Related by context. Frequent words. (Click for all words.) 63 Palomar Observatory 60 observatory 54 Lowell Observatory 54 WM Keck Observatory 54 telescope 54 telescopes 54 observatories 53 optical telescopes 53 Observatories 52 Very Large Array 52 optical telescope 52 HiRISE 52 Planetary Laboratory 51 NRAO 51 Mauna Kea 50 Observatory 50 THEMIS 49 ESO Very Large Telescope 49 infrared telescope 49 Mars Reconnaissance Orbiter 49 XMM Newton 49 Haleakala 49 Canyon de Chelly 49 NASA JPL 49 planetary scientist 49 Thirty Meter Telescope 48 JWST 48 Superstition Mountains 48 orbiting telescope 48 JPL 48 Mount Lemmon 48 Telescope 48 astronomy 48 Gemini Observatory 48 Griffith Observatory 47 infrared wavelengths 47 LSST 47 astronomical observatory 47 Jet Propulsion Laboratory 47 Space Telescope 47 Flagstaff 47 NASA Jet Propulsion Laboratory 47 LIGO 47 orbiting spacecraft 47 NASA Goddard 47 astronomers 47 NASA Mars Reconnaissance 46 Jet Propulsion Laboratory JPL 46 rock outcrop 46 hyperspectral 46 Astronomy 46 thermal emission spectrometer 46 Resolution Imaging 46 credit NASA JPL 45 adaptive optics 45 New Horizons spacecraft 45 LASP 45 Carrizo Plain 45 CALIPSO 45 CU Boulder 45 NASA Chandra 45 occultation 45 Sangre de Cristo Mountains 45 Hubble Telescope 45 NASA Cassini spacecraft 45 mesa 45 unaided eye 45 aurora 44 butte 44 Cassini Huygens 44 Tohono O'odham Nation 44 Very Large Telescope 44 Mars Odyssey 44 Kilauea volcano 44 Sandia 44 extrasolar planets 44 astronomical observations 44 Andromeda galaxy 44 planetarium 44 interferometer 44 moon Charon 44 Opportunity rover 44 CMEs 43 dust devils 43 auroral 43 astronomer 43 NASA Ames 43 infrared 43 NASA 43 Arecibo 43 Cassini spacecraft 43 COROT 43 Mesa Verde 43 LANL 43 Radio Astronomy Observatory 43 Spectrometer 43 unmanned spacecraft 43 Hinode 43 Papago Park 43 Milky Way Galaxy 43 Palomar Mountain