Related by context. Frequent words. (Click for all words.) 50 Gliese #g 48 celestial 47 UB# [003] 46 astronomers 46 dwarf planets 45 HD #b [002] 44 planetary 44 Jupiter moons 44 habitable planet 44 dwarf planet 44 planets 44 Pluto 44 cosmic 44 super Earths 43 extrasolar planet 42 magnetar 42 orbiting 41 celestial bodies 41 asteroid 41 COROT 41 meteoroid 41 extrasolar planets 41 planet 41 IAU 40 Carl Sagan 40 Uranus 40 Sedna 40 outer planets 40 Kuiper belt 40 accreting 40 anthropogenic global warming 40 moon 40 brown dwarf 40 celestial object 40 planet orbiting 40 Saturn moons 40 Eta Carinae 39 Andromeda Galaxy 39 International Astronomical 39 cosmologists 39 Gliese 39 constellation 39 exoplanets 39 vernal equinox 39 comet 39 earths 39 asteroids 39 Apophis 39 cosmological 39 supernova 39 moon Charon 38 astronomy 38 distant galaxy 38 Saturn moon 38 astrobiologists 38 martian 38 Ophiuchus 38 brown dwarfs 38 habitable planets 38 Martian 38 lunar 38 NEOs 38 moons 38 astronomical observatory 38 supernova explosion 38 meteor 38 astrophysicists 38 Pleiades 38 polar 38 Saturn rings 38 particle physicists 38 moon Europa 38 manmade global warming 38 globular cluster 38 ancients 38 planets orbiting 38 extraterrestrial 37 NASA Kepler 37 galactic 37 Thirty Meter Telescope 37 ellipse 37 cosmic ray 37 transmutation 37 physicists 37 outer space 37 primordial 37 Crab Nebula 37 astronomical observations 37 polar caps 37 ringed planet 37 astronomer 37 Lutetia 37 astrobiology 37 Halley Comet 36 Milky Way Galaxy 36 equinox 36 Ursa Major 36 comets 36 Earth asteroids 36 cosmos 36 occultation