Related by context. Frequent words. (Click for all words.) 58 Spica 56 Betelgeuse 56 Arcturus 53 Milky Way Galaxy 53 Pleiades 53 constellation 52 Ophiuchus 51 galactic 51 Cassiopeia 50 galaxy 50 Orion Nebula 50 distant galaxy 49 Eta Carinae 49 constellations 49 spiral galaxy 49 Alpha Centauri 49 nebula 49 Uranus 49 Nebula 49 Pollux 48 Andromeda 48 Ursa Major 47 nebulae 47 outer planets 47 ringed planet 46 occultation 46 perigee 46 starship 46 Phobos 46 dwarf galaxy 45 unaided eye 45 Sedna 45 extrasolar planet 45 Large Magellanic Cloud 45 Milky Way galaxy 45 Milky Way 45 meteor shower 45 Sagittarius 45 gamma ray burst 45 Galaxies 45 Cygnus 45 supernova explosion 45 Big Dipper 45 XMM Newton 44 Perseus 44 circular orbit 44 Aldebaran 44 orbits 44 comet 44 orbiting 44 extrasolar planets 44 planet orbiting 44 asteroid belt 44 HD #b [002] 43 THEMIS 43 aurora 43 Solar System 43 planets 43 brown dwarf 43 Planets 43 terrestrial planets 43 brown dwarfs 43 planets orbiting 43 orbited 43 orbital 43 elliptical orbit 42 interstellar space 42 Ganymede 42 Kuiper Belt 42 Perseids 42 distant galaxies 42 spiral galaxies 42 Saturn rings 42 supernova explosions 42 Procyon 42 globular clusters 42 JWST 42 heliosphere 42 equatorial 42 Darkseid 42 Iapetus 42 fainter 42 galaxy cluster 41 Regulus 41 exoplanet 41 Icarus 41 celestial 41 GLAST 41 GRBs 41 GOCE 41 crescent moon 41 exoplanets 41 spacecraft 41 rocky planets 41 Saturn moon 41 comet nucleus 41 meteors 41 Aurora Borealis 40 gamma ray bursts 40 sunspot 40 moon Titan