Related by context. Frequent words. (Click for all words.) 68 astronomers 68 Space Telescope 68 Very Large Telescope 66 infrared wavelengths 66 gamma ray burst 66 spectroscopic 66 gamma ray bursts 66 NASA Chandra 66 quasars 65 extrasolar planets 65 distant galaxies 65 NASA Cassini spacecraft 64 Spitzer Space Telescope 64 X ray Observatory 63 quasar 63 redshift 63 Cassini 63 distant galaxy 62 WMAP 62 exoplanets 61 astrophysical 60 Hubble Space Telescope 60 exoplanet 60 galaxy clusters 60 Cassini spacecraft 60 astrophysicists 60 pulsars 60 Spectrometer 60 globular clusters 59 galaxies 59 Telescope 59 planets orbiting 59 supernovae 59 spectra 59 Planck 59 gamma ray 59 cosmic microwave background 59 cosmic rays 59 Advanced Camera 58 interferometer 58 telescope 58 pulsar 58 gravitational waves 58 nebulae 58 Gamma Ray 58 Solar System 57 brown dwarfs 57 Hubble Telescope 57 celestial objects 57 GLAST 57 nebula 57 Mars Reconnaissance Orbiter 57 adaptive optics 57 JWST 57 gamma rays 57 Chandra X ray 57 Astronomers 57 ringed planet 57 THEMIS 57 Saturn rings 57 Astrophysics 56 interstellar dust 56 Milky Way Galaxy 56 spectrograph 56 telescopes 56 MESSENGER 56 dwarf galaxies 56 supernova 56 ESO 56 Astrophysical Journal 56 brown dwarf 56 planet orbiting 55 SDSS 55 spatial resolution 55 Envisat 55 spectrometer 55 Hubble 55 Enceladus 55 cosmic ray 55 Kepler 55 spiral galaxy 54 cometary 54 spectroscopy 54 supernovas 54 flyby 54 HiRISE 54 galaxy 54 spiral galaxies 54 infrared 54 Milky Way galaxy 54 Hubble telescope 54 comet 54 Saturn moon 54 Betelgeuse 54 aurora 53 sunspot 53 infrared radiation 53 planets 53 supermassive black hole 53 Milky Way 53 STEREO