Related by context. Frequent words. (Click for all words.) 71 brown dwarf 70 exoplanets 70 exoplanet 70 planet orbiting 68 Gliese 68 planets orbiting 67 brown dwarfs 67 Sedna 67 extrasolar planets 67 distant galaxy 66 quasar 65 rocky planets 65 gamma ray burst 64 planets 63 supermassive black hole 63 supernova 63 Milky Way Galaxy 63 neutron star 63 spiral galaxy 63 quasars 63 Enceladus 62 habitable zone 62 Betelgeuse 61 redshift 61 pulsar 61 infrared wavelengths 61 Saturn moon 60 galaxies 60 Milky Way galaxy 60 Milky Way 59 Saturn rings 59 dwarf galaxies 59 astronomers 59 orbits 59 spiral galaxies 59 distant galaxies 59 comet 59 nebula 59 Spitzer Space Telescope 59 galaxy clusters 58 XMM Newton 58 Uranus 58 supernovae 58 gamma rays 58 globular clusters 57 gamma ray bursts 57 fainter 57 infrared radiation 57 galaxy 57 neutrino 57 comets 56 neutron stars 56 UB# [003] 56 pulsars 56 orbiting 56 ringed planet 55 Iapetus 55 interstellar dust 55 neutrinos 55 Very Large Telescope 55 astrophysicists 55 supernovas 55 Solar System 55 cosmic ray 55 Kuiper Belt 55 suns 55 deuterium 55 moon Titan 54 positrons 54 Pluto 54 nebulae 54 supermassive black holes 54 cosmic microwave background 54 interstellar medium 54 NASA Cassini spacecraft 54 Astronomers 54 X ray Observatory 54 Cassini spacecraft 54 gravitational waves 54 hydrogen atoms 54 Astrophysical Journal Letters 53 celestial objects 53 Cassiopeia 53 cosmic rays 53 outer planets 53 WMAP 53 hydroxyl 52 Alpha Centauri 52 asteroids 52 Cassini 52 corona 52 asteroid 52 atoms 52 spectra 52 dwarf planet 52 celestial bodies 51 olivine 51 Astrophysical Journal 51 LCROSS 51 water vapor 51 GRB