Encyclopedia - Astronomy

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aberration of starlight active galactic nucleus (AGN) Adams, Walter S(ydney) albedo Aldrin, Edwin Eugene, Jr. Almagest Alpha Centauri altitude and azimuth Anaximander Andromeda Galaxy Apollo Arecibo Observatory Aristarchus of Samos Armstrong, Neil (Alden) asteroid astrobiology astrolabe astronaut astronomical unit (AU) astronomy

astrophysics Atlas rocket avoidance, zone of Baily's beads Barnard's star Bell Burnell, (Susan) Jocelyn Bessel, Friedrich Wilhelm Betelgeuse big bang binary star black hole Blackett (of Chelsea), Patrick M(aynard) S(tuart), Baron Bluford, Guion S(tewart), Jr. Bode's law Bowditch, Nathaniel Brahe, Tycho brown dwarf Burbidge, (Eleanor) Margaret Cassini, Gian Domenico Cassini-Huygens

Cavendish experiment celestial coordinates celestial mechanics celestial sphere Celsius, Anders Centaur object Cepheid variable Ceres Chandra X-ray Observatory Chandrasekhar, Subrahmanyan Chiron chromosphere cluster of galaxies Coalsack comet Compton Gamma Ray Observatory constellation Copernican system Copernicus, Nicolaus corona

Cosmic Background Explorer (COBE) cosmic background radiation cosmic ray cosmology Crab Nebula Cygnus A dark energy dark matter Drake equation Dresden Codex dwarf planet dwarf star Earth impact hazard Earth-crossing asteroid earthshine eclipse eclipsing variable star ecliptic Eddington, Sir Arthur Stanley Einstein's mass-energy relation

Encke's Comet ephemeris equinox equinoxes, precession of the Eratosthenes of Cyrene Eris Eros escape velocity European Space Agency (ESA ) event horizon expanding universe Explorer extrasolar planet flare star Foucault, Jean (-Bernard-Léon) Fowler, William A(lfred) Fraunhofer lines free fall Friedmann universe Gagarin, Yury (Alekseyevich)

galactic coordinate galactic halo galaxy Galilean satellite Galileo Galileo (Galilei) gamma-ray astronomy Gamow, George gegenschein Gemini giant star Giotto Glenn, John H(erschel), Jr. globular cluster gravitational radiation Great Attractor Great Red Spot Gum Nebula Hale, George E(llery) Hale-Bopp, Comet

Halley's Comet Halley, Edmond Hawking radiation Hawking, Stephen W(illiam) heliopause Herschel family Hertzsprung-Russell diagram Hess, Victor Francis Hewish, Antony Hipparchus Hipparcos Hoyle, Sir Fred Hubble Space Telescope (HST) Hubble's constant Hubble, Edwin P(owell) Hulse, Russell Alan Hyades inflation Infrared Astronomical Satellite (IRAS) infrared astronomy

Infrared Space Observatory (ISO) International Space Station (ISS) interstellar medium Jansky, Karl (Guthe) Jeans, Sir James (Hopwood) Jemison, Mae (Carol) Jupiter Kepler, Johannes Kirkwood gaps Komarov, Vladimir (Mikhaylovich) Krikalyov, Sergey Konstantinovich Kuiper belt Landsat Langley, Samuel (Pierpont) Lemaître, Georges Leonov, Aleksey (Arkhipovich) light-year limb darkening Local Group Lorentz transformations

Lorentz-FitzGerald contraction Lovell, Sir (Alfred Charles) Bernard Lowell, Percival Lucid, Shannon Wells Luna Mach's principle Maffei I and II Magellanic Cloud magnetosphere magnitude mare Mariner Mars Mars Pathfinder Mars, canals of Mercury Mercury Messier catalog meteor meteor shower

meteorite Milky Way Galaxy Mir Missile Defense Alarm System (Midas) Moon Mount Wilson Observatory NASA nebula Neptune neutrino problem, solar neutron star Newton's law of gravitation nova observatory Ochoa, Ellen Olbers's paradox Olympus Mons Omega Centauri Oort cloud open cluster

Orion Nebula Ozma, Project ozone layer Palomar Observatory parallax parsec Penzias, Arno (Allan) photometry photosphere Pioneer planet planetarium planetary nebula planetesimal Pleiades Pluto Polaris Polyakov, Valery Vladimirovich Populations I and II proper motion

Ptolemy pulsar quasar radio and radar astronomy Ranger redshift retrograde motion Ride, Sally (Kristen) Roche limit Royal Greenwich Observatory Ryle, Sir Martin Sagan, Carl (Edward) Sagittarius A Salyut satellite Saturn Saturn Schwarzschild radius Schwarzschild, Karl SETI

Shapley, Harlow Shenzhou Shepard, Alan B(artlett), Jr. Shoemaker-Levy 9 sidereal period Sirius Skylab solar cycle solar flare solar nebula solar prominence solar system solar wind solstice Soyuz space exploration space shuttle space station spacecraft Sputnik

star steady-state theory string theory Struve, Friedrich Georg Wilhelm von Struve, Otto Sun sunspot supergiant star supernova Surveyor synodic period T Tauri star Taylor, Joseph H(ooton), Jr. telescope Tereshkova, Valentina (Vladimirovna) Thor rocket time dilation Titan Titan rocket Triton

Trojan asteroids Tunguska event ultraviolet astronomy unidentified flying object (UFO) universe Uranus V-2 missile Van Allen radiation belts Vanguard variable star Velikovsky, Immanuel Venera Venus Very Large Array (VLA) Viking Virgo cluster Vostok Voyager Vulcan white dwarf star

Wilson, Robert W(oodrow) X-ray astronomy zodiac zodiacal light Zwicky, Fritz