Related by context. Frequent words. (Click for all words.) 70 XMM Newton 65 X ray Observatory 65 COROT 64 NASA Chandra 63 infrared telescope 62 Very Large Telescope 62 astronomers 62 Spitzer Space Telescope 61 microlensing 61 optical telescope 61 gravitational lensing 60 Cassini Huygens 60 telescope 60 distant galaxy 59 ESO Very Large Telescope 59 distant galaxies 59 astronomical observations 59 gamma ray burst 59 spacecraft 59 supernova remnant 59 Cassini 59 magnetar 58 extrasolar planet 58 NASA Kepler 58 Space Telescope 58 spectroscopic 58 gravitational wave 58 astrophysical 58 astrophysicists 58 Crab Nebula 58 NASA Cassini spacecraft 58 Spectrometer 58 optical telescopes 58 extrasolar planets 57 X ray emission 57 WM Keck Observatory 57 globular clusters 57 Mars orbiter 57 adaptive optics 57 WMAP 57 planets orbiting 57 planetary missions 57 CloudSat 56 quasars 56 spectrograph 56 observatories 56 JWST 56 comet nucleus 56 celestial object 56 Cassini spacecraft 56 GLAST 56 telescopes 56 astronomical objects 56 galaxy formation 56 interferometer 56 Hinode 56 exoplanets 56 supernova explosion 56 Earth magnetosphere 56 orbiting telescope 56 globular cluster 56 Kepler telescope 56 Eta Carinae 56 Mars Pathfinder 56 Cancri 56 orbiting 56 GRBs 55 galaxy cluster 55 interferometry 55 Hubble Telescope 55 accretion disk 55 Einstein theory 55 orbiting observatory 55 EPOXI 55 Milky Way Galaxy 55 OGLE 55 CALIPSO 55 galaxy clusters 55 redshift 55 gamma ray bursts 55 Gravity Probe B 55 Astronomers 55 cosmic ray 55 supernova 55 dwarf galaxy 54 supernovae 54 planet orbiting 54 THEMIS 54 Hubble Space Telescope 54 GOCE 54 infrared wavelengths 54 optical microscopy 54 gravitational waves 54 Chandra X ray 54 HD #b [002] 53 Mimas 53 cometary 53 exoplanet 53 Saturn rings 53 Mars Reconnaissance Orbiter 53 quasar