Related by context. Frequent words. (Click for all words.) 75 spiral galaxy 72 supernova remnant 71 distant galaxy 71 galaxy cluster 71 globular cluster 70 dwarf galaxy 69 Andromeda Galaxy 69 Eta Carinae 69 nebula 68 supernova explosion 67 Milky Way Galaxy 66 quasar 66 Orion Nebula 66 spiral galaxies 66 X ray emission 65 magnetar 64 Large Magellanic Cloud 64 Milky Way 64 Milky Way galaxy 64 planet orbiting 63 supernova 63 supermassive black hole 63 HD #b [002] 63 galaxy 63 brown dwarf 63 gamma ray burst 62 galaxies 61 globular clusters 61 supernova explosions 60 distant galaxies 60 Betelgeuse 60 neutron star 60 unaided eye 60 elliptical galaxies 60 pulsar 60 galaxy clusters 59 supernovae 58 ejecta 58 GRBs 58 infrared wavelengths 58 extrasolar planet 58 Saturn rings 58 nebulae 58 quasars 58 spacetime 58 planets orbiting 57 extrasolar planets 57 XMM Newton 57 Earth magnetosphere 57 ringed planet 57 torus 57 redshift 57 comet nucleus 57 Sedna 57 Cassiopeia 57 astronomical objects 57 X ray Observatory 56 comet 56 Iapetus 56 Enceladus 56 Spitzer Space Telescope 56 neutron stars 55 supermassive black holes 55 exoplanet 55 occultation 55 Comet Tempel 1 55 astronomers 55 orbiting 55 ecliptic 55 dwarf galaxies 55 Scorpius 55 NASA Cassini spacecraft 55 interferometry 55 accreting 54 exoplanets 54 sunspot 54 supernovas 54 rocky planets 54 pulsars 54 interstellar dust 54 WM Keck Observatory 54 corona 54 brown dwarfs 54 Gliese 54 gamma ray bursts 53 COROT 53 luminosity 53 Pleiades 53 orbits 53 gravitational lensing 53 coronal mass ejection 53 NGC 53 Very Large Array 53 fainter 52 comet Wild 52 optical telescopes 52 ESO Very Large Telescope 52 J# [002] 52 Arcturus 52 infrared telescope 52 gravitationally