Related by context. Frequent words. (Click for all words.) 66 distant galaxy 65 galaxies 64 dwarf galaxy 63 distant galaxies 63 supernova explosion 62 magnetar 62 neutron stars 61 nebulae 61 quasars 61 globular clusters 61 Milky Way galaxy 60 neutron star 60 Milky Way Galaxy 60 dwarf galaxies 60 galaxy cluster 60 elliptical galaxies 60 galaxy clusters 59 GRBs 59 Orion Nebula 59 terrestrial planets 59 rocky planets 58 planets 58 supernovae 58 brown dwarfs 57 brown dwarf 57 quark gluon plasma 57 atomic nuclei 57 spacetime 57 supernova remnant 56 supernova explosions 56 X ray emission 56 HD #b [002] 56 Eta Carinae 56 planet orbiting 56 X ray Observatory 56 spiral galaxy 56 Milky Way 55 spiral galaxies 55 quasar 55 supernovas 55 galaxy 55 gamma ray burst 55 hot Jupiters 55 nebula 55 supermassive black holes 55 gamma ray bursts 55 supermassive black hole 55 comet nucleus 55 gravitationally 54 accreting 54 interstellar dust 54 nuclei 54 pulsars 54 gravitational waves 54 super Earths 54 redshift 54 supernova 54 Saturn rings 53 Large Magellanic Cloud 53 atomic particles 53 outer planets 53 interstellar medium 52 subatomic particles 52 gamma rays 52 Astronomers 52 comet 52 planets orbiting 52 extrasolar planet 52 comets 52 exoplanets 52 Solar System 52 positrons 51 NASA Chandra 51 pulsar 51 orbits 51 COROT 51 atoms 51 optical telescopes 51 Galaxies 51 ejecta 51 astronomers 51 Iapetus 51 celestial bodies 51 subatomic 50 Spitzer Space Telescope 50 hydrogen atoms 50 Saturn moons 50 neutrino 50 asteroids 50 XMM Newton 50 silicates 50 cosmic dust 50 extrasolar planets 50 unaided eye 49 ringed planet 49 muons 49 WM Keck Observatory 49 cosmic microwave background 49 suns 49 gravitational wave 49 heliosphere