Related by context. Frequent words. (Click for all words.) 52 Venusian 50 Kuiper belt 49 super Earths 49 rocky planets 48 constellation Leo 48 Sedna 48 Cancri 47 moons 47 planet orbits 47 Saturn rings 47 habitable planet 46 galaxy cluster 46 equatorial 46 volcanically active 46 planet orbiting 46 geologically active 46 Andromeda Galaxy 46 Andromeda galaxy 46 Jupiter moons 46 annular eclipse 46 Phaethon 46 Saturn moons 45 microlensing 45 unaided eye 45 asteroid 45 outer planets 45 Gliese #g 45 distant galaxy 45 sunspot cycle 45 solar nebula 45 Fomalhaut 45 planetary nebula 45 planetary nebulae 45 planets 45 globular cluster 45 planetoid 45 Gamma ray bursts 45 comet 44 occultation 44 Earth magnetosphere 44 equatorial regions 44 supercontinent 44 celestial object 44 equator 44 extrasolar planet 44 Galaxy Evolution 44 Saturn moon 44 planets orbiting 44 ecliptic 44 celestial 44 Comet Tempel 1 44 lithosphere 43 supermoon 43 solar corona 43 COROT 43 habitable planets 43 dwarf galaxy 43 gravitational tug 43 meteoroids 43 Haumea 43 astronomers 43 earths 43 Titan Saturn 43 Enceladus 43 elliptical galaxies 43 Mimas 43 interplanetary spacecraft 43 supernova explosion 43 equinoxes 43 orbiting 43 moon Charon 43 ejecta 43 radioactive decay 43 extrasolar planets 43 auroral 43 observable universe 42 equinox 42 dwarf galaxies 42 globular clusters 42 martian 42 Cassini 42 sunspot 42 perigee 42 moon Europa 42 cosmic 42 Andromeda 42 spacetime 42 X ray emission 42 solstices 42 meteoroid 42 Spitzer Space Telescope 42 Milky Way Galaxy 42 spring equinox 42 moon Titan 42 celestial bodies 42 spiral galaxies 42 thermosphere 42 nebula 42 magnetar 42 Crab Nebula 42 quasar