Related by context. Frequent words. (Click for all words.) 68 HD #b [002] 68 UB# [003] 66 dwarf planet 65 brown dwarf 65 exoplanet 64 Sedna 64 super Earths 63 planet orbiting 63 dwarf planets 63 extrasolar planet 63 brown dwarfs 62 asteroid 62 distant galaxy 62 rocky planets 62 extrasolar planets 61 supernova explosion 61 Eta Carinae 60 Pluto 60 galaxy cluster 60 planets 60 exoplanets 60 hot Jupiters 60 dwarf galaxy 59 Betelgeuse 59 infrared telescope 58 Milky Way Galaxy 58 terrestrial planets 58 Orion Nebula 58 gamma ray burst 58 planets orbiting 58 Kuiper Belt 57 elliptical galaxies 57 asteroids 57 globular clusters 57 GRBs 57 moon Titan 56 Uranus 56 quasar 56 galaxy 56 supernova 56 Milky Way galaxy 56 Gliese 56 planetary 55 orbits 55 supernova explosions 55 spiral galaxy 55 ringed planet 55 comet 55 quasars 55 Saturn moons 55 moons 54 Milky Way 54 outer planets 54 Saturn rings 54 dwarf galaxies 54 astronomers 54 Jupiter moons 54 X ray emission 54 XMM Newton 54 comet nucleus 54 asteroid belt 54 nebula 54 neutron star 54 galaxy clusters 54 supernovae 53 galaxies 53 redshift 53 Lutetia 53 comets 53 Solar System 53 elliptical orbit 53 spiral galaxies 53 martian 53 cosmic ray 53 occultation 53 Comet Tempel 1 53 circular orbit 53 Saturn moon 53 galactic 52 ejecta 52 orbiting telescope 52 pulsar 52 Iapetus 52 nebulae 52 Halley Comet 52 orbiting 52 Jupiter Saturn Uranus 52 Earth asteroids 52 robotic spacecraft 52 interstellar dust 52 geologically active 51 perigee 51 cometary 51 fainter 51 optical telescopes 51 Apophis 51 Large Magellanic Cloud 51 sunspot 51 habitable zone 51 Spitzer Space Telescope 51 Enceladus