Related by context. Frequent words. (Click for all words.) 62 Tycho Brahe 56 Paul Dirac 54 Edwin Hubble 52 Roger Penrose 51 Astrophysicist 50 planet Uranus 49 heliocentric 49 Halley comet 49 Johannes Kepler 49 Phaethon 49 Nicolaus Copernicus 49 Einstein 49 Galileo Galilei 48 Richard Feynman 48 Mauna Kea Hawaii 48 interplanetary spacecraft 48 Astronomer Royal 47 STScI 47 Fourier 47 Charles Babbage 47 geocentric 47 Niels Bohr 47 Wilkinson Microwave Anisotropy Probe 47 Haumea 47 Andromeda galaxy 47 Voyager spacecraft 47 Astronomer 46 photometry 46 astronomical telescope 46 Carl Sagan 46 Gehrels 46 Eagle Nebula 46 Albert Einstein 46 Mathematician 46 R. Buckminster Fuller 46 Einstein theories 45 Feynman 45 galaxy NGC 45 Viking landers 45 Frank Borman 45 Guglielmo Marconi 45 Lovis 45 Fresnel 45 Professor Stephen Hawking 45 Pythagoras 45 Consolmagno 45 Exoplanet 45 astronomer 44 Galilei 44 Galaxy Evolution 44 A. Heinlein 44 Archimedes 44 Diviner 44 Gregor Mendel 44 Corot 44 Mars Pathfinder 44 COROT 44 Galileo spacecraft 44 Zwicky 44 Compton Gamma Ray 44 Blaise Pascal 44 Crab Nebula 44 Philae 44 Venusian 44 Lavoisier 44 radial velocity 44 extrasolar 43 X ray telescopes 43 Copernicus 43 NASA Cassini 43 Arecibo Observatory 43 Mandelbrot 43 Asteroid 43 NASA Stardust spacecraft 43 Claude Levi Strauss 43 Ferdinand Magellan 43 Halley Comet 43 Flyby 43 Keck telescope 43 meteoroid 43 CoRoT 43 Lutetia 43 God Particle 43 Leonardo DaVinci 43 mathematician 43 Thor Heyerdahl 43 CfA 43 HAT P 43 Isaac Newton 43 Thomas Malthus 43 Galileo telescope 43 constellation Sagittarius 43 Laplace 42 Sedna 42 Algol 42 SIRTF 42 distant galaxy 42 Ptolemy 42 Nibiru 42 Brahe 42 cosmonaut Yuri Gagarin