Related by context. Frequent words. (Click for all words.) 64 distant galaxy 63 nebula 62 HD #b [002] 60 spiral galaxy 60 gamma ray burst 60 Milky Way Galaxy 60 planet orbiting 59 supernova 59 galaxy 59 galaxy cluster 58 supernova explosion 58 quasar 57 brown dwarfs 57 Milky Way 56 redshift 56 brown dwarf 56 Milky Way galaxy 56 Sedna 56 Arcturus 56 unaided eye 55 supernovas 55 gamma ray bursts 55 nebulae 55 extrasolar planets 55 Pleiades 55 elliptical galaxies 55 fainter 54 galaxies 54 infrared wavelengths 54 distant galaxies 54 exoplanets 54 Cassiopeia 54 supernovae 54 quasars 54 XMM Newton 53 planets orbiting 53 rocky planets 53 globular clusters 53 extrasolar planet 53 planets 53 spiral galaxies 53 neutron star 53 orbits 52 Alpha Centauri 52 Aldebaran 52 Uranus 52 constellation 51 galaxy clusters 51 exoplanet 51 pulsar 51 comet 51 Gliese 51 sunspot 51 ringed planet 51 Spica 50 supermassive black hole 50 suns 50 gamma rays 50 meteor shower 49 moon Titan 49 dwarf galaxies 49 heliosphere 49 cosmic microwave background 49 Andromeda 49 pulsars 49 moons 48 Spitzer Space Telescope 48 Perseids 48 Enceladus 48 interstellar medium 48 Saturn rings 48 circular orbit 48 supermassive black holes 48 Astronomers 48 habitable zone 48 corona 48 astronomers 47 asteroid 47 solar flares 47 Iapetus 47 galactic 47 constellations 47 Solar System 47 neutrinos 46 aurora 46 Very Large Telescope 46 meteors 46 asteroids 46 sunspots 46 Procyon 46 cosmic rays 46 tiger stripes 46 Saturn moon 45 Space Telescope 45 elliptical orbit 45 celestial objects 45 Perseid meteor shower 45 luminosity 45 crescent moon 45 planetary 45 crater