Related by context. Frequent words. (Click for all words.) 51 photometry 51 radiometer 48 eyepieces 48 WFC3 48 TerraSAR X 48 irradiance 47 collimator 47 photometer 47 WFPC2 47 orbital 46 interplanetary spacecraft 46 SMOS 46 ultraviolet wavelengths 46 sunshield 46 VIRTIS 46 photoluminescence 45 telescope 45 MetOp 45 infrared imagery 45 orbiting observatory 45 Live MOS sensor 45 COROT 45 lenses 45 imager 44 Sensing Satellite LCROSS 44 HRSC 44 panoramic camera 44 orbiting telescope 44 innermost planet 44 CALIPSO 44 visible wavelengths 44 photometric 44 Hinode 44 spacecraft 44 optical wavelengths 44 LROC 44 adaptive optics 44 STEREO 44 eyepiece 44 SIRTF 44 optical microscope 44 microscopic imager 44 interferometric 44 multispectral 43 Webb Telescope 43 CCD camera 43 spacecraft orbiting 43 magnifications 43 New Horizons spacecraft 43 clerestory windows 43 KA SAT 43 prisms 43 interferometry 43 circular orbit 43 shorter wavelengths 43 Imaging Spectroradiometer MODIS 43 coronal 42 HiRISE camera 42 lunar orbit 42 viewfinders 42 JWST 42 solar corona 42 infrared IR 42 geostationary transfer 42 ultraviolet 42 photocell 42 Minotaur IV 42 Lunar Reconnaissance Orbiter 42 photovoltaic arrays 42 geostationary orbit 42 illumination 42 telescopes 42 ion propulsion 42 pulsed laser 42 electron spins 42 Resourcesat 2 42 moon Charon 42 Ares IX rocket 42 orbiters 42 synthetic aperture radar 41 JCSAT 41 NICMOS 41 aperture 41 infrared 41 polar orbit 41 heliostats 41 curvature 41 remote sensing satellites 41 satellites 41 magnification 41 wavefront 41 interferometers 41 interferometer 41 solar arrays 41 parallax barrier 41 NASA ESA Hubble 41 camera viewfinder 41 Jupiter Saturn 40 comet nucleus 40 confocal 40 downlight