Related by context. Frequent words. (Click for all words.) 71 galaxy cluster 70 distant galaxy 69 Andromeda galaxy 66 Andromeda Galaxy 66 Milky Way Galaxy 64 globular cluster 64 supernova remnant 64 distant galaxies 63 X ray emission 63 dwarf galaxy 63 quasar 62 HD #b [002] 62 Milky Way galaxy 62 Orion Nebula 61 quasars 61 Large Magellanic Cloud 61 magnetar 61 celestial object 61 galaxies 60 galaxy clusters 60 supermassive black hole 60 spiral galaxy 60 supernova explosion 60 gamma ray burst 60 redshift 60 comet nucleus 59 XMM Newton 59 nebula 59 ejecta 59 Eta Carinae 59 spiral galaxies 59 infrared wavelengths 59 Milky Way 59 GRBs 58 X ray Observatory 58 galaxy 58 Betelgeuse 58 interstellar dust 58 planet orbiting 58 constellation Leo 58 elliptical galaxies 58 ringed planet 57 Earth magnetosphere 57 supernova explosions 57 optical telescopes 57 GeV 57 neutron star 56 astronomical objects 56 ecliptic 56 gravitational lensing 56 supermassive black holes 56 dwarf galaxies 56 rocky planets 56 Saturn moon Enceladus 56 globular clusters 56 NASA Cassini spacecraft 56 unaided eye 55 Cassini Huygens 55 Very Large Telescope 55 magnetosphere 55 Enceladus 55 neutron stars 55 pulsar 55 interstellar medium 55 supernovae 55 brown dwarf 55 auroral 55 torus 54 galactic 54 gravitational wave 54 extrasolar planet 54 ESO Very Large Telescope 54 cosmic microwave background 54 WM Keck Observatory 54 astrophysical 54 brown dwarfs 54 nebulae 54 WIMPs 54 muon 54 gravitational waves 54 astronomers 54 NASA Chandra 54 spacetime 54 comet Wild 54 gamma rays 54 starbursts 54 interferometry 54 meteoroids 53 planets orbiting 53 moon Titan 53 gamma ray bursts 53 COROT 53 gravitationally 53 Very Large Array 53 Spitzer Space Telescope 53 exoplanet 53 Sedna 53 supernova 53 exoplanets 53 outer planets 53 accreting