Related by context. Frequent words. (Click for all words.) 61 extrasolar planet 60 exoplanet 57 XMM Newton 57 extrasolar planets 57 Spitzer Space Telescope 56 exoplanets 56 astronomers 55 galaxy cluster 54 planets orbiting 54 ESO Very Large Telescope 54 brown dwarfs 54 NASA Chandra 54 HD #b [002] 53 globular clusters 53 brown dwarf 53 Orion Nebula 53 X ray Observatory 53 Large Magellanic Cloud 52 planet orbiting 52 THEMIS 52 Very Large Telescope 52 gamma ray burst 51 elliptical galaxies 51 MESSENGER 51 quasars 51 Gliese 51 WM Keck Observatory 51 super Earths 51 gamma ray bursts 51 Astronomers 50 GRBs 50 Sedna 50 Space Telescope 50 galaxy clusters 50 HiRISE 49 optical telescopes 49 dwarf galaxy 49 X ray emission 49 NASA Cassini spacecraft 49 redshift 49 supernovae 49 SDSS 49 quasar 49 unaided eye 49 rocky planets 48 distant galaxy 48 ESO 48 spectroscopic 48 terrestrial planets 48 UB# [003] 48 distant galaxies 48 infrared wavelengths 48 pulsars 47 GRB 47 interferometry 47 IceCube 47 neutrino 47 ejecta 47 planets 47 IAU 47 Milky Way Galaxy 47 Kepler 47 asteroid 46 hot Jupiters 46 comet nucleus 46 cosmic ray 46 Cassini spacecraft 46 cosmic microwave background 46 HESS 46 gravitational lensing 46 celestial bodies 46 neutron star 46 Planck 46 STEREO 46 NASA Mars Reconnaissance 46 Lutetia 46 Astrophysical Journal Letters 46 GOODS 45 galaxies 45 adaptive optics 45 infrared telescope 45 Astrophysical Journal 45 astrophysicists 45 amateur astronomers 45 astronomer 45 Saturn moons 45 astronomical observations 45 occultation 45 asteroids 45 sunspot 45 supernova 45 Spectrometer 45 geomagnetic 45 Eta Carinae 44 ringed planet 44 dwarf galaxies 44 supernova explosion 44 ALMA 44 Saturn rings 44 planetary 44 Milky Way galaxy