Related by context. Frequent words. (Click for all words.) 69 HD #b [002] 68 extrasolar planet 67 exoplanet 65 Gliese 64 rocky planets 64 planet orbiting 64 UB# [003] 64 exoplanets 64 brown dwarf 64 extrasolar planets 63 brown dwarfs 61 habitable zone 61 Sedna 61 galaxy cluster 60 planets 59 dwarf planet 58 distant galaxy 58 Betelgeuse 57 planets orbiting 57 gamma ray burst 57 supernova explosion 57 Enceladus 57 Pluto 56 terrestrial planets 56 dwarf planets 56 Kuiper Belt 55 astronomers 55 Saturn moons 55 quasar 55 asteroid 55 globular clusters 55 GRBs 55 sunspot 54 Saturn rings 54 neutrino 54 olivine 54 elliptical galaxies 54 supernova 54 Milky Way 54 Earths 54 Saturn moon 53 Milky Way galaxy 53 redshift 53 Milky Way Galaxy 53 XMM Newton 53 pulsar 52 dwarf galaxies 52 Astronomers 52 quasars 52 ejecta 52 supernovae 52 pulsars 51 orbiting 51 unaided eye 51 earths 51 Ophiuchus 51 comet 51 Spitzer Space Telescope 51 cosmic microwave background 51 astrophysicists 51 martian 51 asteroids 51 galaxy clusters 50 planetary 50 planet 50 comets 50 occultation 50 galaxies 50 cosmologists 50 moon Europa 50 supernovas 50 neutron star 49 gamma ray bursts 49 Astrophysical Journal Letters 49 spiral galaxy 49 astronomer 49 Iapetus 49 Earth asteroids 49 cosmic ray 49 Higgs boson 49 comet nucleus 49 orbits 49 optical telescopes 48 Uranus 48 Astrophysical Journal 48 nebula 48 astrobiology 48 perigee 48 Solar System 48 spacetime 48 galaxy 48 IAU 48 Kepler 48 interstellar medium 48 neutrinos 48 Martian 48 single celled 48 Meridiani Planum 47 celestial objects 47 moons 47 Cassini spacecraft