Related by context. Frequent words. (Click for all words.) 62 extrasolar planet 61 extrasolar planets 60 exoplanet 59 moon Titan 58 HD #b [002] 58 planets 58 planet orbiting 58 planets orbiting 58 outer planets 57 ringed planet 57 moons 57 asteroid 57 exoplanets 56 Jupiter Saturn Uranus 56 NASA Cassini spacecraft 56 asteroids 56 comet 55 rocky planets 55 dwarf planet 55 Saturn moons 54 Saturn moon 54 brown dwarf 54 Milky Way Galaxy 54 astronomers 54 Cassini 54 unaided eye 54 Spitzer Space Telescope 54 XMM Newton 53 Saturn rings 53 dwarf planets 53 Milky Way galaxy 53 THEMIS 53 MESSENGER 53 orbits 53 orbiting 53 Cassini spacecraft 53 Cassini orbiter 53 NASA Mars Reconnaissance 53 flyby 52 cometary 52 Pluto 52 optical telescopes 52 Mars Reconnaissance Orbiter 52 Enceladus 52 interstellar dust 52 galaxy cluster 52 Sedna 52 celestial bodies 52 comets 52 moon Europa 51 gamma ray burst 51 celestial objects 51 elliptical galaxies 51 orbiting spacecraft 51 Kuiper Belt 51 terrestrial planets 50 distant galaxy 50 magnetosphere 50 infrared wavelengths 50 Martian surface 50 Solar System 50 brown dwarfs 50 globular clusters 50 heliosphere 50 spacecraft 49 Iapetus 49 quasars 49 optical telescope 49 galaxy clusters 49 Hubble telescope 49 impactor 49 comet Wild 49 pulsar 49 telescopes 49 distant galaxies 49 fainter 49 galaxies 49 UB# [003] 49 Phobos 48 asteroid belt 48 Uranus 48 comet dust 48 dust devils 48 Lunar Reconnaissance Orbiter 48 HiRISE 48 nebulae 48 Earth asteroids 48 robotic spacecraft 48 Tempel 1 48 galaxy 48 LCROSS 48 polar regions 48 panoramic camera 48 Itokawa 48 Victoria Crater 48 Hubble Space Telescope 48 IceCube 48 NASA Chandra 48 ejecta 48 telescope 48 Very Large Telescope