Related by context. Frequent words. (Click for all words.) 74 Gliese #g 69 HD #b [002] 69 extrasolar planet 67 planet orbiting 65 exoplanet 63 Kuiper belt 63 super Earths 63 distant galaxy 63 Sedna 62 habitable planet 62 rocky planets 62 magnetar 62 extrasolar planets 62 moon Charon 62 brown dwarf 61 Saturn moons 61 supernova explosion 61 Saturn moon 61 exoplanets 61 celestial object 61 volcanically active 61 planets 60 moon Titan 60 COROT 60 planet 60 Orion Nebula 60 Crab Nebula 60 planets orbiting 60 galaxy cluster 60 UB# [003] 60 habitable planets 59 Jupiter moons 59 astronomers 59 Milky Way Galaxy 59 Andromeda galaxy 59 Eta Carinae 59 Opportunity rover 59 comet 59 gamma ray burst 59 brown dwarfs 59 asteroid 59 Gliese 58 ringed planet 58 comet nucleus 58 Spitzer Space Telescope 58 Saturn moon Enceladus 58 Kuiper Belt 58 X ray emission 58 Cassini Huygens 58 NASA Cassini spacecraft 58 hot Jupiters 58 Uranus 58 quark gluon plasma 58 dwarf planet 57 terrestrial planets 57 Andromeda Galaxy 57 Iapetus 57 Enceladus 57 cometary 57 polar caps 57 Saturn rings 57 elliptical galaxies 57 Milky Way galaxy 57 Fomalhaut 57 outer planets 57 XMM Newton 57 constellation Leo 57 meteoroid 57 quasar 57 planetary 57 ejecta 56 Betelgeuse 56 OGLE 56 globular cluster 56 interstellar dust 56 neutron star 56 NASA Kepler 56 supernova 56 Earth magnetosphere 56 geologically active 56 martian 56 astrophysical 56 Lutetia 55 X ray Observatory 55 astrophysicists 55 Milky Way 55 Large Magellanic Cloud 55 accretion disk 55 dwarf galaxy 55 Phobos 55 Martian arctic 55 rover Opportunity 55 distant galaxies 55 astronomical objects 55 supermassive black hole 55 supernova explosions 55 Astronomers 55 Itokawa 55 neutrino 55 journal Astronomy 55 New Horizons spacecraft