Related by context. Frequent words. (Click for all words.) 73 exoplanets 72 extrasolar planets 70 planets orbiting 70 brown dwarfs 68 extrasolar planet 67 exoplanet 66 rocky planets 66 planets 66 HD #b [002] 66 planet orbiting 64 pulsars 64 globular clusters 64 brown dwarf 63 elliptical galaxies 63 quasars 63 supernovae 62 spiral galaxies 62 redshift 61 galaxy cluster 61 dwarf galaxies 61 astronomers 61 distant galaxy 61 quasar 61 gamma ray bursts 60 celestial objects 60 galaxies 60 Milky Way Galaxy 60 orbits 60 gamma ray burst 60 Gliese 59 Milky Way galaxy 59 nebulae 59 galaxy clusters 59 supernova 58 Earth asteroids 58 unaided eye 58 Sedna 58 supernovas 58 distant galaxies 58 neutron star 57 asteroids 57 habitable zone 57 comets 57 Betelgeuse 57 moons 57 XMM Newton 56 neutron stars 56 celestial bodies 56 supernova explosion 56 fainter 56 infrared wavelengths 55 Saturn moons 55 sunspots 55 Milky Way 55 Saturn rings 55 Spitzer Space Telescope 55 supermassive black holes 55 astrophysicists 54 pulsar 54 neutrinos 54 Perseids 54 Astronomers 54 gamma rays 54 galaxy 54 spiral galaxy 54 sunspot 54 gravitational waves 54 nebula 54 Kuiper Belt 54 telescopes 54 supermassive black hole 54 cosmic ray 53 neutrino 53 orbiting 53 comet 52 cosmic rays 52 observatories 52 Enceladus 52 auroras 52 dwarf planets 52 Very Large Telescope 52 abundances 52 X ray Observatory 52 asteroid 52 spectroscopic 52 UB# [003] 52 meteor showers 51 meteors 51 orbiting spacecraft 51 WMAP 51 cosmologists 51 planetary 51 astrophysical 51 magnetosphere 51 interstellar dust 51 ringed planet 51 solar flares 51 outer planets 50 cosmic microwave background 50 Saturn moon 50 earths