Related by context. Frequent words. (Click for all words.) 59 telescope 58 astronomical observatory 58 ESO Very Large Telescope 57 Very Large Telescope 56 telescopes 54 observatory 53 Keck Observatory 52 optical telescope 52 infrared telescope 52 Observatories 49 interplanetary spacecraft 49 WM Keck Observatory 49 Very Large Array 49 Gemini Observatory 48 Astronomy 48 microlensing 48 observatories 48 COROT 47 astronomy 47 Arecibo Observatory 47 Palomar Observatory 47 Observatory 46 National Optical Astronomy 46 astronomers 46 VLBA 46 X ray telescope 46 CubeSat 45 CloudSat 45 Telescope 44 OGLE 44 scanning electron microscope 44 Solar Dynamics 44 moon Charon 44 optical telescopes 44 adaptive optics 44 CALIPSO 44 field Infrared Survey 44 hyperspectral 44 Galaxy Evolution 44 ASTER 43 ringed planet 43 Andromeda galaxy 43 IceCube 43 ESRF 43 SMOS 43 microscopic imager 43 scanning tunneling microscope 43 interferometry 43 Fresnel lens 43 astronomical observations 43 orbiting telescope 43 celestial object 43 NASA Chandra 43 Space Agency 43 spacecraft orbiting 42 panoramic camera 42 Solar System 42 Kitt Peak 42 geodetic 42 planetarium 42 transmission electron microscope 42 Thirty Meter Telescope 42 Pan STARRS 42 Spitzer Space Telescope 42 thermal emission spectrometer 42 Spectrometer 42 Cassini Huygens 42 LIGO 42 unmanned spacecraft 42 gravitational wave 42 interferometer 42 extrasolar planet 42 Lick Observatory 42 Astrophysics 42 AMSAT 42 eyepiece 42 HARPS 41 NASA Cassini 41 THEMIS 41 ESOC 41 orbiting 41 Telescopes 41 camera obscura 41 aurora 41 Hubble Telescope 41 XMM Newton 41 constellations 41 NASA JPL Caltech 41 SPIRE 41 LCLS 41 orbiting Mars 41 Credit NASA JPL 41 Hubble telescope 41 X ray Observatory 41 extrasolar planets 41 volcanically active 41 seismology 41 Andromeda Galaxy 41 Geophysical Institute 41 Resolution Imaging 41 radiometer