Related by context. Frequent words. (Click for all words.) 64 planet orbiting 63 exoplanets 63 brown dwarf 62 brown dwarfs 61 planets orbiting 60 habitable zone 59 extrasolar planets 58 exoplanet 58 rocky planets 56 orbits 55 gamma ray burst 55 distant galaxy 55 UB# [003] 55 Sedna 54 quasar 53 supernova 53 planets 53 Milky Way galaxy 52 Alpha Centauri 52 redshift 52 Kuiper Belt 52 pulsar 52 pulsars 51 Enceladus 51 Betelgeuse 51 astronomers 51 spiral galaxy 51 neutron star 50 dwarf galaxies 50 quasars 50 Milky Way 50 dwarf planet 50 orbiting 50 galaxies 49 fainter 49 Uranus 49 supernovae 48 Spitzer Space Telescope 48 gamma ray bursts 48 nebula 48 suns 48 comet 47 neutron stars 47 asteroid 47 moons 47 galaxy clusters 47 XMM Newton 47 supermassive black hole 47 Cassiopeia 47 Astronomers 46 galaxy 46 infrared wavelengths 46 sunspot 46 comets 46 Saturn moon 46 Perseids 46 orbited 46 Saturn rings 45 Iapetus 45 Pluto 45 nova 45 ringed planet 45 X ray Observatory 45 Pleiades 45 distant galaxies 45 asteroids 45 supermassive black holes 44 celestial objects 44 corona 44 Cassini 44 astrophysicists 44 Earths 43 Solar System 43 Astrophysical Journal 43 quark 43 cosmic microwave background 43 neutrino 43 planetary 43 asteroid belt 43 aurora 43 sunspots 43 Astrophysical Journal Letters 43 moon Titan 43 Cassini spacecraft 42 astronomer 42 Kepler 42 SDSS 42 oscillations 42 elliptical orbit 42 Very Large Telescope 42 celestial bodies 42 supernovas 42 meteors 41 infrared radiation 41 nebulae 41 atoms 41 Higgs boson 41 luminosity 41 interstellar dust 41 Io 41 Halley Comet