Related by context. Frequent words. (Click for all words.) 54 Spica 53 constellation Leo 52 Andromeda Galaxy 52 Orion Nebula 51 Betelgeuse 51 GeV 50 HD #b [002] 50 galaxy cluster 50 unaided eye 49 redshift 49 distant galaxy 49 globular cluster 49 supernova remnant 49 nebula 48 spiral galaxies 48 electron volts 48 brown dwarf 48 magnetar 48 sunspot 47 Milky Way 47 Large Magellanic Cloud 47 Deneb 47 planet orbiting 47 Andromeda galaxy 47 infrared wavelengths 47 spiral galaxy 47 Arcturus 47 dwarf galaxy 47 nebulae 46 Cassiopeia 46 Sedna 46 Milky Way Galaxy 46 Scorpius 46 supernova 46 ejecta 45 Iapetus 45 perigee 45 gamma ray burst 45 quasar 45 Sunspot 45 umbra 45 Uranus 45 ecliptic 45 WIMPs 44 Eta Carinae 44 Pollux 44 terrestrial planets 44 Pleiades 44 X ray emission 44 planets orbiting 44 brown dwarfs 44 extrasolar planet 44 orbits 43 rocky planets 43 Milky Way galaxy 43 Aldebaran 43 supernova explosions 43 auroral 43 supernova explosion 43 galaxies 43 Solar System 43 elliptical galaxies 43 Sunspots 43 supernovae 42 galaxy 42 aurora 42 celestial object 42 suns 42 fainter 42 quasars 42 planets 42 super Earths 42 Perseids 42 distant galaxies 42 coronal mass ejection 42 Galaxies 42 COROT 42 Gliese 42 gamma rays 41 Saturn 41 XMM Newton 41 Procyon 41 exoplanet 41 dwarf galaxies 41 Jupiter 41 pulsar 41 supernovas 41 Ophiuchus 41 Nebula 41 celestial objects 41 globular clusters 41 Deimos 41 habitable planets 41 Gamma 41 Leonids 41 supermoon 41 astronomical objects 41 GRB 41 pulsars 41 circular orbit 40 neutron star