Related by context. Frequent words. (Click for all words.) 70 spy satellites 64 satellites 56 satellites orbiting 54 remote sensing satellites 54 spacecraft 53 orbiting satellites 52 synthetic aperture radar 52 unmanned aircraft 52 reconnaissance aircraft 52 reconnaissance planes 51 satellite imagery 51 orbiters 50 robotic spacecraft 50 lunar orbiter 50 remotely piloted 50 orbiting spacecraft 49 intercontinental missiles 49 unmanned drone 49 infrared detectors 49 UAVs 49 satellite 49 multispectral 49 orbiter 48 spacecrafts 48 unmanned 48 drones 48 Aegis radar 48 satellite constellation 48 unmanned aerial vehicle 48 remote sensing satellite 47 GPS satellites 47 spy drones 47 geostationary satellites 47 Cassini orbiter 47 radars 47 sonars 47 UAV 47 hyperspectral 47 Cassini Huygens 47 ASTER 47 intercontinental missile 47 drone aircraft 46 Radarsat 2 46 GeoEye 46 SIGINT 46 unmanned aerial 46 unmanned aerial vehicles 46 NASA Cassini spacecraft 46 microsatellites 46 Lunar Reconnaissance Orbiter 46 Global Hawk 46 Unmanned Aerial Vehicle 46 aerial reconnaissance 46 TRMM 46 unmanned spacecraft 45 JAXA 45 stealth fighters 45 X #B 45 infrared telescope 45 Missile Defense Agency 45 optical telescopes 45 astronomical observations 45 aerial drones 45 unmanned drones 45 infrared 45 interceptor missile 45 observatories 45 Envisat 44 orbiting observatory 44 hyperspectral imaging 44 Imagery 44 Landsat 44 pilotless planes 44 Musudan ri 44 remotely piloted aircraft 44 XMM Newton 44 precision munitions 44 reconnaissance 44 NASA Mars Odyssey 44 drone 44 Geostationary Operational Environmental 44 reconnaissance missions 44 Aegis equipped 44 polar orbit 44 Agency JAXA 44 Global Surveyor 44 surveillance drones 44 flybys 44 aerial surveillance 44 ScanEagle 44 IceCube 43 pilotless drones 43 radar evading 43 stealth fighter jet 43 meteoroids 43 WorldView 43 Orbiter 43 CloudSat 43 TacSat 43 orbiting telescope 43 booster rockets