Related by context. Frequent words. (Click for all words.) 70 Orion Nebula 69 distant galaxy 68 nebula 67 galaxy cluster 66 spiral galaxy 66 Eta Carinae 66 Milky Way Galaxy 65 Betelgeuse 65 Cassiopeia 65 supernova explosion 64 Large Magellanic Cloud 63 dwarf galaxy 62 X ray emission 62 quasar 62 HD #b [002] 62 spiral galaxies 62 supernova 61 nebulae 61 galaxy 61 Milky Way 61 planets orbiting 61 Milky Way galaxy 60 distant galaxies 60 planet orbiting 60 globular clusters 59 galaxies 59 XMM Newton 59 ringed planet 59 galaxy clusters 59 elliptical galaxies 59 supernovae 59 gamma ray burst 58 exoplanets 58 redshift 58 supernova explosions 58 brown dwarfs 58 quasars 58 infrared wavelengths 58 neutron star 58 extrasolar planet 58 Gliese 58 supernovas 57 brown dwarf 57 extrasolar planets 57 auroras 57 ejecta 57 aurora 56 constellation 56 rocky planets 56 supermassive black hole 56 GRBs 56 Scorpius 56 comet 55 pulsar 55 astronomers 55 corona 55 comet nucleus 55 Pleiades 55 Uranus 55 planets 55 unaided eye 55 sunspot 55 Saturn rings 55 neutron stars 55 Iapetus 55 Geminids 54 infrared telescope 54 cosmic microwave background 54 Spitzer Space Telescope 54 supermassive black holes 54 orbits 54 gamma ray bursts 54 suns 53 Leonids 53 super Earths 53 Arcturus 53 dwarf galaxies 53 starburst 53 luminosity 52 pulsars 52 ellipse 52 celestial objects 52 Sedna 52 constellations 52 exoplanet 52 optical telescopes 52 meteor shower 52 NASA Cassini spacecraft 52 starlight 51 orb 51 umbra 51 Enceladus 51 terrestrial planets 51 X ray Observatory 51 gravitational lensing 51 Astronomers 51 gravitationally 51 gamma rays 51 Perseids 51 interstellar dust 51 Very Large Telescope