Related by context. Frequent words. (Click for all words.) 61 X ray emission 60 spiral galaxies 58 GRBs 58 quasars 58 globular clusters 57 terrestrial planets 57 brown dwarfs 57 hot Jupiters 57 dwarf galaxy 57 supernovae 57 supernova explosion 57 dwarf galaxies 56 interstellar medium 56 ejecta 56 elliptical galaxies 56 dynamical 56 planet orbiting 56 gravitationally 56 planets orbiting 56 galaxy clusters 56 galaxies 56 supermassive black hole 55 distant galaxy 55 rocky planets 55 quasar 55 Jupiter moons 54 galaxy cluster 54 Eta Carinae 54 occultation 54 supernova explosions 54 magnetosphere 54 HD #b [002] 54 supermassive black holes 54 neutron star 54 super Earths 54 Saturn moons 54 spacetime 53 interstellar dust 53 nebulae 53 redshift 53 Milky Way Galaxy 53 extrasolar planets 53 supernova remnant 53 planets 53 Large Magellanic Cloud 53 outer planets 53 pulsars 53 supernovas 53 exoplanets 53 silicates 53 distant galaxies 53 Saturn rings 53 X ray Observatory 52 gravitational waves 52 astronomers 52 accreting 52 Milky Way 52 vortices 52 orbits 52 exoplanet 52 Milky Way galaxy 52 brown dwarf 52 nebula 52 CMEs 51 gravitational lensing 51 supernova 51 ecliptic 51 neutron stars 51 comets 51 Orion Nebula 51 pulsar 51 celestial bodies 51 extrasolar planet 51 astronomical observations 50 anisotropy 50 superfluid 50 Sedna 50 magnetic fields 50 Saturn moon 50 galaxy 50 astrophysical 50 XMM Newton 49 interferometry 49 auroras 49 cosmological 49 gravitational 49 coronal mass ejections 49 gamma ray bursts 49 Astrophysical Journal 49 comet 49 Galaxies 49 spiral galaxy 49 NASA Chandra 48 Enceladus 48 comet nucleus 48 Betelgeuse 48 gravitation 48 Uranus 48 convective 48 ionosphere 48 gamma ray burst