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(Click for frequent words.) 71 satellites 67 GPS satellites 65 satellites orbiting 64 Earth orbiting satellites 62 geosynchronous satellites 60 geostationary satellites 60 satellites orbiting Earth 59 earth orbiting satellites 59 spacecraft 59 geostationary orbits 56 geosynchronous 56 satellite 56 Iridium satellites 55 orbiting 55 Galileo satellites 55 LEO satellites 55 geostationary satellite 55 interplanetary spacecraft 55 orbiting telescope 55 Earth orbit 54 Nasa spacecraft 54 orbiters 54 orbiting Hubble Space Telescope 54 infrared telescopes 54 NFIRE satellite 53 orbiting spacecraft 53 orbit GEO 53 spy satellites 53 polar orbiting satellites 53 orbiting telescopes 53 geostationary 53 reconnaissance satellites 53 micrometeoroids 53 robotic probes 53 Skynet 5C 53 satellite constellation 53 geosynchronous satellite 52 mock warhead 52 Galileo constellation 52 Helios 2B 52 Mars Odyssey spacecraft 52 incoming ballistic missiles 52 spacecrafts 52 NROL 52 geosynchronous orbits 52 THEMIS satellites 52 observatories 52 intercontinental ballistic missiles 52 polar orbiting 52 geostationary communications 52 Chang'eI 52 GOES satellites 52 Minotaur rocket 51 Martian rovers 51 Globalstar constellation 51 geo stationary satellites 51 Meteorological Satellite 51 meteorological satellites 51 FORMOSAT 51 Global Positioning Satellites 51 Milstar II 51 ballistic missiles cruise missiles 51 detect gravitational waves 51 Ulysses spacecraft 51 Michibiki 51 optical telescopes 51 QuikSCAT 51 Earth orbit LEO 51 spaceborne 50 robotic spacecraft 50 satelites 50 telescopes 50 Program DMSP 50 Surveillance System STSS 50 ion propulsion 50 Comet Hartley 50 unmanned spacecraft 50 ROCSAT 2 50 orbit 50 MTSAT 1R 50 highly elliptical orbits 50 asteroids 50 Cryosat 50 NFIRE 50 ballistic trajectory 50 Insat 4B 50 ALMA antennas 50 robotic rovers 50 X ray observatories 50 KazSat 50 orbiting observatories 50 highly elliptical orbit 50 spacecraft orbiting 50 flyby spacecraft 50 planetary Transits 49 meteoroids 49 INSAT 4B 49 Aegis destroyers 49 Laura Grego 49 Hubble Space Telescope HST 49 GLONASS satellites 49 spaceplane 49 geo stationary satellite 49 NASA Landsat 49 TDRS K 49 STEREO spacecraft 49 Navstar GPS 49 geo synchronous orbit 49 geo stationary orbit 49 Epsilon Eridani 49 orbiting observatory 49 antisatellite weapon 49 GOSAT 49 GSAT 5P 49 orbits 49 hypersonic speeds 49 Glonass satellites 49 CHIPSat 49 Herschel Planck 49 telescope 49 Stardust spacecraft 49 orbiter Mars Odyssey 49 STSS satellites 49 IBEX spacecraft 49 solar flares 49 unmanned probes 49 DigitalGlobe WorldView 49 Spaceguard Survey 49 SBSS Block 49 Glonass M 49 NASA EPOXI mission 49 NAVSTAR Global Positioning System 49 Deep Impact comet 49 frequency VLF 49 impactors 49 Meteorology Ionosphere 49 EKV 49 QuikScat 48 TanDEM X 48 NAVSTAR GPS 48 Observatory SDO 48 NASA Kepler telescope 48 orbital 48 orbiter 48 THEL 48 Global Surveyor 48 remote sensing satellites 48 deorbiting 48 meteoroid 48 interceptor missile 48 Milstar 48 GOCE 48 Mars orbiters 48 TDRSS 48 positioning satellites 48 Stratellite 48 geostationary orbit 48 geo synchronous 48 Constellation Observing 48 O OREOS 48 Climate Experiment GRACE 48 atmospheric disturbances 48 DSCS III 48 Envisat satellites 48 aboard ESA Envisat 48 Hubble gyroscopes 48 SMOS mission 48 interferometers 48 Keck telescope 48 New Horizons spacecraft 48 X ray telescopes 48 Ariane rocket 48 Giove B 48 Gorgon Stare 48 Kurs automated 48 AERONET 48 Oceansat 2 48 ionosphere 48 tiny meteoroids 48 gamma ray detectors 48 LAGEOS 48 entire Milstar constellation 48 radiosondes 48 MUOS satellite 48 Landsat satellites 48 GIOVE B 48 Comet Churyumov Gerasimenko 48 CALIPSO satellites 48 Hubble Space Telescope 48 orbital velocity 48 Sinosat 48 INSAT 4CR 48 Deep Impact probe 48 interstellar particles 48 TerraSAR X 48 NOAA GOES 48 Interior Laboratory GRAIL 48 Mars landers 48 NEOSSat 48 intercontinental missiles 48 Infrared Pathfinder Satellite 48 WGS satellites 48 NASA THEMIS 48 Yahsat 1A 48 optical wavelengths 47 Geo IK 47 Shenzhou capsule 47 Beidou satellite 47 Messenger spacecraft 47 C NOFS 47 LORRI 47 laser altimeter 47 RazakSAT 47 WISE spacecraft 47 Comet Hartley 2 47 lunar orbiter 47 interceptor 47 hypervelocity 47 Planck satellite 47 microsatellites 47 ESA Planck 47 NuSTAR 47 Mars orbiter 47 Fengyun 1C 47 Earth orbiting spacecraft 47 XTAR EUR 47 transiting planets 47 Eutelsat KA SAT 47 Uninhabited Aerial Vehicle 47 Milstar satellites 47 lunar orbiter Chang'e 47 Mars rovers 47 exoplanetary 47 WISE infrared 47 Arecibo Observatory 47 Wideband Global 47 NASA Stardust spacecraft 47 Earth Observation satellites 47 GPS IIF satellites 47 Lunar Reconnaissance Orbiter LRO 47 Kwajalein Island 47 Synthetic Aperture Radar 47 microshutters 47 EPOXI mission 47 orbital rendezvous 47 electromagnetic signals 47 NASA STEREO 47 Airborne Laser 47 radars telemetry 47 polar orbit 47 downlinks 47 MUOS satellites 47 Hubble telescope 47 hydrogen maser 47 Keck telescopes 47 JCSAT 9 47 EELVs 47 MN4 47 GOES O 47 infrared astronomy 47 Orbiter MRO 47 Voyager probes 47 orbiting Mars 47 unmanned spaceplane 47 THEMIS spacecraft 47 interplanetary probes 47 scatterometer 47 SIM PlanetQuest 46 Anik F3 46 Earth Orbit LEO 46 exoatmospheric kill vehicle 46 antennas 46 LRO spacecraft 46 thruster firings 46 Planck telescope 46 observatory 46 Space Launch Vehicle 46 Proba 2 46 Anisotropy Probe WMAP 46 THAAD interceptor 46 Fomalhaut b 46 meter Keck telescope 46 intercontinental ballistic missiles ICBMs 46 STSS Demo 46 periodic dimming 46 dropsonde 46 Ariane launcher 46 inhabitable planets 46 Hubble Space telescope 46 Telesat Nimiq 46 remote sensing satellite Resourcesat 46 Solar flares 46 cosmic microwave radiation 46 QuikScat failed 46 DART spacecraft 46 Vinasat 46 telescope atop Mauna 46 Solar TErrestrial RElations Observatory 46 Ballistic missiles 46 ICBM 46 Metop 46 e MERLIN 46 ICBMs 46 exoplanets planets 46 Mars Surveyor 46 Ares IX rocket 46 THAAD radar 46 Rosetta comet chaser 46 cosmic rays 46 crewed spacecraft 46 Skynet 5B 46 SBIRS 46 GOCE satellite 46 SBSS satellite 46 INSAT 3E 46 TECSAR 46 brilliant auroras 46 SOHO spacecraft 46 infrared telescope 46 ballistic missiles 46 Antenna LISA 46 SMOS 46 SuitSat 46 observing satellites 46 ESA Envisat satellite 46 warhead 46 asteroid 46 geosynchronous orbit 46 polar orbits 46 Hipparcos 46 Cosmic rays 46 laser designators 46 Mars Reconnaissance Orbiter MRO 46 Galileo spacecraft 46 retroreflector 46 CitySense 46 Yaogan 46 electric ion propulsion 46 Resourcesat 46 scramjet engines 46 ENVISAT 46 RapidEye constellation 46 Herschel telescope 46 probe Chang'e 46 spaceward 46 National Polar Orbiting 46 JCSAT 46 SIRTF 46 EPOXI spacecraft 46 Meteosat 46 outermost planets 46 nanosatellites 46 SMOS Soil Moisture 46 airborne observatory 46 NASA Lunar Crater 46 geosynchronous communications 46 Global Positioning System 46 cosmic ray particles 46 precise atomic clocks 46 lunar probe Chang'e 46 Mobile User Objective 46 MTSAT 46 rocket thrusters 46 RISAT 46 dummy warheads 46 KOMPSAT 46 binary asteroid 46 Yarkovsky effect 45 payloads 45 comets orbiting 45 LCROSS spacecraft 45 Russian Orlan spacesuit 45 Orbiter LRO 45 narrowband tactical 45 AEHF 45 Foton spacecraft 45 L5 signal 45 submillimeter wavelengths 45 Jodrell Bank 45 CARTOSAT 45 infrared ultraviolet 45 geostationary earth 45 CBERS 2B 45 manned spaceships 45 Cassini Huygens 45 Toutatis 45 TerraSAR X satellite 45 Shuttle Discovery blasts 45 orbiter robotic arm 45 cosmic cannibal 45 Dnepr rocket 45 STSS Demonstration 45 Lunar CRater Observation 45 GLONASS 45 atomic clocks 45 rovers Spirit 45 Koreasat 45 GPS constellation 45 Hubble 45 SpaceX Falcon 45 interferometric synthetic aperture radar 45 COSMO SkyMed 45 gamma ray observatory 45 ion thrusters 45 hypersonic glider 45 X #As 45 ProtoStar II 45 Voyager spacecraft 45 DSCS satellites 45 shuttle thrusters 45 Apophis 45 ARISSat 45 manned Shenzhou 45 Resourcesat 2 45 POES satellites 45 Terrestrial Planet Finder 45 Meteosat satellites 45 CALIPSO 45 Earthlike planet 45 UAVs 45 Mars Color Imager 45 irregularly shaped asteroid 45 NASA rovers 45 Mars Odyssey 45 infrared spectrometers 45 CoRoT satellite 45 Pan STARRS 45 GOES N 45 WGS satellite 45 gaseous planet 45 GALEX 45 terrestrial transmitters 45 Block IIF 45 elliptical orbit 45 Jovian moons 45 robotic telescopes 45 BepiColombo 45 Palapa D 45 twin STEREO spacecraft 45 JWST 45 Molczan 45 mooncraft 45 meter Keck telescopes 45 Satellite Aided Tracking 45 reconnaissance orbiter 45 planets orbits 45 Briz M booster 45 GSLV D3 rocket 45 alien civilizations 45 Mission TRMM satellite 45 GPS IIR M 45 Eagle lunar lander 45 intercept ballistic missiles 45 Ocean Salinity 45 PSLV C# rocket 45 geosynchronous GEO 45 Chandrayaan 45 PSLV rocket 45 GLAST spacecraft 45 ray Space Telescope 45 Tanegashima Space Center 45 Burst Alert 45 hypersonic scramjet 45 Glonass K 45 diazepam pharmacy 45 Mars Odyssey orbiter 45 ionospheric 45 Shenzhou spacecraft 45 Phoenix Mars lander 45 Rosetta orbiter 45 Glonass navigation 45 GOES R 45 Anik F1 45 INSAT 3A 45 Rosetta spacecraft 45 electromagnetic pulses 45 NASA GeneSat 1 45 asteroid Itokawa 45 Insat 4A 45 stage Naro rocket 45 Transformational Satellite Communications 45 maneuvering thrusters 45 Martian dust 45 Reconnaissance Orbiter 45 HAMSAT 45 Odyssey orbiter 45 LOFAR 45 Foton M2 45 Mars Pathfinder lander 45 Kazakhstan Baikonur Cosmodrome 45 Express AM# 45 NASA Gamma ray 45 NEAs 45 NAVSTAR 45 telemetry 45 FASTSAT 45 exo atmospheric 45 Cartosat 2A 45 radial velocity 45 datalinks 45 EPLRS 45 ocean buoys 45 Solar Terrestrial Relations 45 Aegis radar 45 interferometer 45 Tunguska asteroid 45 Orbiting Carbon Observatory 45 Convection Rotation 45 Orion spacecraft 45 elliptical orbits 45 pad #A 45 orbiting remnant 45 manned spacecraft 45 Sensing Satellite LCROSS 45 comets asteroids 44 radars 44 radiometers 44 geosynchronous Earth 44 preset orbit 44 geomagnetic storms 44 WMAP satellite 44 jovian 44 Cosmic ray 44 Global Differential GPS 44 Iridium satellite 44 Cassini Huygens spacecraft 44 INSAT 3D 44 INSAT satellite 44 Pan STARRS telescope 44 ion propulsion engines 44 deorbited 44 exoplanet hunter 44 starboard SARJ 44 Galaxy 4R 44 Cloud Aerosol Lidar 44 fainter objects 44 Air Force TacSat 44 Arecibo telescope 44 CBERS 44 RADARSAT 2 44 infra red sensors 44 X ray telescope 44 robotic explorer 44 twin Voyager spacecraft 44 Ranging spacecraft 44 sondes 44 Milstar satellite 44 SpaceX Dragon capsule 44 International Space Station 44 Omid Hope 44 ExoMars rover 44 System MUOS 44 Earth Observation EO 44 SES WORLD SKIES NSS 44 particle beam 44 planetary missions 44 heavier payloads 44 lunar probes 44 Doppler radars 44 Hispasat 1E 44 Earth asteroids 44 midcourse phase 44 radio occultation 44 lunar orbits 44 Klinkrad 44 homing beacons 44 TecSAR 44 Viking landers 44 Lunokhod 44 lunar landers 44 Solaren 44 Wallops Island Va. 44 GPS IIF 44 QuikSCAT satellite 44 AEHF satellite 44 Webb Telescope 44 unmanned 44 Earth radii 44 Tropical Rainfall Measuring 44 NASA ICESat 44 Mars Opportunity rover 44 reconnaissance drones 44 cosmic ray 44 Satellite GOSAT 44 aimpoint 44 colliding asteroids 44 unmanned reconnaissance aircraft 44 WFPC2 44 SpaceLoft XL rocket 44 EP 3E 44 MAVs 44 Churyumov Gerasimenko 44 NIRSpec 44 TacSat 44 Submillimeter Array 44 gravitational slingshot 44 VINASAT 1 44 Werthimer 44 ESA XMM Newton 44 WFC3 44 rovers 44 APXS 44 Mars Orbiter 44 planetary spacecraft 44 aperture telescope 44 asteroid Steins 44 Keck Telescopes 44 Cartosat 2B 44 geo synchronous transfer 44 Planck spacecraft 44 MetOp satellite 44 ICESat 44 ESO VLT 44 SCISAT 44 hypersonic missiles 44 ESA ERS 44 orbiting gamma ray 44 MEXSAT 44 A# spacecraft 44 ESA Envisat 44 SpaceWeather.com 44 Upsilon Andromedae b 44 EPOXI 44 Minuteman IIIs 44 experimental payloads 44 kinetic warhead 44 GSLV rockets 44 Climate Experiment SORCE 44 UHF frequencies 44 Earth objects NEOs 44 NASA MESSENGER spacecraft 44 Ikonos 44 electro optic sensors 44 asteroids orbiting 44 Kuiper belt object 44 antiballistic missile 44 Epoxi 44 Geminga 44 orbital insertion 44 IKONOS 44 gyroscopes 44 Laura Schlessinger shifts 44 polarimetry 44 Beta Pictoris b 44 ESA SMART 44 Telescope Array 44 optical telescope 44 frequency electromagnetic waves 44 SinoSat 44 Suzaku X ray 44 COROT 44 GRACE satellites 44 Glonass navigation satellites 44 Kepler spacecraft 44 NASAs 44 Satellites GOES 44 KSLV 1 44 NPOESS 44 JTRS radios 44 TDRS satellites 44 Kounotori2 44 Proba 44 HiRISE camera 44 Wideband Gapfiller 44 Missile Defense Agency 44 parabolic antennas 44 orbited 44 SeaWiFS 44 proton particles 44 radar altimeter 44 GLAST telescope 44 Chandrayan 44 Aqua satellite 44 Ofeq 44 Landsat satellite 44 SPACEWAY 3 44 photons 44 PAVE PAWS 44 gradiometer 44 GLONASS constellation 44 Synthetic Aperture Radar SAR 44 Orbital Debris 44 LADEE 44 magnetic spectrometer 44 Ku Band 44 antisatellite 44 Aerojet propulsion 44 planetary surfaces 44 equatorial orbit 44 Huygens descent 43 ELTs 43 Advanced Microwave Scanning 43 Glonass 43 radiosonde 43 Fermilab Tevatron 43 Telescope BAT 43 lunar explorer 43 WISE mapped 43 SkyRouter 43 Geostationary 43 mechanically scanned 43 stealth cruise missiles 43 Deep Impact flyby spacecraft 43 robotic lander 43 Spitzer infrared 43 infrared observatory 43 Dragon capsule 43 CloudSat 43 synthetic aperture radar 43 interferograms 43 Turksat 3A 43 Keck Telescope 43 Minotaur IV rocket 43 Impact Probe MIP 43 Apophis asteroid 43 SPACEWAY TM 43 Chang'e 43 Express orbiter 43 NASA Kepler 43 NigeriaSat 43 synchronous orbit 43 GEO satellites 43 Field Infrared Experiment 43 satellite Omid Hope 43 cruise missiles 43 Geosynchronous 43 Ares rocket 43 Insat 4CR 43 railgun 43 entangled photons 43 dipole antennas 43 nexgen 43 Shenzhou spaceships 43 Sojourner rover 43 Mars moon Phobos 43 LRO 43 DMSP satellites 43 C4I systems 43 Aegis cruisers 43 QZSS 43 PSLV C6 43 ICBMS 43 Koreasat 6 43 INSAT 4A 43 NASA rovers Spirit 43 troposcatter communications 43 SES Americom AMC 43 UAVSAR 43 Simorgh rocket 43 Higgs bosons 43 Globalstar satellites 43 unpiloted aircraft 43 Kwajalein Atoll 43 Ted Molczan Canadian 43 GPS 2R 43 HIRES spectrometer 43 interceptor rockets 43 HIAPER 43 geo stationary 43 planetary orbits 43 uncrewed 43 Apstar 43 INSAT satellites 43 comet Boethin 43 NASA Far Ultraviolet 43 Spaceguard 43 NASA Kepler spacecraft 43 Remote sensing 43 warheads 43 SumbandilaSat 43 DubaiSat 1 43 Intelsat satellites 43 ISS crewmembers 43 lidar instrument 43 satellite altimeters 43 MESSENGER spacecraft 43 NASA CloudSat 43 X ray observatory 43 panchromatic camera 43 EPOCh 43 radar altimetry 43 planet magnetosphere 43 gravitational keyhole 43 gamma ray flashes 43 Jodrell Bank Observatory 43 Eurostar E# platform 43 Saturnian moon Titan 43 Shuttle undocks 43 polarimetric 43 astrometry 43 ARGUS IS 43 Solar Dynamics Observatory 43 ST5 43 telemetry tracking 43 Tomahawk cruise missile 43 guided munition 43 unmanned airships 43 orbiter Cassini 43 intercontinental missile 43 particle detector 43 RXTE 43 Inertial Navigation System 43 ROSAT 43 manned spaceship 43 astronomical observatories 43 LFA sonar 43 pilotless plane 43 Iridium Satellite LLC 43 Hubble orbits 43 Advanced Extremely 43 binary asteroids 43 celestial phenomena 43 GLONASS navigation 43 E 8C 43 Earth Observing 43 Orbiter 43 Wide Area Augmentation 43 Titan 4B 43 Crawler Transporter 43 extraterrestrial civilizations 43 Orbiting 43 electro optical sensor 43 DMSP F# 43 move COTM 43 durable twin rovers 43 ballistic missile 43 Global Hawk 43 Advanced EHF satellite 43 robotic explorers 43 Ka band 43 space module Tiangong 43 satellite IKONOS 43 RADARSAT 43 AESA radar 43 Predator UAV 43 Earth orbiting LEO 43 conventional warhead 43 Gemini telescopes 43 laser altimetry 43 VINASAT 43 Sun synchronous orbit 43 moon Io 43 X #B 43 neutrino detectors 43 Martian orbit 43 laser designator 43 electromagnetic waves 43 atmospheric turbulence 43 deorbit 43 Formosat 2 43 Shuttle Endeavour docks 43 Highly Adaptable Satellite 43 Telstar #R 43 moons orbiting Saturn 43 Reconnaissance Office 43 Cassini orbiter 43 Anik F2 43 Rockot launcher 43 extraterrestrial UFOs 43 six wheeled rover 43 Reflection Radiometer 43 radar altimeters 43 GPS IIIA 43 radar interferometry 43 F/A-# fighters 43 DF #D 43 Libra constellation Vogt 43 Comet #P/Churyumov-Gerasimenko 43 Yinghuo 1 43 THAAD missile 43 A#T 43 galactic cosmic rays 43 elongated orbits 43 coronagraph 43 infra red imaging 43 orbit spares 43 H2A rocket 43 NASA 43 carry heavier payloads 43 fueled multistage rocket 43 Orbiting Carbon Observatory OCO 43 spacecraft Hayabusa 42 Curiosity rover 42 # Apophis 42 energetic electrons 42 entangled photon 42 Arabsat 5A 42 Particle accelerators 42 antisatellite missile 42 Greenhouse Gases Observing 42 interceptor missiles 42 deformable mirror 42 NASA Cassini 42 Comet Halley 42 SSMEs 42 Mars orbiting spacecraft 42 Beidou 42 CryoSat satellite 42 cosmic radiation 42 micrometeorite 42 asteroid Apophis 42 moonlets 42 MErcury Surface Space ENvironment 42 Ranging MESSENGER spacecraft 42 MUOS 42 wavelength infrared 42 STPSat 42 Helix Nebula 42 accurate atomic clocks 42 Astra 3B 42 Comet Boethin 42 Titan flyby 42 Relations Observatory STEREO 42 millimeter wavelength 42 Blackswift 42 spacecraft Cassini 42 entered lunar orbit 42 electromagnetic pulse 42 Shenzhou capsules 42 Lunar Reconnaissance Orbiter 42 Saturn Cassini 42 terahertz frequencies 42 NCADE 42 HD#b 42 cometary debris 42 German SAR Lupe 42 Total Ozone Mapping 42 System Block IIR 42 NASA Stratospheric Observatory 42 multistage rocket 42 Kosmos 3M rocket 42 telescopic observations 42 Globalstar satellite 42 BSAT 3a 42 Dyna Soar 42 Radarsat 2 42 THAAD interceptors 42 interplanetary missions 42 antiballistic missiles 42 Orbital Express 42 Gravity Probe 42 Satellite GOES 42 hydrazine thrusters 42 Thales Alenia 42 Faulkes Telescope 42 orbital debris 42 Photons 42 colliders 42 SBIRS GEO 42 volcanic plumes 42 Philae lander 42 National Reconnaissance 42 rover Opportunity 42 Explorer WISE 42 aboard SpaceX Falcon 42 inertial guidance 42 Aerospace DAILY 42 smallest exoplanet 42 SPHERES 42 shuttle orbiter 42 Martian rover 42 spectral bands 42 NASA Cassini spacecraft 42 Crewmate Tracy Caldwell 42 Boeing #HP 42 millimeter wave MMW 42 interceptors 42 bedrock outcropping 42 TRMM satellite 42 NextSat 42 Soyuz rockets 42 Geosynchronous Transfer Orbit 42 MEASAT 3a 42 AeroAstro 42 lunar perigee 42 HiRISE camera aboard 42 GBIs 42 ICO G1 satellite 42 Tempel Tuttle 42 Cancri e 42 spacecraft Chandrayaan 1 42 Ultraviolet Imaging Spectrograph 42 Predator unmanned aircraft 42 thruster 42 Navstar 42 Lovell Telescope 42 passive sonar 42 astronomical telescopes 42 Polar orbiting Operational 42 MIT planetary scientist 42 GE CF6 engines 42 steerable beams 42 Solar Orbiter 42 Konacki 42 Soyuz spacecraft 42 SSETI Express 42 orbiting ISS 42 INSAT 4C 42 CubeSats