Related by context. Frequent words. (Click for all words.) 65 dwarf planet 60 Sedna 60 dwarf planets 57 exoplanet 56 HD #b [002] 56 Pluto 55 planet orbiting 55 Gliese 54 brown dwarf 54 exoplanets 54 extrasolar planet 53 Kuiper Belt 53 brown dwarfs 52 extrasolar planets 51 rocky planets 50 Eris 50 habitable zone 50 redshift 49 planets orbiting 49 galaxy cluster 49 astronomers 47 asteroid 47 globular clusters 47 IAU 46 planets 46 Higgs boson 46 Milky Way Galaxy 46 orbits 45 distant galaxy 45 Betelgeuse 45 International Astronomical 45 moon Titan 44 Astrophysical Journal 44 Saturn rings 44 Xena 44 Saturn moon 44 quasar 44 perigee 44 quasars 44 pulsars 44 Astronomers 44 elliptical galaxies 43 Apophis 43 Asteroid 43 supernova 43 Earth asteroids 43 Enceladus 43 infrared wavelengths 43 Uranus 43 moons 43 supernova explosion 43 Space Telescope 42 spiral galaxy 42 asteroids 42 orbiting 42 Itokawa 42 Spitzer Space Telescope 42 Astrophysical Journal Letters 42 dwarf galaxies 42 NEOs 42 gamma ray burst 42 unaided eye 42 galaxy clusters 41 SDSS 41 Saturn moons 41 celestial objects 41 Solar System 41 pulsar 41 outer planets 41 neutron star 41 XMM Newton 41 olivine 41 Mars Odyssey 41 X ray Observatory 41 Milky Way 40 neutron stars 40 fainter 40 Kepler 40 Milky Way galaxy 40 asteroid belt 40 Pleiades 40 Perseids 40 WMAP 40 Cassini spacecraft 40 nebula 39 interstellar dust 39 cosmologists 39 Iapetus 39 gamma ray bursts 39 astronomer 39 Planck 39 NASA Chandra 39 elliptical orbit 39 comet 39 vernal equinox 39 planetary 39 Phobos 39 celestial bodies 39 Einstein theory 39 orbited 39 NASA Cassini spacecraft