Related by context. Frequent words. (Click for all words.) 69 spiral galaxy 69 supernova remnant 68 Andromeda galaxy 67 Orion Nebula 66 galaxy cluster 66 Crab Nebula 66 distant galaxy 64 nebula 64 Large Magellanic Cloud 64 Milky Way Galaxy 64 Andromeda Galaxy 64 Milky Way galaxy 62 Mimas 62 spiral galaxies 62 XMM Newton 62 globular cluster 62 Fomalhaut 62 supernova explosion 62 Milky Way 61 X ray emission 61 quasar 61 Eta Carinae 61 dwarf galaxy 60 constellation Leo 60 Saturn rings 60 comet nucleus 60 constellation Orion 60 distant galaxies 60 gamma ray burst 60 NASA Cassini spacecraft 59 HD #b [002] 59 Cancri 59 Saturn moon Enceladus 59 ringed planet 58 infrared wavelengths 58 magnetar 58 Betelgeuse 58 planet orbiting 58 constellation Perseus 58 galaxies 57 celestial object 57 ejecta 57 Spitzer Space Telescope 57 accretion disk 57 unaided eye 57 globular clusters 57 ionized gas 57 quasars 57 Voyager spacecraft 57 Palomar Observatory 57 galaxy 56 nebulae 56 Earth magnetosphere 56 extrasolar planet 56 COROT 56 planet orbits 56 comet Wild 56 Cassini spacecraft 56 auroral 56 interstellar dust 56 infrared telescope 56 ESO Very Large Telescope 56 comet 55 elliptical galaxies 55 Enceladus 55 Comet Tempel 1 55 brown dwarf 55 Kuiper belt 55 Very Large Telescope 55 astronomers 55 redshift 55 meteoroids 55 supermassive black hole 55 New Horizons spacecraft 54 Iapetus 54 Very Large Array 54 planets orbiting 54 galaxy clusters 54 Moderate Resolution 54 NASA ESA Hubble 54 Cassiopeia 54 sunspot 54 optical telescopes 54 NASA Aqua 53 MODIS 53 Saturn moon 53 annular eclipse 53 GRBs 53 supernova 53 X ray Observatory 53 comet Hartley 2 53 ecliptic 53 orbiting 53 extrasolar planets 53 pulsar 53 optical telescope 53 Cassini orbiter 53 GeV 53 aurora 52 Opportunity rover 52 supernova explosions