Related by context. Frequent words. (Click for all words.) 79 Very Large Telescope 68 XMM Newton 64 WM Keck Observatory 64 spectroscopic 62 Spitzer Space Telescope 61 adaptive optics 61 interferometer 60 COROT 60 telescopes 60 Spectrometer 59 optical telescopes 59 gravitational lensing 59 NASA Chandra 58 interferometry 58 scanning electron microscope 58 optical telescope 57 LIGO 57 telescope 57 infrared telescope 57 astronomers 56 spectrometer 56 X ray Observatory 56 X ray diffraction 56 Space Telescope 55 ESO 55 distant galaxies 55 Orion Nebula 55 spectra 55 spectrometers 55 redshift 55 NASA Cassini spacecraft 55 infrared spectrometer 55 spectroscopy 55 infrared wavelengths 54 astronomical observations 54 X ray emission 54 MODIS 54 transmission electron microscope 54 quasars 53 multispectral 53 NASA Mars Reconnaissance 53 distant galaxy 53 Cassini spacecraft 53 extrasolar planets 53 photometric 53 NASA Aqua 53 gamma ray 53 supernova remnant 52 IceCube 52 Raman spectroscopy 52 spatial resolution 52 tomography 52 gravitational wave 52 Cassini Huygens 52 occultation 52 spectrograph 52 THEMIS 52 Telescope 51 Observatories 51 Large Magellanic Cloud 51 planet orbiting 51 electron microscope 51 CCD camera 51 WMAP 51 Astronomers 51 extrasolar planet 51 Mars Reconnaissance Orbiter 51 Eta Carinae 51 exoplanet 51 Advanced Camera 50 Chandra X ray 50 Spectroscopy 50 quasar 50 GRBs 50 gamma ray burst 50 panoramic camera 50 HD #b [002] 50 ringed planet 50 HiRISE 50 laser pulses 50 observatories 50 synchrotron 50 Gamma Ray 50 Envisat 50 galaxy cluster 50 astrophysicists 50 astrophysical 50 Hubble Space Telescope 50 unaided eye 50 cosmic microwave background 50 laser scanner 50 infrared 49 optical microscope 49 planets orbiting 49 ASTER 49 celestial objects 49 imager 49 Milky Way Galaxy 49 Fluorescence 49 Astrophysics 49 comet nucleus