Related by context. Frequent words. (Click for all words.) 62 spectrometer 58 thermal emission spectrometer 57 radiometer 57 microscopic imager 56 panoramic camera 56 spectrometers 54 Spectrometer 53 rock abrasion 53 hyperspectral 53 interferometer 52 spectroscopic 52 radar altimeter 51 synthetic aperture radar 51 MARSIS 51 infrared spectrometer 51 interferometry 51 SMOS 50 STIS 50 CALIPSO 50 radiometric 49 spectrometry 49 transmission electron microscope 49 lunar surface 49 optical microscope 49 magnetometer 49 OSIRIS 48 infrared telescope 48 spectroscopy 48 particle beam 48 photometric 48 optical microscopy 48 scanning electron microscope 48 Voyager spacecraft 48 multispectral 48 ion propulsion 47 VLBA 47 spectra 47 cosmic ray 47 XMM Newton 47 ESO Very Large Telescope 47 orbiting spacecraft 47 isotopic 47 Itokawa 47 Mars Reconnaissance Orbiter 47 ICESat 47 Martian soil 47 telescope 47 lunar soil 46 ionosphere 46 Planck 46 CloudSat 46 Keck Observatory 46 martian 46 airborne magnetic 46 X ray beam 46 mass spectrometer 46 ionisation 46 spatial resolution 45 beamline 45 GOCE 45 Fluorescence 45 infrared spectroscopy 45 thruster 45 Envisat 45 NICMOS 45 infrared 45 spacecraft 45 optical telescope 45 LIGO 45 rock outcrop 45 X ray fluorescence 45 MODIS 45 NASA Aqua 45 CCD camera 45 HiRISE 45 Arecibo Observatory 45 electron beam 45 muon 45 X ray diffraction 45 scanning tunneling microscope 44 Raman spectroscopy 44 diffraction 44 orbiting Mars 44 martian surface 44 regolith 44 X ray beams 44 comet nucleus 44 ionospheric 44 gravitational wave 44 ultrasonic waves 44 satellites orbiting 44 microwave frequencies 44 FT IR 44 Martian surface 44 SQUID 44 magnetosphere 44 FTIR 44 adaptive optics 44 Evolved Gas 44 Orbiter 44 lidar