Related by context. Frequent words. (Click for all words.) 79 constellation Perseus 76 constellation Leo 67 Crab Nebula 67 HD #b [002] 65 ecliptic 65 Eta Carinae 65 distant galaxy 64 Andromeda Galaxy 64 Andromeda galaxy 64 Betelgeuse 63 X ray emission 63 Orion Nebula 63 Fomalhaut 62 Milky Way Galaxy 62 celestial object 62 spiral galaxy 62 supernova remnant 61 unaided eye 61 gamma ray burst 61 galaxy cluster 61 planet orbiting 61 perigee 61 nebula 60 magnetar 60 Kuiper belt 59 extrasolar planet 59 globular cluster 59 accretion disk 59 Gliese #g 58 umbra 58 Large Magellanic Cloud 58 brown dwarf 58 infrared wavelengths 58 Saturn moon Enceladus 58 ionized gas 58 Milky Way 58 dwarf galaxy 58 Scorpius 58 occultation 58 supernova explosion 57 Perseids 57 quasar 57 nebulae 57 Geminids 56 COROT 56 Milky Way galaxy 56 Pleiades 56 Enceladus 56 XMM Newton 56 Cassiopeia 56 redshift 56 Leonids 56 GRBs 55 constellation 55 spiral galaxies 55 galaxy 55 coronal mass ejection 55 planets orbiting 55 Mimas 55 sunspot 55 ringed planet 55 Deneb 55 Arcturus 55 circular orbit 55 distant galaxies 55 annular eclipse 55 supernova 55 aurora 55 supermassive black hole 55 auroral 54 orbits 54 supermoon 54 Uranus 54 Ophiuchus 54 comet nucleus 54 cosmic microwave background 54 substorms 54 brown dwarfs 54 Perseid 54 Gliese 53 interstellar dust 53 infrared radiation 53 NASA Aqua 53 rocky planets 53 ejecta 53 NASA Cassini spacecraft 53 exoplanets 53 comet 53 gamma rays 53 comet Wild 53 meteor shower 53 GeV 53 moonrise 53 Iapetus 52 pulsar 52 elliptical galaxies 52 elliptical orbit 52 neutron star 52 Saturn rings 52 Opportunity rover 52 orb