Related by context. Frequent words. (Click for all words.) 68 Andromeda galaxy 65 Andromeda Galaxy 59 Large Magellanic Cloud 57 planet orbiting 55 dwarf galaxy 54 Milky Way galaxy 54 Milky Way Galaxy 54 Milky Way 54 Eta Carinae 53 spiral galaxy 52 planets orbiting 52 distant galaxy 51 rocky planets 50 spiral galaxies 50 neutron star 50 galaxies 50 galaxy cluster 49 globular cluster 49 galaxy 49 dwarf galaxies 49 supernova explosion 48 distant galaxies 48 habitable planet 48 Andromeda 48 Orion Nebula 48 fainter 48 hot Jupiters 47 quasar 47 gravitational tug 47 terrestrial planets 47 galactic 47 Gliese 47 Betelgeuse 47 orbiting 47 planets 47 celestial object 47 Alpha Centauri 47 pulsar 46 brown dwarf 46 extrasolar planet 46 HD #b [002] 46 supernova remnant 46 galaxy clusters 46 nebula 46 elliptical galaxies 45 globular clusters 45 Uranus 45 Solar System 45 orbits 45 neutron stars 45 Saturn moons 45 gravitationally 44 neighbor 44 super Earths 44 supermassive black hole 44 brown dwarfs 44 magnetar 44 supermassive black holes 44 constellation Leo 44 moons 44 moon Titan 44 comet nucleus 43 exoplanets 43 nebulae 43 comet 43 heliosphere 43 asteroid belt 43 supernovae 43 Spitzer Space Telescope 43 outer planets 43 Saturn rings 43 gamma ray burst 43 quasars 43 meteoroid 43 Phobos 43 accreting 42 Sedna 42 supernova explosions 42 Cassiopeia 42 Iapetus 42 ringed planet 42 GRBs 42 asteroids 42 unaided eye 42 planet 41 X ray emission 41 supernova 41 Kuiper Belt 41 Pleiades 41 rover Opportunity 41 suns 41 exoplanet 41 ejecta 40 Scorpius 40 cosmic 40 comets 40 craters 40 Regulus 40 Earth magnetosphere 40 planetary 40 Charon