Related by context. Frequent words. (Click for all words.) 73 Orion Nebula 65 spiral galaxy 65 nebula 65 Andromeda galaxy 63 distant galaxy 63 supernova remnant 63 Andromeda Galaxy 61 Milky Way Galaxy 61 Crab Nebula 61 nebulae 60 Large Magellanic Cloud 60 galaxy cluster 60 Eta Carinae 59 Milky Way galaxy 59 distant galaxies 58 spiral galaxies 58 supernova explosion 58 planet orbits 58 Mimas 58 Saturn rings 58 planets orbiting 58 HD #b [002] 58 globular cluster 57 Betelgeuse 57 astronomical objects 57 galaxies 57 brown dwarf 57 Cancri 57 dwarf galaxy 57 globular clusters 57 Milky Way 57 brown dwarfs 57 supernova explosions 56 celestial object 56 Spitzer Space Telescope 56 planet orbiting 56 constellation Leo 56 elliptical galaxies 56 galaxy 56 Kuiper belt 55 unaided eye 55 Saturn moons 55 terrestrial planets 55 Fomalhaut 54 rocky planets 54 galaxy formation 54 Solar System 54 quasar 54 magnetar 54 ejecta 54 constellation Perseus 53 Saturn moon Enceladus 53 supernovae 53 X ray emission 53 planets 53 ringed planet 53 gamma ray burst 53 neutron star 53 starbursts 53 auroral 53 Cassiopeia 52 XMM Newton 52 heliosphere 52 supernova 52 comet nucleus 52 quasars 52 infrared wavelengths 52 extrasolar planets 52 Pleiades 52 Sedna 52 ionized gas 52 habitable planets 52 X ray Observatory 52 infrared telescope 51 accretion disk 51 Geminids 51 pulsar 51 Jupiter Saturn 51 COROT 51 Saturn moon 51 extrasolar planet 51 hot Jupiters 51 supermassive black hole 51 supernovas 51 torus 51 NASA Chandra 51 Gliese #g 51 GRBs 51 dwarf galaxies 50 exoplanets 50 galaxy clusters 50 interstellar dust 50 Enceladus 50 corona 50 Iapetus 50 comet 50 exoplanet 49 bluish 49 moon Charon 49 redshift 49 cosmic microwave background