Related by context. Frequent words. (Click for all words.) 68 supernova explosion 66 magnetar 64 elliptical galaxies 64 globular cluster 64 distant galaxy 63 comet nucleus 63 ejecta 63 dwarf galaxy 63 neutron star 63 terrestrial planets 63 celestial object 62 supernova remnant 62 galaxy cluster 62 galaxies 62 GRBs 62 Saturn rings 61 quark gluon plasma 61 rocky planets 61 asteroid 61 dwarf galaxies 61 super Earths 61 X ray emission 61 HD #b [002] 61 comet 61 hot Jupiters 60 Eta Carinae 60 gamma ray burst 60 nebula 60 planet orbiting 60 brown dwarf 60 planets 60 supernova explosions 60 brown dwarfs 60 quasar 59 Andromeda galaxy 59 pulsar 59 Saturn moons 59 globular clusters 59 extrasolar planet 59 meteoroids 59 supernova 59 cometary 59 gravitationally 59 outer planets 59 galaxy clusters 58 Iapetus 58 planets orbiting 58 silicates 58 Jupiter moons 58 spacetime 58 spiral galaxy 58 astronomers 58 Sedna 58 distant galaxies 58 Milky Way galaxy 58 Milky Way Galaxy 58 comets 57 interstellar dust 57 neutron stars 57 Comet Tempel 1 57 spiral galaxies 57 supernovae 57 asteroids 57 quasars 57 Orion Nebula 56 galaxy 56 Earth magnetosphere 56 impactor 56 extrasolar planets 56 interstellar medium 56 nebulae 55 exoplanets 55 orbits 55 Astronomers 55 radioactive decay 55 supernovas 55 Lutetia 55 cosmic microwave background 55 Large Magellanic Cloud 55 olivine 55 heliosphere 55 Andromeda Galaxy 54 coronal mass ejection 54 cosmic ray 54 astrophysicists 54 martian 54 Solar System 54 supermassive black hole 54 supermassive black holes 54 Itokawa 54 dynamical 54 Milky Way 54 moons 54 interstellar space 54 Kuiper Belt 54 habitable planet 54 pulsars 54 magnetosphere 53 neutrino 53 exoplanet 53 asteroid belt