Related by context. Frequent words. (Click for all words.) 71 Betelgeuse 63 Orion Nebula 63 constellations 62 Scorpius 61 Pleiades 61 nebula 58 Milky Way Galaxy 57 Arcturus 56 distant galaxy 56 nebulae 56 occultation 56 unaided eye 55 Deneb 55 spiral galaxy 55 Cassiopeia 54 X ray emission 54 constellation 54 crescent moon 54 Perseids 54 ringed planet 54 HD #b [002] 54 Perseid meteor shower 53 planet orbiting 53 Eta Carinae 52 galaxy 52 aurora 52 Big Dipper 52 infrared wavelengths 52 Spica 52 celestial objects 51 Milky Way 51 galaxy cluster 51 gamma ray burst 51 extrasolar planets 51 Milky Way galaxy 51 Aldebaran 51 orb 51 Ursa Major 51 meteor shower 50 distant galaxies 50 sky 50 Spitzer Space Telescope 50 Sedna 50 planets orbiting 50 fainter 50 ellipse 50 meteor showers 49 XMM Newton 49 extrasolar planet 49 spiral galaxies 49 quasar 49 Ophiuchus 49 sunspot 49 planets 49 celestial 49 elliptical galaxies 49 gamma ray bursts 48 quasars 48 redshift 48 supernova 48 supernovas 48 dwarf galaxy 48 Saturn rings 48 galaxies 48 GRBs 47 supernova explosion 47 Sagittarius 47 supernovae 47 autumnal equinox 47 bluish 47 meteors 47 tiger stripes 47 Aurora Borealis 47 auroras 47 comet 47 Large Magellanic Cloud 47 Pollux 47 terrestrial planets 46 Procyon 46 infrared 46 orbits 46 exoplanet 46 globular clusters 46 Earth asteroids 46 cosmic microwave background 46 aurora borealis 46 Uranus 45 brown dwarfs 45 optical telescopes 45 supernova explosions 45 THEMIS 45 astronomers 45 field Infrared Survey 45 telescope 45 crescent 45 starlight 45 umbra 45 exoplanets 45 moons 45 eyepiece 45 rocky planets