Related by context. Frequent words. (Click for all words.) 56 Spectrometer 53 ESO Very Large Telescope 52 MESSENGER 52 XMM Newton 51 STEREO 51 GLAST 51 LIGO 50 interferometry 50 Space Telescope 49 JWST 49 COROT 49 LSST 49 HESS 49 multispectral 49 WISE 48 Hubble Telescope 48 adaptive optics 48 THEMIS 48 spectroscopic 48 IceCube 48 interferometer 48 ESO 48 beamline 47 astrophysical 47 NASA Goddard 47 Solar Dynamics 47 Very Large Telescope 46 ARTEMIS 46 LRO 46 hyperspectral 46 SALT 46 X ray Observatory 45 spectroscopy 45 WM Keck Observatory 45 Hubble Space Telescope 45 Resolution Imaging 45 CloudSat 45 ATLAS 45 NASA Chandra 45 infrared spectrometer 45 Applied Physics Laboratory 45 Planck 44 optical telescopes 44 astronomers 44 NASA JPL 44 INSPIRE 44 Cassini Huygens 44 telescopes 44 WMAP 44 telescope 44 SATURN 44 optical telescope 44 PAMELA 44 spectrometer 44 Spitzer Space Telescope 44 Telescope 43 spectrograph 43 MERLIN 43 LCROSS 43 Hubble telescope 43 HIRES 43 GRACE 43 celestial objects 43 redshift 43 Spectroscopy 43 distant galaxies 43 NASA Kepler 42 Advanced Camera 42 Very Large Array 42 distant galaxy 42 Observatories 42 infrared wavelengths 42 gravitational lensing 42 Gravity Probe B 42 gravitational wave 42 Hubble 42 MARS 42 quasars 42 Chandra X ray 42 GOODS 42 comet nucleus 42 astronomical objects 42 NASA Cassini spacecraft 42 LENS 41 infrared 41 Orion Nebula 41 X ray emission 41 Cassini 41 COMET 41 SWAP 41 gamma ray burst 41 DEVELOP 41 ICESat 41 Mars Reconnaissance Orbiter 41 NASA Hubble Space 41 astrophysicists 41 SPACE 41 GENESIS 40 HiRISE 40 Astrophysics 40 unaided eye