Related by context. Frequent words. (Click for all words.) 61 Milky Way Galaxy 61 Betelgeuse 61 Pleiades 60 Scorpius 59 umbra 58 distant galaxy 58 Perseids 58 Milky Way 58 HD #b [002] 57 nebula 57 Cassiopeia 57 spiral galaxy 57 Ophiuchus 57 Arcturus 56 ringed planet 55 galaxy cluster 55 Sedna 55 spiral galaxies 55 constellations 55 unaided eye 54 elliptical galaxies 54 Uranus 54 meteor shower 54 Perseid meteor shower 53 galaxy 53 nebulae 53 Spica 53 meteors 53 Big Dipper 53 Ursa Major 53 occultation 53 Procyon 53 Sagittarius 52 perigee 52 constellation 52 meteor showers 51 quasar 51 aurora 51 ejecta 51 distant galaxies 51 planets 51 gamma ray burst 51 Saturn rings 51 brown dwarf 51 planet orbiting 51 crescent moon 50 supernova explosion 50 Milky Way galaxy 50 vernal equinox 50 equator 50 bluish 50 Enceladus 50 GRBs 50 globular clusters 50 equinox 50 Halley Comet 50 autumnal equinox 50 neutron star 50 spring equinox 50 Kuiper Belt 50 supermassive black hole 50 fainter 50 rocky planets 50 comet 49 orb 49 planets orbiting 49 ellipse 49 partial eclipse 49 supernova 49 galaxies 49 brown dwarfs 49 celestial bodies 49 circular orbit 49 gamma ray bursts 49 terrestrial planets 48 Jupiter Saturn Uranus 48 moons 48 extrasolar planet 48 comet nucleus 48 sunspot 48 quasars 48 aurora borealis 48 celestial 48 corona 48 Andromeda 48 Aurora Borealis 48 equatorial 48 Pollux 47 extrasolar planets 47 moon Titan 47 Iapetus 47 tiger stripes 47 infrared wavelengths 47 elliptical orbit 47 reddish 47 infrared radiation 47 orbits 47 outer planets 47 cosmic microwave background 47 interstellar dust 47 redshift