Related by context. Frequent words. (Click for all words.) 57 Eta Carinae 55 supernova 54 Large Magellanic Cloud 54 X ray emission 53 galaxy cluster 53 dwarf galaxy 52 HD #b [002] 52 ejecta 52 supernova explosion 52 Cassiopeia 52 quasar 51 spiral galaxy 51 neutron star 51 dwarf galaxies 51 elliptical galaxies 51 distant galaxy 51 brown dwarf 51 globular clusters 50 cosmic microwave background 50 Milky Way galaxy 50 Spitzer Space Telescope 50 supernovae 50 nebula 50 brown dwarfs 50 Milky Way 49 Betelgeuse 49 supernovas 49 redshift 49 Saturn rings 49 galaxies 49 supermassive black hole 49 quasars 48 Milky Way Galaxy 48 gamma ray burst 48 Orion Nebula 48 distant galaxies 48 supernova explosions 47 galaxy 47 interstellar dust 47 GRBs 47 Enceladus 47 pulsar 47 galaxy clusters 47 unaided eye 47 sunspot 47 spiral galaxies 47 comet nucleus 46 spectroscopic 46 cosmic dust 46 cosmic ray 46 exoplanet 46 XMM Newton 46 Alpha Centauri 46 comet 45 Gliese 45 NASA Chandra 45 nebulae 45 extrasolar planet 45 planet orbiting 45 neutron stars 45 gravitational lensing 45 deuterium 45 neutrino 45 infrared wavelengths 45 planets orbiting 44 Iapetus 44 WM Keck Observatory 44 coronal mass ejection 44 ultraviolet 44 rocky planets 44 extrasolar planets 44 ringed planet 44 terrestrial planets 44 meteor 43 astrophysicists 43 gravitationally 43 positrons 43 pulsars 43 astronomer 43 interstellar medium 43 astronomers 42 super Earths 42 exoplanets 42 cosmic rays 42 aurora 42 astrophysical 42 corona 42 Harvard Smithsonian 42 infrared telescope 42 WMAP 42 supermassive black holes 42 X ray Observatory 42 gamma ray 42 gamma rays 41 meteorite 41 Geminids 41 Kuiper Belt 41 Sedna 41 cometary 41 optical telescope 41 Solar System