Related by context. Frequent words. (Click for all words.) 69 Kuiper belt 66 terrestrial planets 65 globular clusters 65 extrasolar planets 65 brown dwarfs 64 elliptical galaxies 64 super Earths 64 globular cluster 64 planets orbiting 64 planets 64 astronomical objects 64 HD #b [002] 64 X ray emission 64 astronomers 63 magnetar 63 ejecta 63 rocky planets 62 outer planets 62 GRBs 62 exoplanets 62 planet orbits 62 dwarf galaxies 61 habitable planets 61 spherules 61 galaxy formation 61 hot Jupiters 61 quasars 61 microlensing 60 Sedna 60 moon Charon 60 Saturn rings 60 extrasolar planet 60 Gliese #g 60 meteoroids 60 Cancri 60 Earth magnetosphere 59 distant galaxy 59 Orion Nebula 59 Milky Way Galaxy 59 Kuiper Belt 59 Gamma ray bursts 59 spacetime 59 COROT 59 dwarf galaxy 59 spiral galaxies 59 planet orbiting 59 dwarf planets 59 galaxy cluster 59 supernova remnant 59 astrophysicists 59 distant galaxies 58 supernova explosions 58 WIMPs 58 pulsars 58 brown dwarf 58 nebulae 58 Eta Carinae 58 gravitational lensing 58 redshift 58 exoplanet 58 Andromeda galaxy 58 auroral 58 planetoid 58 cosmologists 58 galaxies 58 astrophysical 58 celestial object 58 visible wavelengths 58 interstellar dust 58 XMM Newton 58 galaxy clusters 58 supernovae 58 supernova explosion 57 meteoroid 57 planetary 57 Jupiter moons 57 neutron stars 57 morphologies 57 comet nucleus 57 asteroids 57 celestial objects 57 gravitational wave 57 moons 57 optical telescopes 57 Saturn moons 57 comets 57 observable universe 56 Iapetus 56 accretion disk 56 unaided eye 56 infrared wavelengths 56 magnetosphere 56 Andromeda Galaxy 56 interplanetary spacecraft 56 heliosphere 56 Mimas 56 celestial bodies 56 orbits 56 gravitationally 56 Milky Way galaxy 56 muons