Related by context. Frequent words. (Click for all words.) 61 Nicolaus Copernicus 59 Johannes Kepler 58 Niels Bohr 58 Brahe 55 Galileo Galilei 53 Werner Heisenberg 52 planet Uranus 52 Halley comet 52 Gregor Mendel 52 Aleister Crowley 51 R. Buckminster Fuller 51 Viking landers 51 Goce 51 Paul Dirac 51 Nibiru 51 WG Sebald 51 Richard Feynman 51 Copernicus 51 SIRTF 51 Phaethon 51 Crab Nebula 51 Galileo spacecraft 50 Antikythera Mechanism 50 Galilei 50 Niels Bohr Institute 50 astronomer 50 Carl Sagan 50 planetary nebula 50 boson 50 Rene Descartes 50 COROT 50 Leonardo DaVinci 50 astronomer Carl Sagan 50 Southern Observatory ESO 49 radial velocity 49 HG Wells 49 Venusian 49 philologist 49 planetary nebulae 49 interplanetary spacecraft 49 Einstein theories 49 WASP #b 49 God Particle 49 Cassini Huygens 49 cometary 49 Consolmagno 49 Flyby 49 Edwin Hubble 48 cosmonaut Yuri Gagarin 48 Comet Tempel 1 48 astronomers 48 Astrophysicist 48 galaxy NGC 48 Mars Pathfinder 48 planetoid 48 STScI 48 Charles Babbage 48 Galaxy Evolution 48 anatomists 48 Albrecht Dürer 48 OGLE 47 Hubble Telescope 47 Saturn rings 47 Voyager spacecraft 47 Eagle Nebula 47 Isaac Newton 47 Paracelsus 47 Oort Cloud 47 NASA Cassini 47 SMOS 47 Madame Curie 47 Sigmund Freud 47 Ptolemy 47 cosmic 47 camera obscura 47 microlensing 47 comet tail 47 outer planets 47 Halley Comet 47 astronomical observatory 47 Pierre Curie 47 Telepathy 46 physicist Albert Einstein 46 astronomical observations 46 Frank Borman 46 Higgs Boson 46 Lunar Prospector 46 Andromeda Galaxy 46 Heisenberg 46 Ptolemaic 46 Blaise Pascal 46 XMM Newton 46 classical antiquity 46 Martin Buber 46 comet Wild 46 interstellar dust 46 JRR Tolkein 46 Compton Gamma Ray 46 CALIPSO 46 Lavoisier 46 European Synchrotron Radiation