Related by context. Frequent words. (Click for all words.) 68 dwarf planet 67 dwarf planets 61 UB# [003] 56 Pluto 56 HD #b [002] 55 Sedna 54 brown dwarf 51 rocky planets 51 planet orbiting 51 planets 51 dwarf galaxy 50 terrestrial planets 49 exoplanet 49 International Astronomical 49 Gliese 49 brown dwarfs 49 extrasolar planet 49 Kuiper Belt 49 asteroid 48 extrasolar planets 48 celestial bodies 48 astronomers 47 IAU 47 dwarf galaxies 47 exoplanets 47 habitable zone 47 Ophiuchus 47 gamma ray burst 46 supernova 46 Jupiter Saturn Uranus 46 super Earths 46 Milky Way Galaxy 46 asteroids 46 moon Europa 46 galaxy cluster 46 outer planets 45 planetary 45 moons 45 gravitationally 45 ejecta 45 spiral galaxy 45 Astronomers 45 planets orbiting 45 gravitational lensing 45 comets 45 distant galaxy 45 NEOs 45 globular clusters 44 supernovae 44 olivine 44 celestial objects 44 spiral galaxies 44 Solar System 44 astrophysicists 44 comet 44 comet nucleus 44 intelligent beings 43 supernova explosion 43 Eta Carinae 43 Milky Way 43 supernova explosions 43 planet 43 Orion Nebula 43 elliptical galaxies 43 astronomer 43 occultation 42 quasar 42 Halley Comet 42 neutron star 42 pulsar 42 unaided eye 42 galaxies 42 regolith 42 nebula 42 quasars 42 celestial 42 redshift 42 orbits 42 galactic 42 asteroid belt 42 pulsars 41 galaxy 41 gravitational waves 41 Saturn rings 41 Earth asteroids 41 Alpha Centauri 41 Lutetia 41 Apophis 41 Tombaugh 41 earths 41 spacetime 41 neutron stars 41 silicates 41 Higgs boson 41 Enceladus 41 Carl Sagan 41 Asteroid 41 Uranus 41 Pleiades 40 GRBs 40 universe