Related by context. Frequent words. (Click for all words.) 64 extrasolar planets 64 exoplanet 62 exoplanets 61 brown dwarf 60 UB# [003] 59 planet orbiting 59 distant galaxy 58 planets 58 brown dwarfs 57 Enceladus 57 planets orbiting 57 Kuiper Belt 56 rocky planets 56 nebula 56 pulsar 56 quasar 56 Milky Way 56 Betelgeuse 56 Saturn rings 55 NASA Cassini spacecraft 55 gamma ray burst 55 Pluto 55 neutron star 55 Milky Way galaxy 55 Iapetus 55 Gliese 54 Saturn moon 53 galaxy 53 Andromeda 53 moons 53 comet 53 Uranus 53 celestial bodies 53 Cassiopeia 53 dwarf galaxies 52 asteroid 52 pulsars 52 spiral galaxy 52 supernova 52 comets 52 galaxies 51 orbits 51 quasars 51 distant galaxies 51 Solar System 51 astronomers 50 elliptical orbit 50 XMM Newton 50 supermassive black hole 50 Charon 50 galaxy clusters 50 supernovae 50 redshift 50 Cassini 50 habitable zone 50 Vesta 49 Pleiades 49 Phobos 49 dwarf planet 49 ringed planet 49 asteroid belt 49 Ganymede 49 sunspot 48 moon Titan 48 heliosphere 48 Cassini spacecraft 48 Spitzer Space Telescope 48 interstellar space 48 gamma ray bursts 47 asteroids 47 equator 47 Perseids 47 Eris 47 Jupiter 47 Arcturus 47 Io 47 Earth 46 nebulae 46 fainter 46 infrared wavelengths 46 Halley Comet 46 Earths 46 Astronomers 46 starlight 46 X ray Observatory 46 sunspots 46 Apophis 45 planetary 45 Red Planet 45 volcanism 45 NASA Chandra 45 equatorial 45 cosmic microwave background 45 Martian surface 45 WMAP 44 magnetosphere 44 gravitational waves 44 supernovas 44 aurora 44 Saturn 44 ellipse