Related by context. Frequent words. (Click for all words.) 67 HD #b [002] 66 extrasolar planet 63 brown dwarfs 63 exoplanet 63 planet orbiting 62 rocky planets 62 Gliese 62 brown dwarf 61 super Earths 60 planets orbiting 60 planets 60 distant galaxy 59 exoplanets 59 terrestrial planets 58 galaxy cluster 58 extrasolar planets 57 Eta Carinae 57 GRBs 57 elliptical galaxies 57 Orion Nebula 57 globular clusters 56 supernova explosion 56 gamma ray burst 56 planetary 56 orbiting 56 pulsar 56 redshift 55 Milky Way Galaxy 55 Lutetia 55 Betelgeuse 55 asteroid 54 fainter 54 Enceladus 54 habitable zone 54 Large Magellanic Cloud 54 quasar 54 pulsars 54 neutron star 53 Sedna 53 comet nucleus 53 gamma ray bursts 53 moon Europa 53 Milky Way galaxy 53 optical telescopes 53 dwarf galaxy 53 galaxies 53 dwarf galaxies 53 neutrino 53 quasars 53 Saturn moons 52 astrophysicists 52 supernovae 52 Saturn moon 52 Spitzer Space Telescope 52 rover Opportunity 52 neutron stars 51 UB# [003] 51 neutrinos 51 Alpha Centauri 51 distant galaxies 51 astronomers 51 Milky Way 51 orbits 51 XMM Newton 51 equatorial regions 50 Earth asteroids 50 WMAP 50 supernova 50 Solar System 50 comet 50 Earth 50 Martian surface 50 supernovas 50 astrophysical 50 planet 50 supernova explosions 50 outer planets 50 Martian 50 Red Planet 49 asteroids 49 spiral galaxy 49 celestial bodies 49 orbiting spacecraft 49 unaided eye 49 geologically active 49 extraterrestrial 49 cosmic ray 49 Kepler 49 ejecta 49 martian 49 galaxy clusters 49 celestial objects 49 comets 49 galaxy 48 supermassive black hole 48 Cassini spacecraft 48 Itokawa 48 Mars 48 gravitationally 48 interstellar dust 48 cometary