Related by context. Frequent words. (Click for all words.) 66 HD #b [002] 62 star Gliese 61 XMM Newton 61 Gliese #g 60 radial velocity 60 WASP #b 59 magnetars 59 Cancri 59 COROT 59 exoplanets 58 extrasolar planet 58 exoplanet 58 extrasolar planets 58 Galaxy Evolution 58 spacecraft orbiting 58 Jupiter Saturn 58 planets circling 57 super Earths 57 planets orbiting 57 moon Charon 57 Kuiper Belt objects 57 planetary nebulae 57 rocky planets 57 asteroid Ceres 57 interplanetary spacecraft 56 brown dwarfs 56 planet orbiting 56 moon Europa 56 astronomers 56 microlensing 56 active galactic nuclei 56 X ray emission 56 hot Jupiters 55 Spitzer Space Telescope 55 NASA Cassini 55 solar corona 55 habitable planets 55 Cassini Huygens 55 Very Large Telescope 55 NASA Kepler 55 NASA Chandra 55 planet orbits 55 Mauna Kea Hawaii 55 GRB # 55 OGLE 54 celestial bodies 54 Mini SAR 54 celestial object 54 EPOXI 54 Jupiter moons 54 astronomical objects 54 infrared telescope 54 NASA Cassini spacecraft 54 Haumea 54 planets 54 optical telescopes 54 Hubble observations 54 nebulae 54 Astrophysicists 54 Flyby 54 terrestrial planets 53 Cepheids 53 photometer 53 habitable zones 53 Voyager spacecraft 53 meteoroids 53 Orion Nebula 53 X ray Observatory 53 brown dwarf 53 aurorae 53 infrared wavelengths 53 GRBs 53 Sedna 53 habitable planet 53 innermost planet 53 astronomical observations 53 Edwin Hubble 53 distant galaxy 53 Kepler telescope 53 CALIPSO 53 Cassini orbiter 53 Gamma ray bursts 53 planetoid 53 journal Astronomy 53 Type Ia supernovae 53 elliptical galaxies 53 dwarf galaxies 52 Saturn moons 52 La Silla Chile 52 Venusian 52 supernova remnants 52 planetary missions 52 magnetar 52 Filippenko 52 galaxy formation 52 galaxy clusters 52 galaxy cluster 52 outer planets 52 Cosmic rays 52 comet 52 astrophysicists