Related by context. Frequent words. (Click for all words.) 67 rocky planets 65 brown dwarfs 65 planets 65 super Earths 64 brown dwarf 64 extrasolar planets 64 globular clusters 63 elliptical galaxies 63 terrestrial planets 63 exoplanets 62 planets orbiting 62 hot Jupiters 61 HD #b [002] 61 exoplanet 61 GRBs 61 Jupiter moons 60 quasars 60 spiral galaxies 60 dwarf galaxies 59 supernova explosion 59 planet orbiting 59 celestial bodies 59 distant galaxy 59 extrasolar planet 58 Milky Way galaxy 58 Milky Way Galaxy 58 Saturn rings 58 dwarf galaxy 58 moon Europa 58 distant galaxies 58 galaxies 58 Kuiper Belt 58 supernovas 57 outer planets 57 Sedna 57 supernova explosions 57 astronomers 57 COROT 57 Saturn moons 57 comet nucleus 57 comets 57 Eta Carinae 57 galaxy clusters 57 Orion Nebula 56 neutron stars 56 pulsars 56 gamma ray burst 56 XMM Newton 56 X ray emission 56 planetary 56 pulsar 55 Saturn moon 55 ecliptic 55 gamma ray bursts 55 moons 55 supernovae 55 neutron star 55 dwarf planets 54 nebulae 54 interstellar dust 54 Jupiter Saturn Uranus 54 X ray Observatory 54 quasar 54 Spitzer Space Telescope 54 galaxy cluster 54 astrophysicists 54 CMEs 54 Large Magellanic Cloud 54 supermassive black holes 54 astronomical observations 54 magnetosphere 54 Earth asteroids 54 quark gluon plasma 54 gravitational lensing 53 accreting 53 Milky Way 53 Cassini Huygens 53 gravitationally 53 Enceladus 53 cosmic ray 53 NASA Cassini spacecraft 53 orbits 53 ejecta 53 robotic spacecraft 53 interstellar medium 53 asteroids 53 asteroid 53 ringed planet 53 comet 53 NASA Chandra 53 muons 53 celestial objects 53 nebula 53 redshift 52 cosmologists 52 nuclei 52 atomic nuclei 52 supermassive black hole 52 neutrino 52 supernova remnant 52 gravitational wave