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(Click for frequent words.) 74 MetOp 71 polar orbiting 68 GIOVE B 67 Helios 2B 67 Giove B 66 GOES O 66 GPS IIF 65 SAR Lupe 65 Satellites GOES 65 GPS IIR M 65 Cosmo SkyMed 65 EUMETSAT 65 Eumetsat 65 GPS IIR 64 meteorological satellites 64 NOAA GOES 64 GOES N 64 TanDEM X 64 FORMOSAT 64 MetOp satellite 64 Skynet 5C 64 BepiColombo 64 SMOS 64 INSAT 3D 64 ASTRA 3B 64 GOCE satellite 63 ASTRA 1L 63 Eurostar E# 63 INSAT 3A 63 geosynchronous satellite 63 polar orbiting satellites 63 Cloud Aerosol Lidar 63 geostationary satellite 63 EarthCARE 63 Meteosat 63 Meteosat satellites 63 Infrared Pathfinder Satellite 63 Advanced Microwave Scanning 63 Ocean Salinity 63 Synthetic Aperture Radar 62 Polar Operational 62 ATV Jules Verne 62 Rosetta comet chaser 62 Galileo constellation 62 Optus D2 62 geosynchronous 62 NASA Stratospheric Observatory 62 JCSAT 9 62 DigitalGlobe WorldView 62 Astrium Satellites 62 CBERS 2B 62 SMOS Soil Moisture 62 ESA ERS 62 MTSAT 1R 62 GPS 2R 62 Express AM# 62 TecSAR 62 Mission TRMM 62 Program DMSP 62 INSAT 3E 61 ESA Planck 61 LEOP 61 Geostationary 61 Astra 3B 61 Satellite GOES 61 Galileo satellites 61 MEASAT 3a 61 Skynet 5B 61 Earth Observation Satellite 61 ASTRA 1KR 61 Lunar Reconnaissance Orbiter LRO 61 Turksat 3A 61 Cryosat 61 NPOESS Preparatory Project 61 Insat 61 ExoMars mission 61 MTSAT 61 PSLV C 61 NAVSTAR Global Positioning System 61 planetary Transits 61 GOSAT 61 Alphabus 61 STSS Demo 61 NROL 60 Geostationary Operational Environmental 60 GIOVE 60 CARTOSAT 2A 60 LISA Pathfinder 60 COSMO SkyMed 60 Proba 2 60 W3A 60 SBSS Block 60 geo stationary satellite 60 ENVISAT 60 HAMSAT 60 Astra 1L 60 PSLV C7 60 TerraSAR X 60 Anik F3 60 KA SAT satellite 60 ROCSAT 2 60 Greenhouse Gases Observing 60 Eutelsat KA SAT 60 Synthetic Aperture Radar SAR 60 ESA SMART 60 Mars Climate Sounder 60 Rosetta orbiter 60 Planetary Transits 60 SIRAL 60 BSAT 3b 60 Earth Observation EO 60 Convection Rotation 60 INSAT satellite 59 TerraSAR X satellite 59 ASTRA 5B 59 Resourcesat 2 59 Ocean Salinity SMOS 59 Meteorological Satellites 59 SCISAT 59 Turksat 4A 59 W2A satellite 59 polarimetric 59 geostationary 59 CALIPSO 59 Oceansat 2 59 GPS Block IIF 59 Full Operational Capability 59 PSLV C# 59 A# spacecraft 59 ESA Envisat 59 TIROS 59 SBIRS HEO 59 geo stationary 59 EUTELSAT 59 Beidou satellite 59 ASTRA 1M 59 AEHF satellite 59 geosynchronous GEO 59 Ozone Monitoring 59 Soyuz launcher 59 orbit GEO 59 Alphasat 59 Satellite Successfully Launched 59 Ariane rocket 59 Sumbandila 59 Orbital Express 59 Spirent GSS# 59 synthetic aperture radar 59 Nimiq 5 59 Atlas IIAS 59 Meteorological Satellite 59 SMOS mission 58 Stratospheric Observatory 58 Thales Alenia 58 Earth orbiting satellites 58 AMPERE 58 INSAT 4CR 58 Eutelsat W2A satellite 58 MUOS satellite 58 Security GMES 58 Delfi C3 58 Geosynchronous orbit 58 WGS satellite 58 ICO G1 satellite 58 Eurostar E# platform 58 Infrared Astronomy 58 Astra 1M 58 EchoStar XIV 58 UK DMC2 58 radar altimeter 58 geostationary satellites 58 Optus D3 58 Herschel Planck 58 GAGAN 58 Telesat Nimiq 58 Paksat 1R 58 GOES satellites 58 L5 signal 58 Foton M2 58 Lunar CRater Observation 58 Satellite GOSAT 58 Eurockot 58 Cartosat 2A 58 WGS satellites 58 System SBIRS 58 Planck satellite 58 spaceborne 58 C NOFS 58 Foton spacecraft 58 GSTB V2 58 CBERS 58 NAVSTAR GPS 58 Eurobird 58 Arabsat 5A 58 INTELSAT 58 NASA Landsat 58 Rockot 58 TDRS K 58 EO IR sensor 58 SBIRS GEO 58 HEO payload 58 COMSATBw 57 KOMPSAT 57 EUROBIRD 57 Proba 57 Ariane launcher 57 Moon Mineralogy Mapper M3 57 Insat 3A 57 INSAT 4B 57 GPS IIF satellites 57 Insat 4A 57 Wideband Global 57 KURS 57 ARISSat 57 geosynchronous communications 57 NAVSTAR 57 Technology Insertion 57 Polar orbiting Operational 57 XTAR EUR 57 NASA GeneSat 1 57 Glonass K 57 RADARSAT 2 57 narrowband tactical 57 modernized IIR 57 orbital rendezvous 57 SICRAL 1B 57 Insat 4B 57 RISAT 2 57 Interior Laboratory GRAIL 57 Envisat satellites 57 Molniya 57 ASCAT 57 Astrosat 57 GOCE 57 Aqua satellite 57 Ofeq 57 Yahsat 1A 57 Pegasus XL 57 HIAPER 57 Suite VIIRS 57 Infrared Astronomy SOFIA 57 NFIRE 57 Launched Successfully 57 VINASAT 1 57 Block IIF 57 LEO satellites 57 Proton Breeze M 57 satellites 57 Geosynchronous 57 Y1A 57 Measat 3a 57 DMSP satellites 57 GSAT 5P 57 Navstar GPS 57 RapidEye constellation 57 STSS satellites 57 Jules Verne ATV 57 orbiting gamma ray 57 PSLV C6 57 Phobos Grunt 57 YES2 57 TECSAR 57 Geo IK 57 Shenzhou spaceships 57 ESA CNES 57 CrIS 57 Rosetta spacecraft 57 geo synchronous 57 SATCOM WGS 57 DIRECTV 7S 57 Mars Color Imager 56 Apstar 56 AN/AAQ-# 56 IASI 56 ST5 56 SUAV 56 geosynchronous satellites 56 Koreasat 6 56 Cartosat 2B 56 situ measurements 56 QZSS 56 STSS Demonstration 56 Philae lander 56 Highly Adaptable Satellite 56 Telstar #R 56 IKONOS 56 KazSat 56 CARTOSAT 56 Skynet 5A 56 RISAT 56 AVHRR 56 Astrium Eurostar 56 AEHF 56 COROT satellite 56 Eutelsat Communications SA 56 SMOS satellite 56 geo synchronous orbit 56 highly elliptical orbit 56 BSAT 3a 56 interplanetary spacecraft 56 Minotaur rocket 56 Oceansat 56 Satellite Launch Vehicle GSLV 56 Mars Reconnaissance Orbiter MRO 56 geosynchronous orbits 56 MP RTIP 56 Express orbiter 56 Vehicle OBV 56 INSAT 4A 56 Aquarius SAC 56 Sinosat 56 W2A 56 DIRECTV 9S 56 ESA Herschel 56 satellite Giove 56 OrbView 3 56 Watchkeeper UAV 56 Cospas Sarsat 56 ESA Envisat satellite 56 Soyuz FG 56 Ku Band 56 NASA Lunar Crater 56 comet chaser 56 radio occultation 56 INSAT 2E 56 System Block IIR 56 High Frequency AEHF 56 Anik F1R 56 Chang'eI 56 EADS Astrium GmbH 56 Minotaur IV 56 Megha Tropiques 56 High Frequency EHF 56 LRO spacecraft 56 Shuttle Radar Topography 56 H IIB 56 equatorial orbit 56 SSETI Express 56 ESA SMOS 56 System MUOS 56 Scatterometer 56 Anik F2 56 Spacebus 56 Vehicle ATV 56 Optus C1 56 antenna reflector 56 D CIXS 56 PSLV C9 56 RazakSAT 56 CryoSat mission 56 COROT 55 Ulysses spacecraft 55 Observing System 55 Based Augmentation System 55 Moderate Resolution Imaging 55 earth orbiting satellites 55 tethered aerostat 55 astrometric 55 Observatory SDO 55 Constellation Observing 55 RQ 7B Shadow 55 Foton M3 55 radiosondes 55 Anik G1 55 GSLV D3 rocket 55 orbital insertion 55 geo stationary orbit 55 Curiosity rover 55 KA SAT 55 GPS IIIA 55 nanosatellite 55 Glonass satellites 55 GPS Block IIR 55 Intelsat Galaxy 55 GLONASS satellites 55 Solar TErrestrial RElations Observatory 55 coastal Naro 55 remote sensing satellite Resourcesat 55 Intelsat IS 55 Block IIIA 55 Léopold Eyharts 55 POES satellites 55 Yuri Lonchakov 55 MQ 8B 55 SAFIR 55 EuroHawk 55 GOES R 55 ASTRA 1N 55 NASA THEMIS 55 Planck spacecraft 55 Environmental Satellites POES 55 Mission SRTM 55 interferometric synthetic aperture radar 55 Kayser Threde 55 Meteorology Ionosphere 55 Lunar Orbiter Laser Altimeter 55 Meteosat Second Generation 55 ICO G1 55 GPS IIIA satellite 55 Michibiki 55 JCTD 55 MEASAT 3a satellite 55 VINASAT 55 Block IIR 55 RESOURCESAT 55 infrared observatory 55 ESA Rosetta 55 W7 satellite 55 ILS Proton Breeze 55 ESA CryoSat 55 Kiruna Sweden 55 Koreasat 55 Arianespace Ariane 5 55 SATCOM WGS satellite 55 datalink 55 PSLV rocket 55 WISE infrared 55 scatterometer 55 Vehicle UAV 55 geostationary earth 55 Arabsat 4A 55 Solar Orbiter 55 Sun synchronous orbit 55 W2M satellite 55 electric ion propulsion 55 aboard Envisat 55 Lars Prahm 55 onboard Chandrayaan 55 VIIRS 55 Wide Area Augmentation 55 KSLV 1 55 Telstar #N 55 NASA Ares IX 55 TDRSS 55 GLAST spacecraft 55 JCSAT 55 Plesetsk Cosmodrome 55 Anik F2 satellite 55 SAT DSA 55 Quasi Zenith Satellite 55 Globalstar satellites 55 Observatory STEREO 55 POES 55 SES WORLD SKIES NSS 55 SBSS satellite 55 Servicing Mission 55 satellite RISAT 55 Atlas 2AS 55 Space Telescope GLAST 54 Inertial Navigation System 54 unmanned rotorcraft 54 UAVSAR 54 Vandenberg AFB Calif. 54 Recovery Experiment SRE 54 inertial measurement unit 54 NASA STEREO 54 Predator UAV 54 geo synchronous transfer 54 Simonetta Di Pippo 54 Insat 4CR 54 Imaging Spectrometer 54 Azerspace 54 Atmospheric Infrared Sounder 54 CHIPSat 54 SPACEWAY TM 54 Pressurized Module 54 E 8C 54 CloudSat 54 LAGEOS 54 Milstar satellites 54 Yahsat Y1A 54 NSPO 54 QuikSCAT 54 Satellite Launch 54 ESA Earth Observation 54 Solar Backscatter Ultraviolet 54 DSCS III 54 nexgen 54 Leopold Eyharts 54 Gorgon Stare 54 NASA EPOXI mission 54 O OREOS 54 nanosatellites 54 NASA Far Ultraviolet 54 Fregat upper stage 54 TSIS 54 orbiter Mars Odyssey 54 Palapa D 54 Intelsat satellites 54 ATV Johannes Kepler 54 Heterodyne Instrument 54 Starsem 54 ROSAT 54 space module Tiangong 54 Hubble Space Telescope HST 54 AN/APG-# 54 ESTRACK 54 weather satellite TIROS 54 nEUROn 54 aboard SpaceX Falcon 54 COSPAR 54 National Polar Orbiting 54 entire Milstar constellation 54 Magnetospheric 54 MALE UAV 54 aboard ESA Envisat 54 Mobile User Objective 54 electro optical sensor 54 ILS Proton 54 inertial navigation system 54 Optus D1 54 System QZSS 54 Block 5D 54 Wideband Gapfiller Satellite 54 kg Resourcesat 2 54 WindTracer 54 Uninhabited Aerial Vehicle 54 steerable beam 54 Baikonur spaceport 54 NigeriaSat 54 unmanned spaceplane 54 Shenzhou VIII 54 Unmanned Aircraft System 54 AIRS instrument 54 ESA ESTEC 54 SPY 1F 54 Project Wedgetail 54 Alexander Zelin 54 Envisat satellite 54 Su #MKI aircraft 54 Gamma ray Large 54 satID 54 Glonass navigation 54 Glonass M 54 Hotbird 54 Landsat Data 54 Orbiting Carbon Observatory OCO 54 W3B satellite 54 laser altimeter 54 LMCSS 54 NuSTAR 54 Antenna LISA 54 CALIPSO satellites 54 Advanced Synthetic Aperture 54 NH# TTH 54 Relative Navigation 54 DMSP F 54 Youthsat 54 laser designator 54 Vehicle PSLV C# 54 Nimiq 4 54 EPOCh 54 Chinasat 6B 54 manned Shenzhou 54 MUOS satellites 54 inertial guidance 54 ExoMars rover 54 Control AEW 53 SumbandilaSat 53 IRNSS 53 Stratellite 53 WGS Block 53 airborne observatory 53 Continuity Mission LDCM 53 XTAR EUR satellite 53 DMSP F# 53 Wideband Gapfiller 53 Composite Infrared Spectrometer 53 deorbiting 53 INSAT 53 Kazakhstan Baikonur Cosmodrome 53 ESA ESOC 53 Jupiter Icy Moons Orbiter 53 geosynchronous transfer orbit 53 twin STEREO spacecraft 53 Radar Imaging 53 ADM Aeolus 53 Kourou French Guyana 53 Environmental Satellite POES 53 Radar G ATOR 53 Long Baseline Interferometry 53 Bulava submarine launched 53 Radiation Dose Monitor 53 Vinasat 53 SSM# 53 Infrared Camera 53 UKIRT 53 Kepler observatory 53 Soyuz #S 53 Synthetic Aperture 53 infrared astronomy 53 Planck telescope 53 astronauts Hans Schlegel 53 NPO Lavochkin 53 Space Shuttle STS 53 System GLONASS 53 Solar Dynamics Observatory 53 unpiloted 53 remote sensing satellites 53 STEREO 53 AIRSS 53 Vehicle PSLV 53 Glonass satellite 53 Tropical Rainfall Measuring 53 Eurobot 53 Spectroradiometer MODIS 53 RASCOM 53 Jules Verne Automated Transfer 53 radars telemetry 53 Geo synchronous 53 DSCS 53 Cartosat 53 Ariane 5G 53 SES Americom AMC 53 Dnepr rocket 53 Nowcasting 53 Reaches Orbit 53 WebTAS 53 SIM PlanetQuest 53 National d' Etudes 53 STPSat 53 NASA Orbiting Carbon 53 geostationary communications 53 Envisat 53 downlinks 53 SOHO spacecraft 53 propulsion subsystem 53 experimental payloads 53 SkySat 53 PSLV C8 53 Satellite System NPOESS 53 JPSS 53 orbiting observatories 53 Kosmos 3M rocket 53 orbiter Cassini 53 Plesetsk space 53 NASA Wilkinson Microwave 53 LCROSS Lunar Crater Observation 53 Program MP RTIP 53 GLONASS constellation 53 STEREO spacecraft 53 Laser Interferometer Space 53 Venus Climate Orbiter 53 Imaging Spectroradiometer MODIS instrument 53 Navigation Satellite 53 Advanced EHF 53 Automated Transfer Vehicle 53 EPOCH IPS 53 Low Altitude 53 Instrument OMI 53 Joint Capability 53 SBIRS 53 Yaogan 53 Rasad 53 endo atmospheric 53 Phased array 53 lunar orbiter Chang'e 53 Simonetta Di Pippo ESA 53 CNES 53 Spatiales 53 RQ 4B 53 HDAM 53 Airborne Topographic Mapper 53 CryoSat satellite 53 Omid Hope 53 probe Chang'e 53 AN/FPS-# 53 Watchkeeper 53 Ares Orion 53 Mission TRMM satellite 53 ESO VLT 53 UCAV 53 Spaceway F1 53 Theater Ballistic Missile 53 Mid Infrared 53 Vehicle PSLV C9 53 Vehicle GSLV 53 LADEE 53 Esrange 53 AAI Shadow 53 ALOS 53 Shenzhou V spacecraft 53 Telstar #N satellite 53 TRMM satellite 53 PARASOL 53 GLONASS M 53 Japan Kibo laboratory 53 Eutelsat HOT BIRD 53 radiometer 53 AKARI 53 geosynchronous orbit GEO 53 Optus D3 satellite 53 Plesetsk 53 Satellite Launch Vehicle 53 Orbiter spacecraft 53 Resourcesat 53 ADAHRS 53 Chandrayaan II 53 ELINT 53 Payloads 53 Missile Warning 53 radiosonde 53 Chinasat 9 53 Kepler spacecraft 53 Technology Demonstrator 53 Sounder AIRS instrument 53 COSPAS SARSAT 53 Thermal Emission Spectrometer 53 multipurpose Arirang 3 53 Atmospheric Infrared Sounder AIRS 53 JIMO 53 INSAT satellites 53 NASAs 53 Airborne Laser Testbed 53 Hubble gyroscopes 52 ProtoStar II 52 Redu Belgium 52 Japanese Experiment Module 52 Multispectral 52 ARCTUS 52 Vehicles UAVs 52 NASA Gamma ray 52 kg payload 52 Space Fence 52 Technology Demonstration JCTD 52 NH# NFH 52 XTAR 52 Resurs 52 satellite GSAT 52 Baikonour 52 ISS Reshetnev 52 DAGR 52 Smos 52 WISE spacecraft 52 Atlantis undocks 52 SCIAMACHY 52 Spectroradiometer 52 NFIRE satellite 52 geostationary transfer 52 Interferometer 52 Egnos 52 ASTRA 5A 52 Soyuz rocket carrying 52 KSLV 52 AMSR E 52 Spectrograph 52 Europa Orbiter 52 Orbit Validation 52 hyperspectral imager 52 geostationary orbits 52 Operation IceBridge 52 EchoStar XV 52 enters lunar orbit 52 Dmitri Kondratyev 52 Roman Romanenko 52 DubaiSat 52 GSLV rocket 52 German SAR Lupe 52 SATLYNX 52 Facility SIRTF 52 satellite Omid Hope 52 Mars Pathfinder lander 52 INMARSAT 52 VLBI 52 remote sensing satellite 52 ISRO Polar 52 ray Space Telescope 52 T #TS 52 Sofradir 52 Ocean Surface Topography 52 SRON 52 Alpha Magnetic Spectrometer AMS 52 Rockot launcher 52 Communications System DSCS 52 AN/TPY-2 52 VIRTIS 52 breathing supersonic combustion 52 supersonic combustion 52 fiber optic gyroscopes 52 Astrium GmbH 52 orbiting spacecraft 52 TORU 52 Spatiales CNES 52 THAAD radar 52 ICESat 52 Awacs 52 Interferometric 52 Air Missile AMRAAM 52 cryocooler 52 Dnepr rocket carrying 52 Greenbelt Md. manages 52 Mars Surveyor 52 Volker Liebig 52 INSAT 4C 52 Launch Vehicle EELV 52 Shadow Tactical Unmanned 52 NSAB 52 HEO payloads 52 eyepiece #/#s f/#.# 52 Navy P 3C 52 GeoForschungsZentrum Potsdam 52 AN/TPS-# 52 shuttle Endeavour STS 52 MEO satellites 52 ASTRA 2B 52 intratheater airlift 52 Fengyun 2D 52 Phased Array 52 BBSNews #-#-# NASA 52 ESA Automated Transfer 52 Plesetsk cosmodrome 52 Orbiter LRO 52 QWIP 52 Sriharikota Andhra Pradesh 52 CubeSat 52 GSLV F# carrying 52 Spacelab 52 High Resolution Imaging 52 Total Ozone Mapping 52 LITENING 52 array AESA 52 System WAAS 52 Globalstar constellation 52 GPS IIF satellite 52 e VLBI 52 LCROSS Observation Campaign 52 ESA GOCE 52 SES Sirius 52 NESDIS 52 SatNews 52 uncrewed 52 Aerojet propulsion 52 OSIRIS REx 52 Faint Object 52 electro optic sensors 52 multisensor 52 Interorbital Systems 52 Yuri Shargin 52 Climate Sounder 52 XMM Newton X ray 52 EDXRF 52 Launch Scrubbed 52 vehicle PSLV C# 52 GloPac 52 Short Range Ballistic 52 X #A Waverider 52 CX OLEV 52 Autonomic Logistics Information 52 Russian Soyuz Fregat 52 Herschel Space 52 microsatellites 52 AIM #D 52 Environment Explorer LADEE 52 MErcury Surface Space ENvironment 52 OG2 satellites 52 Titan flyby 52 VASIMR 52 C1XS 52 ESTEC 52 Rockot launch 52 Solar Sail 52 NOAA Geostationary Operational 52 hypersonic scramjet 52 Broadcast ADS 52 Alexander Vorobyov spokesman 52 GMES 52 STP S# 52 ARABSAT 52 Readiness Review 52 Kosmotras 52 IBEX spacecraft 52 Sensis MDS 52 Mars Odyssey spacecraft 52 Global Precipitation Measurement 52 Evolved Sea 52 LEAP X1C 52 HC #A 52 COSPAS 52 Spacecraft Operations 52 NASA WMAP 52 Samokutyayev 52 Radar ASAR instrument 52 International Astronautical Federation 51 DEIMOS 51 Geo Synchronous Satellite Launch 51 ILS Proton Successfully Launches 51 SPACEWAY 3 51 WATCHKEEPER 51 Orbit Validation Element 51 Rokot 51 Sparrow Missile 51 RQ 4B Global 51 radar altimeters 51 THEMIS mission 51 SARSAT 51 Fucino 51 Skripochka 51 Cubesat 51 Esrange Space Center 51 GSLV Mk III 51 successfully undocked 51 ASKAP 51 Spectrometer 51 Relations Observatory STEREO 51 SIRTF 51 altimetry 51 Milstar constellation 51 remote sensing payloads 51 airborne remote sensing 51 KAGUYA 51 agency CNES 51 hypersonic missile 51 Lunar Reconnaissance Orbiter 51 STATION Fla. 51 Anisotropy Probe WMAP 51 Satellite Aided Tracking 51 Eutelsat Communications 51 AIM 9X Sidewinder 51 Hyperspectral Imager 51 spacecraft orbiting 51 unpowered glide 51 MEXSAT 51 shuttle Discovery STS 51 inertial measurement 51 Space Infrared Telescope 51 RQ 4N 51 Air Combat Maneuvering 51 Polar Satellite Launch 51 LAPAN 51 Astro E2 51 Cargo Launch Vehicle 51 AESA Radar 51 Medspiration 51 geo stationary satellites 51 SpaceX Dragon 51 APXS 51 Earth Observation satellites 51 SurfBeam 51 Solar Optical Telescope 51 WAAS EGNOS 51 Heliospheric 51 geosynchronous satellite launch 51 GEOSS 51 microwave radiometer 51 satellite 51 TCDL 51 Remote Sensing Satellite 51 P Churyumov Gerasimenko 51 Alpha Particle 51 Climate Experiment GRACE 51 Pad Abort 1 51 Anik F1 51 ephemeris 51 endurance UAV 51 OSIRIS 51 Spacecraft Control 51 GOES EAST 51 manned Soyuz 51 DigitalGlobe WorldView 2 51 Earth Observation System 51 NASA Stardust spacecraft 51 Australian SKA Pathfinder 51 Space ENvironment GEochemistry 51 Orbiter MRO 51 NASA GLAST 51 Agency JAXA 51 Moon Mineralogy Mapper 51 ESA Proba 51 Briz M booster 51 Envisat Advanced Synthetic Aperture 51 Gaele Winters 51 System TSAT 51 CETel 51 Anti Submarine Warfare ASW 51 Muchachos Observatory 51 PSLV C# rocket 51 Soil Moisture 51 Phobos Grunt mission 51 TSN PZ camera 51 SESG 51 BRAHMOS 51 Commander Sergei Volkov 51 Aerosonde Mark 51 CoRoT 51 datalinks 51 imaging spectrometer 51 Climate Experiment SORCE 51 Baykonur 51 GRAIL 51 track Infrared Sounder 51 Differential GPS 51 THAICOM 51 Envisat ASAR 51 MEASAT Satellite Systems 51 Human Spaceflight Microgravity 51 Cygnus spacecraft 51 ExoMars Trace Gas 51 AATSR 51 Landsat satellites