Related by context. Frequent words. (Click for all words.) 66 extrasolar planets 65 XMM Newton 64 extrasolar planet 64 astrophysical 64 COROT 63 planets orbiting 63 planetary 63 astronomical observations 63 exoplanet 63 moon Charon 63 astronomers 62 planets 62 Cancri 62 exoplanets 62 habitable planets 62 brown dwarfs 61 astronomical objects 61 HD #b [002] 61 gravitational wave 61 Earth magnetosphere 61 planet orbits 61 rocky planets 61 celestial objects 61 neutrino 60 Gliese #g 60 distant galaxy 60 substorms 60 celestial bodies 60 terrestrial planets 60 X ray emission 60 muon 60 outer planets 60 Jupiter moons 60 magnetar 60 galaxy formation 60 Cassini Huygens 60 subatomic particle 59 super Earths 59 planet orbiting 59 gravitational lensing 59 globular cluster 59 Kuiper belt 59 magnetosphere 59 cosmic ray 59 Saturn rings 59 cosmological 59 interstellar dust 59 celestial object 58 spectroscopic 58 brown dwarf 58 auroral 58 optical telescopes 58 Eta Carinae 58 Titan Saturn 58 interferometry 58 occultation 58 GRBs 58 astrobiologists 58 Cassini 58 cosmologists 58 ringed planet 58 Saturn moons 58 Andromeda galaxy 58 globular clusters 58 distant galaxies 58 accretion disk 58 quasars 58 quasar 57 galaxy cluster 57 Crab Nebula 57 ESO Very Large Telescope 57 IceCube 57 orbiting 57 Orion Nebula 57 gamma ray burst 57 comet nucleus 57 Milky Way Galaxy 57 orbiting telescope 57 adaptive optics 57 supernovae 57 pulsars 57 elliptical galaxies 57 NASA Kepler 57 X ray Observatory 57 optical telescope 57 astrophysicists 57 telescopes 57 supernova explosion 56 Cassini spacecraft 56 WM Keck Observatory 56 THEMIS 56 ionospheric 56 interferometer 56 comets 56 nebulae 56 comet 56 telescope 56 NASA Cassini spacecraft 56 asteroid 56 Spitzer Space Telescope 56 neutron stars