Related by context. Frequent words. (Click for all words.) 65 habitable planets 65 habitable planet 65 Earthlike 63 distant galaxy 62 Gamma ray bursts 62 habitable zones 61 terrestrial planets 61 planets 61 planetary nebulae 61 WASP #b 61 Kuiper Belt objects 60 astronomical objects 60 rocky planets 59 solar corona 59 Andromeda Galaxy 59 circular orbits 59 outer planets 59 magnetars 59 extrasolar planets 59 interplanetary spacecraft 59 Kuiper belt 59 planets orbiting 58 Andromeda galaxy 58 active galactic nuclei 58 extrasolar planet 58 Saturn moons 58 globular clusters 58 planet Uranus 58 super Earths 57 SIRTF 57 innermost planet 57 Orion Nebula 57 globular cluster 57 galaxy 57 Jupiter Saturn 57 distant galaxies 57 exoplanets 57 noctilucent clouds 57 JPL manages 56 galaxies 56 nebulas 56 dwarf galaxies 56 ultraviolet wavelengths 56 planet orbits 56 asteroid Ceres 56 nebulae 56 asteroids 56 alien civilizations 56 geoid 56 GRBs 56 aurorae 56 planetary nebula 56 planet 56 Gliese #g 56 COROT 56 optical wavelengths 56 moon Europa 56 celestial bodies 56 radial velocity 56 meteoroids 55 exoplanet 55 brown dwarfs 55 supernova explosions 55 celestial object 55 orbiting Saturn 55 Cancri 55 Milky Way Galaxy 55 Oort Cloud 55 RQ# 55 planetoid 55 supernova explosion 55 planet orbiting 55 Keck telescope 55 orbiting 55 intelligent beings 55 moon Charon 54 pulsars 54 protoplanetary disk 54 supernovae 54 HD #b [002] 54 Solar System 54 planetary 54 Jupiter moons 54 Milky Way galaxy 54 planets circling 54 magnetar 54 celestial objects 54 robotic explorers 54 Cosmic rays 54 star Gliese 54 elliptical galaxies 54 dwarf galaxy 54 WIMPs 54 microlensing 54 orbiting planets 54 moonlets 54 Astrophysicists 54 robotic spacecraft 54 supernova remnants 53 Higgs particle 53 Mauna Kea Hawaii