Related by context. Frequent words. (Click for all words.) 67 constellation Leo 64 HD #b [002] 62 Milky Way Galaxy 61 Betelgeuse 60 Orion Nebula 60 Deneb 60 Andromeda galaxy 59 unaided eye 59 Andromeda Galaxy 59 planet orbiting 59 supernova remnant 58 Large Magellanic Cloud 58 Eta Carinae 58 dwarf galaxy 57 distant galaxy 57 galaxy cluster 57 quasar 57 nebula 57 Milky Way 57 nebulae 56 globular cluster 56 gamma ray burst 56 X ray emission 56 magnetar 55 spiral galaxy 55 Gliese 55 GRBs 55 Cassiopeia 55 Leonids 55 planets orbiting 55 Pleiades 55 extrasolar planet 54 brown dwarf 54 Milky Way galaxy 54 XMM Newton 54 ionized gas 54 Spitzer Space Telescope 54 supernova explosion 54 super Earths 54 Perseids 53 infrared wavelengths 53 quasars 53 spiral galaxies 52 constellation 52 ringed planet 52 extrasolar planets 52 optical telescopes 52 Geminids 52 Arcturus 52 optical telescope 52 ecliptic 52 meteoroids 52 redshift 52 supernova 51 celestial object 51 Sedna 51 comet 51 brown dwarfs 51 cosmic microwave background 51 Jupiter Saturn Uranus 51 pulsar 51 exoplanets 51 Scorpius 51 fainter 51 galaxy 51 supernovas 51 constellations 51 globular clusters 50 rocky planets 50 neutron star 50 occultation 50 Very Large Telescope 50 Saturn rings 50 suns 50 starlight 50 Perseid meteor shower 50 Very Large Array 50 gamma ray bursts 50 shines brightly 50 distant galaxies 50 umbra 49 aurora 49 COROT 49 astronomers 49 exoplanet 49 X ray Observatory 49 Alpha Centauri 49 ESO Very Large Telescope 49 celestial objects 49 ejecta 49 Saturn moon Enceladus 49 planets 49 elliptical galaxies 49 supernova explosions 49 ellipse 49 hot Jupiters 49 galaxies 49 meteor shower 49 starbursts 49 orb 48 astronomical objects