Related by context. Frequent words. (Click for all words.) 72 supernova 72 nebula 71 galaxy cluster 69 spiral galaxy 68 quasar 68 distant galaxy 67 gamma ray burst 67 supernova explosion 67 redshift 67 pulsar 66 quasars 66 globular clusters 66 supernovae 65 HD #b [002] 65 brown dwarf 65 distant galaxies 65 Milky Way galaxy 65 Milky Way Galaxy 65 supermassive black hole 64 galaxies 64 neutron star 64 cosmic microwave background 63 elliptical galaxies 63 galaxy 62 planet orbiting 62 galaxy clusters 62 pulsars 62 spiral galaxies 62 gamma ray bursts 61 supernovas 61 Milky Way 60 brown dwarfs 60 infrared wavelengths 60 exoplanet 60 nebulae 60 XMM Newton 60 Cassiopeia 60 astronomers 59 gravitational lensing 59 Spitzer Space Telescope 59 corona 59 Betelgeuse 59 sunspot 58 extrasolar planet 58 gamma rays 58 X ray Observatory 58 NASA Chandra 58 Saturn rings 58 supermassive black holes 58 neutron stars 58 exoplanets 57 extrasolar planets 57 planets orbiting 57 gamma ray 56 dwarf galaxies 56 cosmic rays 55 Enceladus 55 interstellar medium 55 neutrino 55 nuclei 55 spectra 55 comet 55 Astronomers 55 Iapetus 55 interstellar dust 54 WMAP 54 Gliese 54 astrophysicists 54 rocky planets 54 heliosphere 53 spectroscopic 53 fainter 53 terrestrial planets 53 aurora 53 neutrinos 53 orbits 53 ringed planet 53 spacetime 52 cosmic ray 52 Very Large Telescope 52 Kuiper Belt 52 positrons 52 planets 51 Solar System 51 Sedna 51 magnetosphere 51 GRB 51 sunspots 51 WM Keck Observatory 51 Astrophysical Journal Letters 51 unaided eye 51 magnetic fields 51 gravitational waves 50 infrared radiation 50 comets 50 olivine 50 astrophysical 50 plume 50 interferometer 50 ionosphere 50 wavelengths