Related by context. Frequent words. (Click for all words.) 59 GRBs 58 X ray emission 58 brown dwarfs 58 globular cluster 57 globular clusters 57 astronomical objects 57 gamma ray burst 57 Eta Carinae 56 supernova remnant 56 magnetar 55 HD #b [002] 55 brown dwarf 55 Geminids 54 dwarf galaxy 54 XMM Newton 53 celestial object 53 habitable planets 53 supernova 53 quasars 52 astronomers 52 celestial objects 52 unaided eye 52 spiral galaxy 52 gravitational lensing 52 extrasolar planets 52 elliptical galaxies 52 supernovae 52 distant galaxy 52 auroral 52 supernova explosion 51 extrasolar planet 51 Leonids 51 spiral galaxies 51 nebulae 51 gamma ray bursts 51 redshift 51 planet orbiting 51 Orion Nebula 51 dwarf galaxies 51 exoplanets 50 astrophysicists 50 rocky planets 50 pulsars 50 quasar 50 Andromeda Galaxy 49 exoplanet 49 astronomical observations 49 distant galaxies 49 infrared wavelengths 49 supermassive black hole 49 cosmologists 49 supernova explosions 49 pulsar 49 neutrino 49 galaxies 48 nebula 48 planets orbiting 48 comet nucleus 48 gamma rays 48 quark gluon plasma 48 galaxy clusters 48 WIMPs 48 ejecta 48 Saturn rings 48 Perseids 47 occultation 47 Milky Way galaxy 47 supernovas 47 galaxy cluster 47 interstellar dust 47 Very Large Array 47 substorms 47 Jupiter moons 47 ESO Very Large Telescope 47 gravitational waves 47 gravitational wave 47 hot Jupiters 47 galaxy 47 neutron stars 47 Andromeda galaxy 46 comets 46 luminosity 46 terrestrial planets 46 planets 46 Large Magellanic Cloud 46 auroras 46 optical telescopes 46 cosmic rays 46 wavelengths 46 constellation Perseus 46 COROT 46 cosmic ray 46 constellation Leo 46 neutrinos 46 meteor showers 46 Sedna 46 supermoon 46 Astronomers 46 astrophysical 46 Milky Way Galaxy 45 spectroscopic