Related by context. Frequent words. (Click for all words.) 57 dwarf planet 57 UB# [003] 56 Pluto 53 IAU 52 astronomers 51 International Astronomical 51 dwarf planets 48 planets 48 HD #b [002] 46 anthropogenic global warming 46 Sedna 46 exoplanet 45 asteroid 45 super Earths 45 extrasolar planet 45 Tombaugh 45 planetary 45 exoplanets 45 planet orbiting 44 manmade global warming 44 brown dwarf 44 distant galaxy 44 Uranus 44 astrophysicists 44 Eta Carinae 44 cosmologists 44 astrobiology 44 supernova explosion 43 cosmological constant 43 galactic 43 Astronomers 43 outer planets 42 Carl Sagan 42 brown dwarfs 42 planets orbiting 42 orbiting 41 Big Bang theory 41 cosmic 41 neutron star 41 cosmological 41 planet 41 Saturn moons 41 Xena 41 extrasolar planets 41 Ophiuchus 40 asteroids 40 Galileo Galilei 40 neutron stars 40 dwarf galaxy 40 Einstein theory 40 Milky Way Galaxy 40 gravitationally 40 Kepler 40 Gliese 40 planetary science 40 WM Keck Observatory 40 celestial 40 celestial bodies 40 Kuiper Belt 40 terrestrial planets 40 WMAP 40 XMM Newton 39 supernova 39 pulsar 39 pulsars 39 Saturn moon 39 ringed planet 39 astrophysical 39 astronomy 39 Hubble telescope 39 galaxy clusters 39 X ray Observatory 39 galaxy cluster 38 moon Europa 38 astronomer 38 Eris 38 gravitational waves 38 rocky planets 38 moons 38 universe 38 cosmic dust 38 elliptical galaxies 38 Hubble 38 Lowell Observatory 38 comet 38 gamma ray burst 38 Apophis 38 Borucki 38 moon 38 supernova explosions 38 NASA Chandra 37 extraterrestrial 37 Enceladus 37 fainter 37 anthropogenic climate 37 physicists 37 Raelians 37 Copernican 37 cosmic ray 37 meteor 37 SDSS