Related by context. Frequent words. (Click for all words.) 53 planets orbiting 52 HD #b [002] 51 planet orbiting 50 extrasolar planet 50 extrasolar planets 49 brown dwarf 48 exoplanet 47 astronomers 47 supernova 47 GRBs 46 quasars 46 astronomer 46 planets 46 Kepler 46 neutron star 46 pulsars 46 Sedna 46 pulsar 45 brown dwarfs 45 terrestrial planets 45 neutrino 45 globular clusters 45 cometary 45 exoplanets 45 astrophysicists 45 Lowell Observatory 44 planetary scientist 44 spectroscopic 44 gamma ray burst 44 elliptical galaxies 44 astrophysical 44 supernova explosion 44 interstellar medium 44 XMM Newton 44 rocky planets 43 distant galaxy 43 ejecta 43 Borucki 43 quasar 43 interstellar dust 43 Saturn rings 43 Astrophysical Journal 42 Milky Way galaxy 42 galaxy cluster 42 moons 42 Planck 42 Milky Way Galaxy 42 Astrophysical Journal Letters 42 galaxy clusters 42 infrared wavelengths 42 THEMIS 42 gamma ray 41 cosmologists 41 distant galaxies 41 WMAP 41 supernovas 41 astrophysics 41 gamma ray bursts 41 gravitational lensing 41 astronomy 41 fainter 41 nebula 41 gamma rays 41 Charon 41 HiRISE 41 comet 41 planetary 41 heliosphere 41 galaxies 41 supernovae 40 interstellar space 40 comets 40 Spitzer Space Telescope 40 Pluto 40 planetary science 40 cosmologist 40 neutron stars 40 Milky Way 40 Saturn moons 40 general relativity 40 cosmic ray 40 gravitational waves 40 Kuiper Belt 40 spiral galaxies 40 WM Keck Observatory 40 asteroids 40 supermassive black hole 40 Phobos 40 physicist 40 neutrinos 39 LCROSS 39 magnetic fields 39 nebulae 39 dwarf galaxies 39 UB# [003] 39 STEREO 39 galaxy 39 asteroid 39 biophysicist 38 optical telescopes 38 physicists