Related by context. Frequent words. (Click for all words.) 67 globular clusters 67 spiral galaxies 66 supernova explosions 65 elliptical galaxies 65 rocky planets 65 supernova explosion 65 X ray emission 64 brown dwarfs 64 Eta Carinae 64 dwarf galaxy 64 dwarf galaxies 63 supernovae 63 GRBs 63 galaxy clusters 63 galaxies 63 super Earths 62 supernovas 62 Orion Nebula 62 planets 61 hot Jupiters 61 galaxy cluster 61 planets orbiting 60 supermassive black holes 60 brown dwarf 60 neutron star 60 terrestrial planets 60 planet orbiting 60 neutron stars 60 nebulae 60 quasar 59 quasars 59 spiral galaxy 59 Milky Way Galaxy 58 supermassive black hole 58 supernova 58 distant galaxies 57 exoplanets 57 XMM Newton 57 galaxy 57 Milky Way galaxy 57 Large Magellanic Cloud 57 ejecta 57 gamma ray burst 56 interstellar medium 56 extrasolar planets 56 Betelgeuse 56 accreting 56 gravitationally 56 gamma ray bursts 56 redshift 56 HD #b [002] 56 positrons 56 filaments 56 Saturn moons 55 nebula 55 distant galaxy 55 Spitzer Space Telescope 55 magnetosphere 55 pulsars 55 interstellar dust 54 comets 54 X ray Observatory 54 nuclei 54 gamma rays 54 astrophysical 54 Kuiper Belt 54 cosmic rays 54 silicates 53 orbits 53 solar flares 53 Saturn rings 53 galactic 53 Milky Way 53 exoplanet 53 planetary 53 gravitational waves 53 astrophysicists 53 astronomers 53 pulsar 52 magnetic fields 52 olivine 52 gravitational lensing 52 atomic nuclei 52 abundances 52 clusters 52 quark gluon plasma 52 ringed planet 52 celestial objects 52 unaided eye 52 coronal mass ejections 52 organic molecules 51 luminosity 51 superfluid 51 spectroscopic 51 suns 51 extrasolar planet 51 mid latitudes 51 outer layers 51 convective 51 NASA Chandra 51 electron volts