Related by context. Frequent words. (Click for all words.) 54 Pleiades 50 Arcturus 50 Big Dipper 48 Procyon 48 Scorpius 46 Betelgeuse 45 Cassiopeia 44 constellation 44 constellations 44 Aldebaran 43 Cygnus 43 Milky Way Galaxy 43 Andromeda 43 HD #b [002] 43 Milky Way 42 Spica 42 Deneb 41 Aurora Borealis 41 Orion 41 Eta Carinae 41 Grizzly Bear 41 nebula 40 Nebula 40 Ophiuchus 40 Sagittarius 40 Alpha Centauri 40 Pollux 40 Uranus 40 Corvus 40 nebulae 40 Large Magellanic Cloud 40 Howling 40 Planets 39 spiral galaxies 39 dwarf galaxy 39 rover Opportunity 39 exoplanets 39 Regulus 39 planet orbiting 39 Sedna 39 Sleeping Giant 39 Antares 39 West Timmins Mining 39 globular clusters 38 planets orbiting 38 extrasolar planets 38 Sunspot 38 extrasolar planet 38 Io 38 spiral galaxy 38 Auriga 38 Phobos 38 elliptical galaxies 37 Galaxies 37 ringed planet 37 Saturn moons 37 Orion Nebula 37 Ganymede 37 Powderhorn 37 Saturn moon 37 Moon 37 starry sky 37 AuEx 37 astronomical observations 37 galaxy cluster 37 aurora borealis 37 distant galaxy 37 Tetons 37 Ptarmigan 37 Dark Matter 37 XMM Newton 36 Minotaur 36 terrestrial planets 36 Stargazer 36 ESO Very Large Telescope 36 celestial 36 outer planets 36 Constellations 36 neutron star 36 Taurus 36 Moons 36 Electrum 36 Perseids 36 occultation 36 dwarf galaxies 36 Gamma Ray 36 circumpolar 35 Rye Patch 35 planets 35 Amethyst 35 meteor shower 35 Spitzer Space Telescope 35 Virgo 35 X ray emission 35 unaided eye 35 Northern Lights 35 Full Moon 35 Loon 35 orbiting 35 gamma ray 35 Milky Way galaxy