Related by context. Frequent words. (Click for all words.) 59 extrasolar 59 Gamma ray bursts 57 habitable planets 57 Oort Cloud 57 icy moons 56 extraterrestrial civilizations 55 exoplanets 55 Earthlike 55 gaseous planets 55 Gliese #g 55 Oort cloud 55 magnetars 54 planets 54 CoRoT 7b 54 astronomical phenomena 54 Higgs particle 54 stellar nurseries 54 Jupiter moons 54 habitable planet 53 planetary nebulae 53 planet Uranus 53 lunar craters 53 radial velocity 53 Gamma rays 53 WASP #b 53 innermost planet 52 extrasolar planet 52 Saturn moons 52 subatomic particle 52 alien civilizations 52 Cosmologists 52 potentially habitable 52 planetoid 52 planets circling 52 ultraviolet wavelengths 52 Einstein theories 52 Cosmic rays 52 celestial bodies 52 astronomical objects 52 distant galaxy 52 intelligent beings 51 astronomical observations 51 Kuiper Belt objects 51 X ray telescopes 51 extrasolar planets 51 boson 51 galaxy formation 51 Kuiper belt 51 By Laurelle Gilbert 51 gravitationally bound 51 super Earths 51 interplanetary spacecraft 51 elliptical orbits 51 SIRTF 51 geoid 51 moon Enceladus 51 Hawking radiation 51 moon Charon 51 alien beings 51 BY VINCENT MAO 51 Martian rocks 51 antiparticles 50 planetary 50 rocky planets 50 substorm 50 interstellar 50 cosmic particles 50 solar corona 50 WIMPs 50 hot Jupiters 50 meteor impacts 50 orbiting Saturn 50 solar nebula 50 outer planets 50 aurorae 50 exosphere 50 particle physicists 50 HD #b [002] 50 moon Europa 50 novae 50 celestial objects 50 Galileo spacecraft 50 antihydrogen 50 polar craters 50 Cancri 50 faraway galaxies 50 photosphere 50 astrobiologists 50 Venusian 50 supercomputer simulations 50 Type Ia supernovae 50 Titan Saturn 50 robotic probes 49 Astrophysicists 49 heliopause 49 planets orbiting 49 GRBs 49 interstellar clouds 49 colliders 49 lifeform 49 orbiting Hubble Space Telescope