Related by context. Frequent words. (Click for all words.) 65 HD #b [002] 64 Milky Way Galaxy 64 nebula 64 supernova explosion 64 quasars 63 distant galaxy 63 gamma ray burst 63 galaxy cluster 62 supernova 62 quasar 62 XMM Newton 62 Betelgeuse 61 GRBs 61 extrasolar planet 61 spiral galaxy 60 supernovae 60 brown dwarf 60 nebulae 60 Milky Way galaxy 59 distant galaxies 59 galaxies 59 galaxy 59 Milky Way 59 gamma ray bursts 58 galaxy clusters 58 supermassive black hole 58 supernovas 58 planet orbiting 58 redshift 58 exoplanet 58 elliptical galaxies 57 infrared wavelengths 57 gamma rays 57 exoplanets 57 spiral galaxies 57 Uranus 57 globular clusters 57 interstellar medium 56 pulsar 56 cosmic microwave background 56 Saturn rings 56 Spitzer Space Telescope 56 planets orbiting 56 brown dwarfs 55 unaided eye 55 supermassive black holes 55 comet 55 planets 55 aurora 55 neutron star 55 astronomers 55 Cassiopeia 55 NASA Chandra 54 Enceladus 54 extrasolar planets 54 pulsars 54 luminosity 54 heliosphere 54 Saturn moons 53 Solar System 53 X ray Observatory 53 rocky planets 53 gravitational lensing 53 moons 53 Astronomers 53 auroras 53 NASA Cassini spacecraft 53 WMAP 53 Space Telescope 53 cosmic ray 53 celestial objects 53 interstellar dust 53 ringed planet 53 occultation 53 Cassini spacecraft 52 CMEs 52 gamma ray 52 cosmic rays 52 neutron stars 52 comets 52 moon Titan 51 cosmos 51 cosmologists 51 universe 51 corona 51 meteor shower 51 sunspot 51 terrestrial planets 51 fainter 51 Saturn moon 51 Perseids 51 Sedna 51 perigee 51 dwarf galaxies 51 optical telescopes 51 astrophysicists 51 solar flares 50 deuterium 50 Pleiades 50 gravitational waves 50 Perseid meteor shower