Related by context. Frequent words. (Click for all words.) 66 dwarf planets 64 dwarf planet 62 UB# [003] 61 Gliese #g 61 Pluto 61 Haumea 59 Kuiper belt 59 Sedna 58 HD #b [002] 58 star Gliese 58 WASP #b 58 planets 57 super Earths 57 planetoid 56 Jupiter Saturn 56 outer planets 56 moon Charon 55 magnetars 55 exoplanets 55 Oort Cloud 55 hot Jupiters 55 extrasolar planets 55 Cancri 55 Jupiter Saturn Uranus 54 terrestrial planets 54 planet orbits 54 exoplanet 54 Kuiper Belt 54 brown dwarfs 53 COROT 53 interplanetary spacecraft 53 planetary nebulae 53 NASA Kepler 53 Uranus 53 R#a# 53 habitable zones 53 Milky Way Galaxy 53 brown dwarf 53 extrasolar planet 52 dwarf galaxies 52 celestial bodies 52 habitable planet 52 JPL manages 52 asteroid 52 orbits 52 rocky planets 52 asteroids 52 planets orbiting 51 Cabeus crater 51 Gliese 51 Phaethon 51 innermost planet 51 habitable planets 51 globular cluster 51 Saturn rings 51 orbiting 51 microlensing 51 moon Europa 51 planetary 51 Ophiuchus 51 OGLE 51 astronomers 51 planet orbiting 50 Lutetia 50 Earth magnetosphere 50 galactic 50 Saturn moon 50 magnetar 50 Solar System 50 planets circling 50 constellation Perseus 50 Andromeda Galaxy 50 globular clusters 50 constellation Leo 50 planetary nebula 49 dwarf galaxy 49 asteroid belt 49 NEOs 49 active galactic nuclei 49 distant galaxy 49 EPOXI 49 radial velocity 49 International Astronomical 49 Gamma ray bursts 49 Mauna Kea Hawaii 49 STScI 49 Andromeda galaxy 49 spacecraft orbiting 49 Voyager spacecraft 49 Charon 49 moons 49 Galaxy Evolution 49 spacetime 48 Venusian 48 comet nucleus 48 NASA Cassini 48 Eris 48 meteoroid 48 meteoroids 48 Orbiting 48 heliosphere