Related by context. Frequent words. (Click for all words.) 62 WM Keck Observatory 56 infrared telescope 55 telescopes 55 Gemini Observatory 54 ESO Very Large Telescope 54 optical telescopes 53 CALIPSO 52 Arecibo Observatory 51 observatories 51 Very Large Telescope 51 seismometers 51 optical telescope 51 Hinode 50 spectroscopic 50 telescope 49 comet nucleus 49 interferometry 48 interferometer 48 adaptive optics 48 Telescopes 48 MODIS 48 Very Large Array 48 optical microscopy 48 distant galaxy 48 seismographs 48 transmission electron microscope 47 astronomers 47 CloudSat 47 Milky Way Galaxy 47 New Horizons spacecraft 47 spectrometer 47 seismometer 47 NASA Lunar Reconnaissance 47 microlensing 47 astronomical observations 47 Kitt Peak 47 XMM Newton 46 X ray telescope 46 scanning electron microscope 46 hyperspectral 46 orbiting satellites 46 LIGO 46 COROT 46 NASA Cassini spacecraft 46 gravitational wave 46 Deep Impact spacecraft 45 orbiting observatory 45 distant galaxies 45 moonrise 45 moon Charon 45 gamma ray burst 45 optical microscope 45 supernova remnant 45 Cassini orbiter 45 Moderate Resolution 45 orbiting telescope 45 occultation 45 NASA Chandra 45 cosmic microwave background 45 infrared 45 redshift 44 multispectral 44 infrared wavelengths 44 Andromeda galaxy 44 orbiting spacecraft 44 MARSIS 44 infrared spectrometer 44 Orion Nebula 44 IceCube 44 astronomical objects 44 Lick Observatory 44 X ray emission 44 THEMIS 44 gravitational lensing 44 observatory 44 Telescope 44 NASA Kepler 44 Observatories 44 galaxy cluster 44 spectrometers 43 tide gauges 43 Envisat 43 Crab Nebula 43 NASA Aqua 43 Cassini Huygens 43 orbiting Mars 43 spacecrafts 43 Titan Saturn 43 Jet Propulsion Laboratory JPL 43 celestial object 43 Global Surveyor 43 Thirty Meter Telescope 43 reconnaissance satellites 43 satellites orbiting 43 astronomical observatory 43 geostationary satellites 43 Palomar Observatory 43 imager 43 geophysicists 43 Mars orbiter 43 GPS satellites