Related by context. Frequent words. (Click for all words.) 46 cirrus clouds 43 Saturn rings 43 optical telescopes 41 magnetosphere 41 comet nucleus 40 NASA Aqua 40 ejecta 40 oscillations 40 X ray emission 40 iridescence 40 X ray beam 39 interferometer 39 satellites orbiting 39 COROT 39 Earth magnetosphere 39 rays 39 meteoroids 38 muons 38 vortices 38 sunrays 38 infrared wavelengths 38 infrared laser 38 cumulus clouds 38 STEREO 38 laser pulses 38 hydrogen atoms 38 wavelengths 38 QuikScat 37 CloudSat 37 infrared radiation 37 astronomical observations 37 reconnaissance satellites 37 interferometry 37 reflectance 37 tide gauges 37 auroral 37 reflectivity 37 reflective surfaces 37 HD #b [002] 37 TRMM 37 radars 37 infrared 37 ionosphere 37 JWST 36 ionized gas 36 photonic crystals 36 LCROSS 36 NASA Cassini spacecraft 36 lidar 36 unaided eye 36 neutrons 35 blips 35 ORBIMAGE 35 satellite constellation 35 geomagnetic storms 35 oxygen atoms 35 cosmic microwave background 35 infrared rays 35 albedo 35 WMAP 35 prisms 35 satellites 35 fluorescence 35 multispectral 35 synthetic aperture radar 35 electromagnetic waves 35 UVB radiation 35 Geostationary Operational Environmental 35 sunbeam 35 sun rays 35 microsatellites 35 electron beams 35 HiRISE 35 Sunspots 35 Cassini 35 mid latitudes 35 Envisat 35 magnetic fields 34 GOES R 34 positrons 34 nebulae 34 Hubble Telescope 34 laser pulse 34 sunspots 34 geostationary satellites 34 photons 34 Cassini orbiter 34 shimmer 34 aurora 33 geodetic 33 GPS satellites 33 troposphere 33 blobs 33 orbiting satellites 33 constellation Leo 33 laser beams 33 Perseids 33 reconnaissance aircraft 33 starlight 33 sunbeams 33 nuclei