Related by context. Frequent words. (Click for all words.) 65 X ray emission 65 unaided eye 65 Eta Carinae 64 Andromeda galaxy 64 supernova remnant 64 distant galaxy 63 Andromeda Galaxy 63 extrasolar planet 63 infrared wavelengths 62 nebula 62 Orion Nebula 62 supernova explosion 62 gamma ray burst 62 supernova 61 Geminids 61 nebulae 61 constellation Leo 60 dwarf galaxy 60 spiral galaxy 60 magnetar 60 planet orbiting 60 celestial object 60 auroral 60 occultation 59 galaxy cluster 59 XMM Newton 59 Milky Way Galaxy 59 astronomical objects 59 GRBs 58 Large Magellanic Cloud 58 constellation Perseus 58 HD #b [002] 58 astronomers 58 Leonids 58 supermoon 58 luminosity 58 quasar 58 comet 58 planets orbiting 57 Betelgeuse 57 interstellar dust 57 Saturn rings 57 spiral galaxies 57 aurora 57 comet nucleus 56 sunspot 56 ecliptic 56 Kuiper belt 56 globular cluster 56 Milky Way galaxy 56 quasars 56 Halley Comet 56 brown dwarf 55 gamma ray bursts 55 supernovae 55 ringed planet 55 meteoroid 55 perigee 55 COROT 55 celestial objects 55 comet Hartley 2 55 Perseid meteor shower 55 ejecta 54 cosmic microwave background 54 Iapetus 54 distant galaxies 54 supernova explosions 54 exoplanets 54 redshift 54 meteor shower 54 coronal mass ejection 54 Milky Way 54 exoplanet 54 galaxies 54 supernovas 54 extrasolar planets 54 Perseids 54 moonrise 54 orbits 54 brightness 54 total lunar eclipse 54 elliptical galaxies 54 starbursts 54 pulsar 54 Pleiades 54 NASA Cassini spacecraft 53 rocky planets 53 Sedna 53 globular clusters 53 moons 53 galaxy 53 fainter 53 partial lunar eclipse 53 GeV 53 planets 53 partial eclipse 53 corona 53 ionized gas 53 neutron star 53 Global Surveyor 53 optical telescopes