Related by context. Frequent words. (Click for all words.) 74 XMM Newton 69 X ray emission 63 gravitational lensing 62 NASA Chandra 61 spectroscopic 61 NASA Cassini spacecraft 61 astronomers 60 GRBs 60 magnetar 60 Very Large Telescope 60 ESO Very Large Telescope 60 X ray Observatory 60 COROT 59 gamma ray burst 59 infrared wavelengths 59 quasars 59 astronomical objects 58 extrasolar planet 58 Cassini 58 extrasolar planets 58 comet nucleus 58 Global Surveyor 58 Eta Carinae 58 optical telescopes 57 gamma ray bursts 57 auroral 57 redshift 57 elliptical galaxies 57 interstellar dust 57 supernova remnant 57 supernova explosion 57 adaptive optics 57 distant galaxies 56 spectra 56 Hinode 56 TRMM 56 occultation 56 Very Large Array 56 pulsars 56 interferometry 56 dwarf galaxy 56 Orion Nebula 56 astronomical observations 56 cosmic microwave background 55 THEMIS 55 WMAP 55 galaxy clusters 55 supernovae 55 NASA Aqua 55 quasar 55 Spectrometer 55 gravitational waves 55 gravitational wave 55 distant galaxy 55 globular clusters 55 neutrino 55 pulsar 55 infrared spectrometer 55 ESA Mars 55 confocal 55 Earth magnetosphere 55 cometary 55 infrared telescope 55 CloudSat 55 IceCube 55 Solar Dynamics 54 photometric 54 Space Telescope 54 supernova 54 spatial resolution 54 HD #b [002] 54 cosmic ray 54 Saturn rings 54 neutron star 54 Spitzer Space Telescope 54 planets orbiting 54 astrophysical 54 Mars Reconnaissance Orbiter 54 orbiting spacecraft 54 WM Keck Observatory 54 Fluorescence 54 FRET 54 telescope 54 supernova explosions 54 Saturn moon Enceladus 53 Cassini spacecraft 53 exoplanet 53 STEREO 53 gamma ray 53 exoplanets 53 celestial objects 53 ICESat 53 orbiting telescope 53 Chandra X ray 53 Planck 53 interstellar medium 53 gamma rays 53 planet orbiting 53 dwarf galaxies 53 brown dwarf 53 NASA Mars Odyssey