Related by context. Frequent words. (Click for all words.) 62 Galaxy Evolution 62 Adaptive Optics 61 NASA Cassini 61 interplanetary spacecraft 60 Keck telescope 60 Spectrometer 60 Lunar Reconnaissance Orbiter LRO 60 NASAs 60 NASA Stardust spacecraft 60 NASA Kepler 60 astronomical telescope 60 infrared telescope 59 Galileo spacecraft 59 VIRTIS 59 Mauna Kea Hawaii 59 COROT 59 credit NASA JPL 59 SIRTF 59 Lunar Prospector 58 ESO Very Large Telescope 58 Arecibo Observatory 58 orbiting Hubble Space Telescope 58 X ray telescope 58 XMM Newton 58 Keck Observatory 58 orbiting telescope 58 Mini SAR 58 STScI 58 JPL manages 58 CALIPSO 58 Kepler spacecraft 57 NASA ESA Hubble 57 NASA Cassini spacecraft 57 National Astronomical Observatory 57 Very Large Array 57 Cassini Huygens 57 LOFAR 57 optical telescopes 57 radial velocity 57 spacecraft orbiting 57 particle detectors 57 spectrographs 56 Spitzer Space Telescope 56 Johns Hopkins Applied Physics 56 HiRISE camera 56 Space Telescope 56 Planetary Physics 56 extrasolar planet 56 particle detector 56 Credit NASA JPL 56 astronomers 56 MARSIS 56 X ray Observatory 56 Carnegie Observatories 56 NASA Lunar Reconnaissance 56 NASA Chandra 56 interferometric 56 Astrophysicist 56 Tropical Rainfall Measuring 56 NASA Goddard 56 Observatories 55 VLBI 55 NASA Spacecraft 55 Viking landers 55 Southern Observatory ESO 55 Hubble Telescope 55 photometer 55 telescope 55 Thermal Emission Imaging 55 Hubble observations 55 Gravity Recovery 55 Steward Observatory 55 astronomical observations 55 spectroscopic 55 CoRoT 54 noctilucent clouds 54 Meteorological Satellite 54 SMOS 54 WFC3 54 astrophysicists 54 Remote sensing 54 TrES 54 geochemists 54 WM Keck Observatory 54 interferometer 54 HD #b [002] 54 System THEMIS 54 WASP #b 54 Applied Physics Laboratory 54 CRISM 54 orbiting Saturn 54 Garching Germany 53 radiometer 53 Chandra X ray 53 NASA JPL Caltech 53 PASADENA Calif. NASA 53 interferometers 53 Gravity Probe B 53 LIGO 53 STEREO 53 adaptive optics