Related by context. Frequent words. (Click for all words.) 70 rocky planets 62 brown dwarf 61 brown dwarfs 60 exoplanets 60 Gliese 60 planets orbiting 60 exoplanet 59 planets 57 extrasolar planets 56 Kuiper Belt 55 Enceladus 54 planet orbiting 50 Sedna 50 UB# [003] 50 orbits 49 Milky Way galaxy 49 infrared wavelengths 48 redshift 48 quasar 48 habitability 47 asteroids 47 quasars 47 galaxies 47 comets 47 Meridiani Planum 47 Solar System 46 Milky Way 46 neutron star 46 organic molecules 46 supernovae 46 asteroid belt 46 hydrothermal vents 46 Saturn moon 46 nebulae 45 galaxy clusters 45 supernova 45 supermassive black hole 45 habitable 45 gamma ray burst 45 supermassive black holes 45 dwarf galaxies 44 Earths 44 gamma ray bursts 44 dwarf planet 44 distant galaxy 44 distant galaxies 43 neutron stars 43 galaxy 43 equator 43 deuterium 43 nebula 42 Spitzer Space Telescope 42 Kepler 42 spiral galaxy 42 celestial objects 42 asteroid 42 Astronomers 42 moons 42 hydroxyl 41 fainter 41 magnetosphere 41 comet 41 pulsars 41 astrobiology 41 Astrophysical Journal 41 nuclei 40 moon Titan 40 planetary 40 hematite 40 Mars 40 GRB 40 polar regions 40 supernovas 40 Higgs boson 40 hydrogen atoms 39 planet 39 astronomers 39 neutrino 39 organic compounds 39 infrared radiation 39 atoms 39 elliptical orbit 39 celestial bodies 39 suns 39 meteorites 39 Martian surface 39 martian 38 radii 38 equatorial 38 northern latitudes 38 interstellar space 38 atmospheres 38 sunspot 38 Uranus 38 pulsar 38 Iapetus 38 ellipse 38 planetary scientist 38 gravitational waves 38 corona 37 astrophysical