Related by context. Frequent words. (Click for all words.) 67 globular clusters 66 supermassive black holes 65 elliptical galaxies 64 galaxies 64 brown dwarfs 64 neutron stars 63 Milky Way Galaxy 63 dwarf galaxies 63 supernova explosions 63 neutron star 63 galaxy clusters 63 supernovae 62 GRBs 62 dwarf galaxy 62 super Earths 62 nebulae 61 planets 61 supermassive black hole 61 galaxy 61 supernovas 61 supernova 61 spiral galaxies 61 supernova explosion 60 quasar 60 quasars 60 distant galaxies 60 Milky Way 60 Eta Carinae 59 distant galaxy 59 rocky planets 59 galactic 59 galaxy cluster 59 brown dwarf 59 suns 58 Milky Way galaxy 58 X ray Observatory 58 X ray emission 57 nebula 57 hot Jupiters 57 terrestrial planets 57 accreting 57 gravitationally 57 astrophysical 57 Orion Nebula 57 gamma ray bursts 56 HD #b [002] 56 pulsars 56 gamma rays 55 planetary 55 exoplanets 55 gravitational waves 55 spiral galaxy 55 ejecta 54 planets orbiting 54 astrophysicists 54 earths 54 extrasolar planets 54 cosmological 54 gamma ray burst 54 cosmic 54 vortexes 53 planet orbiting 53 orbits 53 redshift 53 Large Magellanic Cloud 53 astronomers 53 spacetime 53 XMM Newton 53 pulsar 53 comets 53 outer planets 52 interstellar medium 52 interstellar dust 52 nuclei 52 Galaxies 52 positrons 52 gravitational lensing 52 asteroids 52 atomic nucleus 51 Spitzer Space Telescope 51 spherical 51 Saturn moons 51 Saturn rings 51 atomic nuclei 51 optical telescopes 51 silicates 51 extrasolar planet 51 moons 51 neutrons 50 Kuiper Belt 50 neutrino 50 neutrinos 50 cosmic rays 50 Astronomers 50 NASA Chandra 50 cometary 50 Solar System 49 olivine 49 comet nucleus 49 astronomical observations 49 exoplanet