Miranda (moon) -- Mirfak -- Mizar -- MMT -- MMT Observatory -- Modern geocentrism -- Modified Newtonian dynamics -- Molecular cloud -- Molecular hydrogen -- Molonglo Cross Telescope -- Molonglo Observatory Synthesis Telescope -- Monoceros -- Monocular -- Mons Ida -- Mons Lyctas -- Montes Apenninus -- Montes Carpatus -- Montes Caucasus -- Montes Cordillera -- Montes Pyrenaeus -- Montes Riphaeus -- Montes Rook -- Moon -- Moon phase -- Moore, Patrick -- Mount Palomar observatory -- Mount Stromlo Observatory -- Mount Wilson Observatory -- MOXE -- Mueller, Jean -- Muliphem -- Mullard Radio Astronomy Observatory -- Multiple star -- Multiverse -- Mundilfari (moon) -- Murzim -- Musca -- Mädler, Johann Heinrich, von -- Méchain, Pierre -- Möbius, August Ferdinand -- Müller, Johannes --

N

N-body problem -- Nabu-rimanni -- Nadir -- Naiad (moon) -- Naiad (moon) -- Naive set theory -- Naked eye -- Naked singularity -- Nançay Radio Telescope -- Naos -- Napier, John -- Narrabri Stellar Intensity Interferometer -- Narvi (moon) -- NASA -- Natal chart -- National Optical Astronomy Observatories -- National Optical Astronomy Observatory -- National Radio Astronomy Observatory -- Natural satellite -- Nature (journal) -- Navigation -- Navy Prototype Optical Interferometer -- NEAR Shoemaker -- Near-Earth asteroid -- Near-Earth object -- Nebula -- Nebular hypothesis -- Nectarian -- Nectarian System -- Nemesis (star) -- Nemontemi -- Neptune -- Neptune (planet) -- Neptune's natural satellites -- Nereid (moon) -- Neutrino mass -- Neutrino oscillation -- Neutron star -- Neutronium -- Nevanlinna, Rolf -- New General Catalogue -- New Horizons -- New Technology Telescope -- New moon -- Newcomb's Tables of the Sun -- Newcomb, Simon -- Newton -- Newton's laws of motion -- Newton, Isaac -- Newtonian mechanics -- Newtonian physics -- Newtonian telescope -- Next Generation Space Telescope -- NGC 1068 -- NGC 2244 -- NGC 2264 -- NGC 3227 -- NGC 3516 -- NGC 4321 -- NGC 4486 -- NGC 4593 -- NGC 5128 -- NGC 6027 -- NGC 6171 -- NGC 6240 -- NGC 6751 -- NGC 7742 -- NGST -- Nice Observatory -- Nicholson, Seth Barnes -- Niels Bohr Institute -- Night sky -- Nikola Tesla -- Nilson, Peter -- NOAO -- Node (astronomy) -- Non-Euclidean geometry -- Non-standard cosmology -- Nordic Optical Telescope -- Norma (constellation) -- North -- North America Nebula -- North Star -- Northeastern Space Radio Observatory -- Northern Hemisphere -- Northern hemisphere -- Nova -- Novara da Ferrara, Domenico Maria -- Novikov, Igor Dmitrievich -- Novikov, Petr Sergeevich -- Nuclear Spectroscopic Telescope Array -- Nucleocosmochronology -- Nucleosynthesis -- Nutation --

O

O-type asteroid -- Oak Ridge Observatory -- Oberon (moon) -- Oberth, Hermann Julius -- Oblateness -- Obliquity of the ecliptic -- Obruchev (crater) -- Observation -- Observatory -- Observatorio del Teide -- Observatory of Strasbourg Talk:Observatory of Strasbourg -- Occultation -- Oceanus Procellarum -- Octans -- Odysseus crater -- OGS Telescope -- OH maser -- Olbers' paradox -- Olbers, Heinrich Wilhelm Matthäus -- Ole Rømer -- Oliver Heaviside -- Olympus Mons -- Omar Khayyám -- Omega Centauri -- Omniverse -- One-Mile Telescope -- Onsala Space Observatory Talk:Onsala Space Observatory -- Oort cloud -- Oort, Jan -- Ooty Radio Telescope -- Open cluster -- Ophelia -- Ophelia (moon) -- Ophiuchus -- Oppenheimer-Volkoff limit -- Opposition (astronomy) -- Optical astronomy -- Optical axis -- Optical binary -- Optical depth -- Optical double -- Optical interferometry -- Optical telescope -- Optical window -- Orbit -- Orbital elements -- Orbital period -- Orbital plane (astronomy) -- Orbital resonance -- Orbital revolution -- Orbital speed -- Orbiting Astronomical Observatory -- Origin of life -- Origin of lunar nomenclature -- Orion -- Orion Nebula -- Orrery -- Oscillatory universe -- Osservatorio Astrofisico di Arcetri -- Osservatorio Astrometrico Santa Lucia Stroncone -- Outer Rook Mountains -- Outer space -- Overwhelmingly Large Telescope -- Owens Valley Radio Observatory -- Owl Nebula --

P

P-process -- P-type asteroid -- Paaliaq (moon) -- Palermo Technical Impact Hazard Scale -- Palimpsest -- Palisa, Johann -- Pallasite -- Pallene (moon) -- Palomar Observatory -- Palomar Observatory Sky Survey -- Palomar Testbed Interferometer -- Pan (moon) -- Pandora (moon) -- Panspermia -- Panzano Observatory -- Parabolic mirror -- Parabolic reflector -- Parallax -- Parallel universe -- Paranal Observatory -- Paris Observatory -- Parkes Observatory -- Parsec -- Parsons, William -- Particle horizon -- Pasiphaë (moon) -- Pasiphaë group -- Pasiphaë (moon) -- Paul Wild (Swiss astronomer) -- Paul Wild Observatory -- Pauli exclusion principle -- Pavo (constellation) -- Payne-Gaposchkin, Cecilia -- PBS -- Pegasus -- Pegasus (constellation) -- Peirce (crater) -- Penrose, Roger -- Penumbra -- Periapsis -- Periastron -- Perigee -- Perihelion -- Perrine, Charles Dillon -- Perseids -- Perseus (constellation) -- Perseus Cluster -- Phecda -- Philosophiae Naturalis Principia Mathematica -- Phobos (moon) -- Phoebe (moon) -- Phoenix (constellation) -- Photographic plate -- Photometry -- Photosphere -- Physical Cosmology -- Physical cosmology -- Piazzi Smyth, Charles -- Piazzi, Giuseppe -- Picard crater -- Pickering, Edward -- Pickering, William Henry -- Pictor -- Pierre Auger Observatory -- Pierre Méchain -- Pieter Dirkszoon Keyser -- Pinwheel Galaxy -- Pioneer 10 -- Pioneer 11 -- Pisces -- Piscis Austrinus -- Piwnice radio observatory -- Planck Surveyor -- Planck units -- Planck's law of black body radiation -- Planck, Max -- Planet -- Planet X -- Planetarium -- Planetary Hypothesis -- Planetary motion -- Planetary nebula -- Planetary nomenclature -- Planetary orbit -- Planetary phase -- Planetary ring -- Planetary science -- Planetary system -- Planetesimal -- Planetoid -- Planetology -- Planets -- Planisphaerium -- Plasma cosmology -- Plato -- Pleiades -- Plekhnaton -- Plutino -- Pluto -- Pluto (planet) -- Pogson, Norman Robert -- Poincaré group -- Poincaré, Henri -- Poisson, Siméon-Denis -- Polar Aurora -- Polar aurora -- Polar coordinate system -- Polar coordinates -- Polar distance -- Polarimetry -- Polaris -- Polarization -- Polarized light -- Pole -- Pollux -- Polydeuces (moon) -- Pond, John -- Pons, Jean-Louis -- Population II -- Porrima (star) -- Portia (moon) -- Posidonius -- Positional astronomy -- Potočnik, Herman -- Potsdam Observatory -- Pre-Nectarian -- Precession -- Priestley, Joseph -- Primary mirror -- Prime Meridian -- Prime meridian -- Primordial black hole -- Primordial material -- Principle of relativity -- Prism (optics) -- Procellarum basin -- Procyon -- Procyon A -- Procyon B -- Prograde and retrograde motion -- Prograde orbit -- Prometheus (moon) -- Promonitorium Agarum -- Pronunciation of asteroid names -- Proper Motion -- Proper motion -- Proper motion distance -- Proper time -- Proplyd -- Prosen, Marjan Majo -- Prospero (moon) -- Proteus (moon) -- Proto-star -- Proton-antiproton imbalance -- Proton-proton chain -- Protoplanetary disc -- Protoplanetary disk -- Protostar -- Protostellar disk -- Provisional designation -- Proxima Centauri -- Prussian tables -- Prutenicae Tabulae -- PSR 1257 plus 12 -- PSR B1620-26 -- PSR B1620-26c -- Ptolemaic system -- Ptolemy -- Ptolemy Cluster -- Puck (moon) -- Pulsar -- Pupil -- Puppis -- Pythagoras -- Pyxis --

Q

Q-type asteroid -- Quadrant -- Quadrivium -- Quantum gravity -- Quaoar -- Quark-antiquark epoch -- Quark-gluon plasma -- Quasar -- Quasars, Redshifts and Controversies -- Queloz, Didier -- Quetelet, Lambert Adolphe Jacques -- Quintessence -- Quintessence (physics) --

R

R-process -- R-type asteroid -- R. Paul Butler -- Radial velocity -- Radian -- Radiant -- Radiation pressure -- Radio astronomy -- Radio galaxy -- Radio star -- Radio telescope -- Radio telescopes -- Radio window -- Ranzinger, Pavla -- Rare Earth hypothesis -- Ras Algethi -- RATAN-600 -- Rayleigh scattering -- Reber, Grote -- Red clump -- Red dwarf -- Red dwarf star -- Red giant -- Redshift -- Rees, Martin -- Reference frame -- Reflecting telescope -- Reflection nebula -- Reflector telescope -- Refracting telescope -- Refractor telescope -- Regiomontanus -- Regolith -- Regulus -- Reinhold, Erasmus -- Reitsema, Harold -- Relativistic jet -- Research Consortium on Nearby Stars -- Resolution (optics) -- Resolving power -- Reticulum -- Retrogade orbit -- Retrogradation -- Retrograde motion -- Revised Julian calendar -- Reynolds, Alastair -- Rhea (moon) -- Rheticus, Georg Joachim -- Rho Coronae Borealis -- Rhyolite -- Riemannian geometry -- Rigel -- Right Ascension -- Right ascension -- Rijl al Awwa -- Rima Sirsalis -- Ring Nebula -- Ring current -- Ring galaxy -- Rings of Saturn -- Ritchey, George Willis -- Ritchey-Chrétien telescope -- Robert Burnham, Jr. -- Robert G. Harrington -- Robert Hooke -- Robert Oppenheimer -- Robert Woodrow Wilson -- Robotic telescope -- Roche limit -- Roche lobe -- Roche, Édouard Albert -- Rocket -- Roque de los Muchachos Observatory -- Rosalind (moon) -- ROSAT -- Rosette Nebula -- Ross 128 -- Ross 154 -- Ross 248 -- Rossi X-ray Timing Explorer -- Rotation period -- Royal Astronomical Society -- Royal Greenwich Observatory -- Royal Observatory, Edinburgh -- RR Lyrae -- RR Lyrae variable -- Rubin, Vera -- Rudbeckius, Olaus -- Russell, Henry Norris -- Ryle Telescope -- Ryle, Martin -- Rømer, Ole --

S

S-process -- S-type asteroid -- S/1986 U 10 -- S/2001 U 2 -- S/2001 U 3 -- S/2002 N 1 -- S/2002 N 2 -- S/2002 N 3 -- S/2002 N 4 -- S/2003 J 12 -- S/2003 J 2 -- S/2003 N 1 -- S/2003 U 1 -- S/2003 U 2 -- S/2003 U 3 -- S/2004 S 10 -- S/2004 S 11 -- S/2004 S 12 -- S/2004 S 13 -- S/2004 S 14 -- S/2004 S 15 -- S/2004 S 16 -- S/2004 S 17 -- S/2004 S 18 -- S/2004 S 3 -- S/2004 S 4 -- S/2004 S 6 -- S/2004 S 7 -- S/2004 S 8 -- S/2004 S 9 -- Sabine, Edward -- Sagan, Carl -- Sagitta -- Sagittarius -- Sagittarius A -- Sagittarius Dwarf Elliptical Galaxy -- Saiph -- Samuel Oschin telescope -- Sandage, Allan -- Sanskrit -- Saros -- Satellite -- Saturn -- Saturn (planet) -- Saturn Nebula -- Saturn's natural satellites -- Savile, Henry -- Savilian chair of astronomy -- Scattered disc -- Scheiner, Christoph -- Schmidt camera -- Schmidt corrector plate -- Schmidt survey -- Schmidt, Bernard -- Schmidt, Bernhard -- Schmidt, Bernhard Voldomar -- Schmidt, Maarten -- Schmidt-Cassegrain -- Schmidt-Cassegrain telescope -- Schwabe, Heinrich -- Schwabe, Samuel Heinrich -- Schwarzschild metric -- Schwarzschild radius -- Schwarzschild, Karl -- Schwassmann-Wachmann-3 -- Science (journal) -- Scintillation (astronomy) -- Scorpius -- Sculptor (constellation) -- Sculptor Group -- Scutum -- Second Superstring Revolution -- Second of arc -- Secondary mirror -- Seeing -- Semi-major axis -- Semidetached binary -- Semimajor axis -- Semiregular variable -- Serpens -- Serrurier trusses -- Setebos (moon) -- Setebos (moon) -- SETI -- Setting circle -- Setting circles -- Sextans -- Sextant -- Seyfert galaxy -- Seyfert's Sextet -- Seyfert, Carl Keenan -- Shape of the universe -- Shapley, Harlow -- Shaula -- Shedir -- Shepherd satellite -- Shklovsky, Iosif Samuilovich -- Shoemaker, Carolyn -- Shoemaker, Eugene -- Short, James -- Siarnaq (moon) -- Sideral day -- Sidereal astrology -- Sidereal day -- Sidereal time -- Sidereal year -- Siding Spring 2.3 m Telescope -- Siding Spring Observatory -- Sinope (moon) -- Sirius -- Sirius A -- Sirius B -- Sirona -- Sirrah -- Sirsalis (crater) -- Sitter, Willem, de -- Skathi (moon) -- Skies of other planets -- Sky -- Skylab -- Small Magellanic Cloud -- Small-angle formula -- Smith, Francis Graham -- Smithsonian Astrophysical Observatory -- Smyth, William Henry -- SN 1604 -- Snell's law -- Snell's law -- SOAR telescope -- Soft X-ray transient -- Soft gamma repeater -- Solar System -- Solar activity -- Solar and Heliospheric Observatory -- Solar calendar -- Solar cosmic ray -- Solar cycle -- Solar day -- Solar eclipse -- Solar flare -- Solar luminosity -- Solar mass -- Solar maximum -- Solar nebula -- Solar neutrino problem -- Solar prominence -- Solar radiation -- Solar sail -- Solar system -- Solar time -- Solar variation -- Solar wind -- Solar year -- Solstice -- Sombrero Galaxy -- Sonneberg Observatory -- Sothic cycle -- South -- South Pole Telescope -- South Pole-Aitken basin -- South pole -- Southern African Large Telescope -- Southern Hemisphere -- Southern Pinwheel Galaxy -- Southern hemisphere -- Space -- Space Interferometry Mission -- Space Race -- Space Shuttle -- Space Shuttle Atlantis -- Space Shuttle Columbia -- Space Shuttle Discovery -- Space Shuttle Endeavour -- Space Telescope Science Institute -- Space exploration -- Space observatory -- Space probe -- Space science -- Space station -- Space telescope -- Space weather -- Space-time -- Spacecraft -- Spacetime -- Spacewatch -- Specific orbital energy -- Speckle imaging -- Spectral class -- Spectral classification -- Spectral density -- Spectral line -- Spectral type -- Spectrograph -- Spectroheliograph -- Spectrometer -- Spectrometry -- Spectroscope -- Spectroscopic binary -- Spectroscopy -- Spectrum-X-Gamma -- Speed of gravity -- Speed of light -- Spherical aberration -- Spica -- Spiral arm -- Spiral galaxy -- Spitzer Space Telescope -- Spoerer law -- Sporus of Nicaea -- Spotting scope -- Sputnik 1 -- Stable isotope -- Standard Model -- Standard candle -- Standard gravitational parameter -- Standard model -- Star -- Star catalogue -- Star cluster -- Star designation -- Star formation -- Star party -- Star system -- Starburst galaxy -- Starbust galaxy -- Starfish galaxy -- Starlink Project -- Stars -- Steady state theory -- Stellar association -- Stellar astronomy -- Stellar classification -- Stellar dynamics -- Stellar evolution -- Stellar nucleosynthesis -- Stellar nursery -- Stellar population -- Stellar wind -- Stephano (moon) -- Stephen P. Synnott -- Steven Weinberg -- Stevin, Simon -- Steward Observatory -- Stratosphere -- String theory -- Strnad, Janez -- Strong interaction -- Strong nuclear force -- STScI -- Subaru (telescope) -- Subcluster -- Subdwarf -- Submillimeter Array -- Submillimetre astronomy -- Substellar -- Sudbury Neutrino Observatory -- Summer Solstice -- Summer solstice -- Sun -- Sun dog -- Sundial -- Sunflower Galaxy -- Sunlight -- Sunrise -- Sunset -- Sunspot -- Sunspot Index -- Sunyaev-Zel'dovich Array -- Sunyaev-Zel'dovic-Effect -- Sunyaev-Zel'dovich Array -- Sunyaev-Zeldovich effect -- Super jupiter -- Super-Kamiokande -- SuperWASP -- Supercluster -- Supergiant -- Supergravity -- Superior planet -- Superluminal motion -- Supermassive black hole -- Supernova -- Supernova 1604 -- Supernova 1987a -- Supernova nucleosynthesis -- Supernova remnant -- Superstring theory -- Supersymmetry -- Surface brightness -- Suttungr (moon) -- Swedish Solar Telescope -- Swift Gamma-Ray Burst Mission -- Sycorax (moon) -- Symbols, astronomical -- Synchronous rotation -- Synchrotron radiation -- Synodic day -- Synodic month -- Synodic period -- Syrma -- Syzygy -- Szymanski, Michal --

T

T Tauri star -- T Tauri stars -- T-type asteroid -- Taikonaut -- Takeuchi, Naoko -- Tarantula Nebula -- Tarvos (moon) -- Tau Ceti -- Taurus -- Teegarden's star -- Tektite -- Telescope -- Telescope making -- Telescope mount -- Telescopio Carlos Sánchez -- Telescopio Nazionale Galileo -- Telescopium -- Telesto (moon) -- Terminator -- Terrae -- Terraforming -- Terrestrial Planet Finder -- Terrestrial Time -- Terrestrial planet -- Tethys (moon) -- Thabit ibn Qurra -- Thalassa (moon) -- Thales -- The Big Ear -- Thebe (moon) -- Themis (moon) -- Themisto (moon) -- Thomas Young (scientist) -- Thompson crater -- Thompson, Christopher -- Thorne, Kip -- Thorne-Zytkow object -- Thrymr (moon) -- Thuban -- Tidal acceleration -- Tidal force -- Tidal locking -- Tidal resonance -- Tide -- Time dilation -- Timeline of artificial satellites and space probes -- Timeline of astronomical maps, catalogs, and surveys -- Timeline of black hole physics -- Timeline of cosmic microwave background astronomy -- Timeline of cosmology -- Timeline of knowledge about galaxies, clusters of galaxies, and large-scale structure -- Timeline of knowledge about galaxies, clusters of galaxies, and large-scale structure -- Timeline of knowledge about the interstellar and intergalactic medium -- Timeline of other background radiation fields -- Timeline of solar astronomy -- Timeline of solar system astronomy -- Timeline of stellar astronomy -- Timeline of telescopes, observatories, and observing technology -- Timeline of telescopes, observatories, and observing technology -- Timeline of the Big Bang -- Timeline of the Universe -- Timeline of white dwarfs, neutron stars, and supernovae -- Timeline of white dwarfs, neutron stars, and supernovae -- Timocharis -- Tip-tilt mirror -- Titan (mythology) -- Titan (moon) -- Titania (moon) -- Titius, Johann Daniel -- Titius-Bode law -- Toledan tables -- Tom Gehrels -- Tombaugh, Clyde -- Tonalamatl -- Topology of the universe -- Torino scale -- Tpoint -- TRACE -- Trans-Neptunian object -- Transit (astronomy) -- Transit of Deimos from Mars -- Transit of Earth from Mars -- Transit of Mercury -- Transit of Phobos from Mars -- Transit of Venus -- Triangulum -- Triangulum Australe -- Triangulum Galaxy -- Trifid Nebula -- Trinculo (moon) -- Triple star -- Triple-alpha process -- Triton (moon) -- Trojan asteroid -- Tropical zodiac -- Tucana -- Tully-Fisher relation -- Tunguska event -- Turbulence -- Twilight -- Twin paradox -- Twiss, Richard Q. -- Two-body problem -- Twotino -- Tycho -- Tychonian system -- Tzol'kin --


U

UBC Liquid-Mirror Observatory -- Udalski, Andrzej -- Uhuru -- UK Schmidt Telescope -- UKIRT -- Ultimate fate of the Universe -- Ultimate fate of the universe -- Ulugh Beg -- Umbra -- Umbriel (moon) -- Unidentified flying object -- Unified Theory of Active Galaxies -- United States Naval Observatory -- Universe -- Unmanned space mission -- Upper Imbrian -- Uppsala Astronomical Observatory -- Uppsala General Catalogue -- Upsilon Andromedae -- Urania -- Uraniborg -- Uranometria -- Uranus -- Uranus (planet) -- Uranus' natural satellites -- Ursa Major -- Ursa Major Moving Group -- Ursa Major moving group -- Ursa Minor -- UV astronomy --

V

V-type asteroid -- Van Allen radiation belt -- Van Allen, James -- Van Lansberg, Philip -- van Maanen, Adriaan -- Variable star -- Variable star designation -- Varuna -- Vaucouleurs, Gérard de -- Vega -- Vela (constellation) -- Venus (planet) -- Venus-crosser asteroid -- Vernal equinox -- Very Large Telescope -- Very Long Baseline Array -- Very Long Baseline Interferometry -- Very Small Array -- Vienna Observatory -- VILSPA -- Vindemiatrix -- Virgo A Galaxy -- Virgo Supercluster -- Virgo cluster -- VIRGO (physics) -- Virial theorem -- VISTA (telescope) -- Visual binary -- Visual magnitude -- VLA -- VLBI -- VLT -- VLT Survey Telescope -- VLTI -- Vogel, Hermann Carl -- Volans -- von Braun, Wernher -- von Humboldt, Alexander -- von Neumann, John -- Voyager 1 -- Voyager 2 -- Voyager program -- Vulcan -- Vulcanoid asteroid -- Vulpecula -- Väisälä, Yrjö --

W

W UMa -- W Virginis variable -- W cloud -- Walker, Richard -- Weizsäcker, Carl, von -- Wendelin, Godefroy -- Westerbork Synthesis Radio Telescope -- Weyl's postulate -- Weyl's postulate -- Weyl, Hermann Klaus Hugo -- Wezen -- Wheeler, John Archibald -- Whirlpool Galaxy -- White dwarf -- White hole -- Wien's law -- Wigner, Eugene -- Willebrord van Roijen Snell -- William McCrea (astronomer) -- William Parsons, 3rd Earl of Rosse -- Wilson effect -- WIMP -- Winter Solstice -- Winter solstice -- Wirtz, Carl Wilhelm -- Witten, Edward -- WIYN Consortium -- WMAP -- Wolf 359 -- Wolf Number -- Wolf, Max -- Wolf-Rayet star -- Wolfe -- Wolfendale, Arnold -- Wolszczan, Aleksander -- Woolley, Richard van der Riet -- Wren, Christopher --

X

X-ray astronomy -- X-ray binaries -- X-ray burster -- X-ray pulsar -- X-type asteroid -- Xaver, Franz, Baron von Zach -- Xiuhmolpilli -- XMM-Newton --

Y

Yale Bright Star Catalog -- Yarkovsky effect -- Yerkes Observatory -- Yerkes telescope -- Ymir (moon) -- YORP effect -- Young stellar object -- Young, Charles Augustus -- Yrjö Väisälä --

Z

Zaniah -- Zavijah -- Zeeman effect -- Zeeman, Pieter -- Zenith -- Zenithal hourly rate -- Zeta Boötis -- Zeta Reticuli -- Zhang Heng -- Zodiac -- Zodiacal light -- Zond 3 -- Zoroastrian calendar -- Zwicky, Fritz -- Zytkow, Anna --

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