Related by context. Frequent words. (Click for all words.) 62 Epsilon Eridani 61 planet Uranus 59 Jupiter moons 59 extrasolar 58 icy moons 58 Earthlike planets 58 moon Europa 57 nebulas 57 Jupiter Saturn 57 interplanetary spacecraft 57 JPL manages 56 Saturnian system 56 Herschel Space 56 gaseous planets 56 outer planets 56 nebulae 56 planets orbiting stars 56 spacecraft orbiting 56 Sara Seager 55 GALEX 55 infrared telescopes 55 Kepler #b 55 SIRTF 54 Exoplanet 54 Astrophysicists 54 planets 54 solar corona 54 moon Charon 54 star Gliese 54 photosphere 54 Galaxy Evolution 54 COROT 54 earthshine 54 noctilucent clouds 53 habitable planets 53 Amateur astronomers 53 Cosmic rays 53 VIRTIS 53 Venusian 53 Magellanic Clouds 53 galactic cosmic rays 53 ultracold atoms 53 extragalactic 53 Kuiper belt 53 celestial 53 aurorae 53 Fomalhaut 53 coronagraph 53 active galactic nuclei 53 ultraviolet wavelengths 53 Einstein theories 53 lunar craters 53 Earthlike 52 orbiting Hubble Space Telescope 52 Uranus 52 Wilkinson Microwave Anisotropy Probe 52 Keck telescope 52 innermost planet 52 millisecond pulsars 52 X ray telescopes 52 faraway galaxies 52 Gamma ray bursts 52 constellation Virgo 52 Jupiter Saturn Uranus 52 planetary nebulae 52 extrasolar planet 52 transiting planets 52 moons 52 Kuiper Belt objects 52 extrasolar planets 52 protostars 52 polar craters 52 Saturn moons 52 habitable zones 52 celestial object 52 transiting planet 52 NASA Cassini 52 elliptical orbits 52 ringed planet 52 Oort Cloud 52 moon Enceladus 52 planetary atmospheres 51 distant galaxy 51 exosphere 51 celestial bodies 51 astronomical objects 51 permanently shadowed craters 51 Neutron stars 51 radial velocity 51 constellation Sagittarius 51 Nibiru 51 Cancri 51 XMM Newton 51 AGNs 51 constellation Lyra 51 Lyman alpha 51 Terrestrial Planet Finder 51 magnetars 51 Gliese #g 51 Saturn moon 51 planets circling