Related by context. Frequent words. (Click for all words.) 64 extrasolar planet 64 rocky planets 63 habitable planets 63 super Earths 62 planets orbiting 62 extrasolar planets 62 habitable planet 61 terrestrial planets 61 planets 60 Gliese #g 60 Saturn moons 60 HD #b [002] 60 brown dwarfs 59 exoplanet 59 Kuiper belt 58 exoplanets 58 Meridiani 58 hot Jupiters 57 volcanically active 57 astronomical objects 57 Saturn moon 57 planet orbiting 56 astrobiologists 56 comets 56 moon Europa 56 brown dwarf 55 distant galaxies 55 polar caps 55 dwarf galaxies 55 equatorial regions 55 Crab Nebula 55 Sedna 55 meteoroids 55 WIMPs 55 quark gluon plasma 55 Solar System 55 Saturn rings 54 distant galaxy 54 Titan Saturn 54 Kuiper Belt 54 Milky Way galaxy 54 ionized gas 54 moon Charon 53 Andromeda Galaxy 53 globular clusters 53 unaided eye 53 ejecta 53 organic molecules 53 Andromeda galaxy 53 planet orbits 53 dwarf planets 53 Jupiter moons 53 magnetar 53 Orion Nebula 53 silicates 53 GRBs 53 Jupiter Saturn 53 moon Titan 53 elliptical galaxies 53 galaxy formation 53 supernova explosion 53 UB# [003] 52 geologically active 52 X ray emission 52 interstellar dust 52 infrared wavelengths 52 Martian landscape 52 Cancri 52 lifeforms 52 asteroids 52 Martian surface 52 Milky Way Galaxy 52 astronomers 52 zircons 52 lunar poles 52 quasars 52 earths 52 neutron stars 52 Iapetus 52 extremophiles 52 celestial bodies 52 supernova explosions 52 gamma ray burst 52 comet 52 optical telescopes 52 COROT 51 pulsars 51 Geminids 51 outer planets 51 planet 51 subatomic particle 51 lavas 51 moons 51 gravitational lensing 51 olivine 51 interstellar medium 51 supernovae 51 spacetime 51 comet nucleus 51 nebulae 51 dwarf galaxy