Related by context. Frequent words. (Click for all words.) 60 asteroids 58 super Earths 57 planet orbits 57 asteroid belt 57 Kuiper belt 56 orbiting 56 galaxy cluster 56 planets orbiting 56 Cancri 56 moon Charon 56 Milky Way Galaxy 56 meteoroid 56 orbits 56 Andromeda galaxy 55 Kuiper Belt 55 Earth asteroids 55 asteroid 55 interplanetary spacecraft 55 planet orbiting 54 moon Titan 54 Titan Saturn 54 rocky planets 54 galaxy clusters 54 planets 54 orbiting Saturn 54 Saturn rings 53 Earth magnetosphere 53 moons 53 Saturn moons 53 dwarf galaxy 53 globular clusters 53 Milky Way galaxy 53 Eta Carinae 53 celestial object 53 globular cluster 52 microlensing 52 volcanically active 52 magnetosphere 52 comet 52 Spitzer Space Telescope 52 supernova explosion 52 solar nebula 52 supernova remnant 52 comets 52 Gliese #g 52 astronomers 52 dwarf galaxies 52 planetary nebula 52 comet nucleus 52 Comet Tempel 1 51 supercontinent 51 quasar 51 terrestrial planets 51 outer planets 51 meteoroids 51 HD #b [002] 51 extrasolar planet 51 Fomalhaut 51 New Horizons spacecraft 51 distant galaxy 51 Andromeda Galaxy 51 Large Magellanic Cloud 51 optical telescopes 51 extrasolar planets 51 nebula 51 Cabeus crater 51 observable universe 51 Astronomers 51 GeV 50 COROT 50 Haumea 50 substorms 50 supernova explosions 50 Orion Nebula 50 Milky Way 50 elliptical galaxies 50 cometary 50 distant galaxies 50 Jupiter moons 50 comet Wild 50 optical telescope 50 habitable planets 50 Mimas 50 galaxies 50 spacecraft orbiting 50 NASA Kepler 49 X ray emission 49 orbited 49 ringed planet 49 Saturn moon 49 solar flares 49 Gamma ray bursts 49 planetoid 49 exoplanets 49 neutron star 49 spiral galaxies 49 lunar soil 49 ionized gas 49 habitable planet 49 ejecta 49 dwarf planet