Related by context. Frequent words. (Click for all words.) 60 elliptical galaxies 57 brown dwarfs 57 globular clusters 56 X ray emission 56 cosmological 56 galaxies 55 planets 55 GRBs 55 distant galaxy 55 ejecta 55 quasars 55 astronomers 55 supernova explosion 54 nebulae 54 abundances 54 Eta Carinae 54 astrophysicists 54 galaxy clusters 54 supernova 54 distant galaxies 54 astrophysical 54 gravitational lensing 54 neutron stars 53 dwarf galaxies 53 spiral galaxies 53 Jupiter moons 53 supernova explosions 53 supernova remnant 53 dwarf galaxy 53 supernovae 53 magnetar 53 celestial bodies 52 supernovas 52 Milky Way Galaxy 52 astronomical observations 52 brown dwarf 52 super Earths 52 XMM Newton 52 galaxy 52 extrasolar planets 52 terrestrial planets 51 redshift 51 supermassive black holes 51 X ray Observatory 51 Milky Way galaxy 51 gravitational wave 51 nebula 51 dynamical 51 neutron star 50 planet orbiting 50 pulsars 50 Saturn moons 50 interstellar dust 50 planets orbiting 50 spacetime 50 quark gluon plasma 50 rocky planets 50 galaxy cluster 50 Orion Nebula 49 Astronomers 49 spiral galaxy 49 Milky Way 49 supermassive black hole 49 spectroscopic 49 planetary 49 accreting 49 hot Jupiters 49 HD #b [002] 49 celestial objects 49 Einstein theory 48 gravitational waves 48 galactic 48 quasar 48 occultation 48 constellations 48 anisotropy 48 exoplanets 48 celestial 48 gravitationally 48 Saturn rings 48 interferometry 48 gamma ray bursts 47 silicates 47 photometric 47 WM Keck Observatory 47 Earth magnetosphere 47 interstellar medium 47 exoplanet 47 Sedna 47 magnetic fields 47 Large Magellanic Cloud 47 cosmic rays 47 superfluid 47 general relativity 47 cosmologists 47 infrared wavelengths 47 gamma rays 47 WMAP 47 ringed planet 47 geologic 47 moons