Related by context. Frequent words. (Click for all words.) 58 constellation Perseus 55 planetary nebula 55 Orion Nebula 54 nebula 54 constellation Leo 54 Betelgeuse 54 supernova remnant 53 HD #b [002] 53 Large Magellanic Cloud 53 X ray emission 52 constellation Orion 52 XMM Newton 52 Cassiopeia 52 GRB # 52 ionized gas 51 Deneb 51 Crab Nebula 51 aurora 50 Arcturus 50 supernova remnants 50 nebulae 50 Milky Way Galaxy 50 Sunspot 50 planet orbits 50 globular cluster 49 Cancri 49 dwarf galaxy 49 magnetar 49 Galaxy Evolution 49 planet orbiting 49 Fomalhaut 48 Scorpius 48 quasar 48 Milky Way 48 brown dwarf 48 Eta Carinae 48 Kuiper belt 48 Andromeda Galaxy 48 globular clusters 47 Procyon 47 auroral 47 supernova 47 constellation 47 Pleiades 47 supermassive black hole 47 super Earths 47 Sunspots 47 Gamma 47 extrasolar planet 46 terrestrial planets 46 Sedna 46 Andromeda 46 Omicron 46 GRBs 46 distant galaxy 46 supernova explosion 46 infrared wavelengths 46 Sgr 46 GRB 46 Suzaku 46 spiral galaxy 46 rocky planets 46 COROT 46 pulsar 46 ejecta 46 accretion disk 45 galaxy cluster 45 spiral galaxies 45 fainter 45 galaxy 45 exoplanet 45 dwarf galaxies 45 Constellations 45 Spica 45 Haumea 45 Andromeda galaxy 44 extrasolar planets 44 Saturn moon Enceladus 44 planets orbiting 44 gamma ray burst 44 Io 44 phosphorescence 44 quasars 44 neutron star 44 Mimas 44 OGLE 44 Theta 44 Stargazer 44 celestial object 44 elliptical galaxies 44 exoplanets 44 pulsars 44 nova 44 supernovas 44 sunspot 44 distant galaxies 44 lavas 44 supermassive black holes 44 Pulsars 44 habitable planets 44 supernova explosions