Related by context. Frequent words. (Click for all words.) 63 extrasolar planet 61 interplanetary spacecraft 60 Gliese #g 60 Andromeda galaxy 60 WASP #b 60 extrasolar planets 59 Galaxy Evolution 59 microlensing 59 planets circling 59 planets 59 exoplanets 58 planet orbiting 58 planetary 58 exoplanet 58 NASA Kepler 58 planets orbiting 57 supernova explosion 57 terrestrial planets 57 Cassini Huygens 57 Oort Cloud 57 planet orbits 57 moon Charon 57 galaxy formation 56 XMM Newton 56 Hubble Telescope 56 rocky planets 56 radial velocity 56 super Earths 56 solar corona 56 COROT 56 Solar System 56 galaxy cluster 55 HD #b [002] 55 planetoid 55 Titan Saturn 55 Spitzer Space Telescope 55 Kuiper belt 55 Saturn moons 55 subatomic particle 55 hydrothermal vent 55 habitable planets 55 NASA Stardust spacecraft 55 magnetar 55 magnetars 55 Saturn moon 55 distant galaxy 55 Higgs particle 55 gamma ray 55 innermost planet 55 quasars 55 interstellar dust 54 habitable planet 54 gravitational wave 54 outer planets 54 Voyager spacecraft 54 orbiting 54 Orion Nebula 54 Milky Way galaxy 54 planet 54 brown dwarfs 54 God Particle 54 dwarf galaxy 54 pulsar 54 Jupiter moons 54 galactic 54 La Silla Chile 54 astronomers 54 pulsars 54 Pan STARRS 54 galaxies 54 astrophysical 53 Andromeda Galaxy 53 orbiting Saturn 53 gamma ray burst 53 spacecraft orbiting 53 Gamma ray bursts 53 infrared telescope 53 Milky Way Galaxy 53 Galileo spacecraft 53 Cancri 53 cosmos 53 moonlets 53 GRB # 53 NASA Cassini 53 neutrino 53 elliptical galaxies 53 Saturn rings 53 X ray telescope 53 globular clusters 53 supernovae 53 spectroscopic 53 astrobiologists 53 comets 53 Lunar Prospector 53 Cosmologists 53 ringed planet 53 solar nebula 53 HiRISE camera 53 colliding galaxies 53 comet 53 Cassini radar