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| Astronomy and Astrophysics |
| Attitude and Articulation Control Subsystem |
| Anglo-Australian Observatory |
| American Astronomical Society |
| American Astronautical Society |
| American Association of Variable Star Observers |
| Atlas Centaur |
| Advanced Composition Explorer |
| Automated Control Function |
| Active Cavity Radiometer |
| ACR Irradiance Monitor |
| Assured Crew Return Vehicle |
| Astronaut Crew Rescue Vehicle |
| Advanced Communications Technology Satellite |
| Advanced Earth Observing Satellite |
| Ames-Dryden Flight Research Facility |
| Astrophysical Data System (at Havard-Smithsonian CfA) |
| Aitken Double Star catalog |
| Arianespace SA, Paris |
| Atmospheric Emissions Photometric Imaging |
| Air Force |
| USAF's ETR |
| Air Force Global Weather Center |
| Air Force Program |
| Air Force Plan Representative Office |
| Advanced FRSI |
| USAF's WTR |
| Asymptotic Giant Branch |
| Auxiliary Ground Equipment |
| Active Galactic Nucleus |
| American Geophysical Union |
| American Institute of Aeronautics and Astronautics |
| Astronomical Image Processing System |
| Atmospheric Infrared Sounder |
| Astronomical Journal |
| Atmospheric Lyman-Alpha Emissions |
| Advanced Launch Development Program |
| Array of Low Energy X-ray Imaging Sensors |
| Association of Lunar and Planetary Observers |
| Advanced Launch System |
| Air Force Maui Optical System |
| Advanced Microwave Sounding Radiometer |
| American National Standards Institute |
| Abort Once Around (shuttle abort plan) |
| Angle Of Attack |
| Attitude and Orbit Control System |
| Auroral Photography Experiment |
| Astrophysical Journal |
| Applied Physics Laboratory (at Johns Hopkins) |
| Attached Pressurized Module (a.k.a. Columbus) |
| Atmospheric Particle Monitor |
| Automatic Picture Transmission |
| Automatic Photoelectric Telescope |
| Auxiliary Power Unit |
| Ames Research Center (NASA) |
| Astrophysical Research Consortium |
| Applications and Research Involving Space Technologies Observing the Earth's Field from Low Earth Orbiting Satellite |
| American Radio Relay League |
| Advanced Relay TEchnology MISsion |
| Astronomical Society of the Atlantic |
| Arab Satellite Communications Organization |
| Advanced Space Engine |
| Assembly of Station by EVA Methods |
| Agenzia Spaziale Italiano |
| Astronomical Society of the Pacific |
| Advanced Solid Rocket Motor |
| Antenna Support Structure |
| Advanced Spaceborne Thermal Emission and Reflection |
| Space astrophysics laboratory |
| Alternate Transoceanic Abort Landing |
| Active Thermal Control System |
| Advanced Tracking and Data Relay Satellite |
| Atmospheric Laboratory for Applications and Science |
| Amateur Telescope Maker |
| Apollo Telescope Mount (on Skylab) |
| Atmospheric Trace Molecule Spectroscopy |
| Abort To Orbit |
| Along Track Scanning Radiometer |
| Astronomical Unit |
| Association of Universities for Research in Astronomy |
| Advanced Very High Resolution Radiometer |
| Aviation Week and Space Technology |
| Advanced X-ray Astrophysics Facility |
| British Aerospace |
| Burst And Transient Source Experiment |
| Broad-Band X-Ray Telescope |
| Bolometric Correction |
| Bonner Durchmusterung (catalog) |
| Big Dumb Booster |
| Booster Engine Cutoff |
| Bug-Eyed Monster |
| Backup Flight Computer |
| Backup Flight Control System |
| Backup Flight System |
| Black Hole |
| Berkeley Illinois Maryland Array |
| Bioserve-Instrumentation Technology Associate Materials Dispersion Analysis |
| Ballistic Missile Defense Office |
| Bundesministerium fuer Forschung und Technologie |
| British National Space Centre |
| Communications & Tracking |
| Communications and Data Handling |
| Center for Astrophysical Research in Antarctica |
| Canadian Astronomical Society |
| Saturn orbiter and Titan probe |
| Cheap Access To Space |
| Cosmic Background Radiation |
| Cape Canaveral Air Force Station |
| Charge-Coupled Device |
| Centers for the Commercial Development of Space |
| Canada Centre for Remote Sensing |
| Consultative Committee for Space Data Systems |
| Command and Data Acquisition |
| Countdown demonstration Test |
| Cold Dark Matter |
| Compact Disk Read-Only Memory |
| Command and Data Subsystem |
| Center for EUV Astrophysics |
| Controlled Ecological Life Support System |
| Clouds and Earth's Radiant Energy System |
| Crew and Equipment Translation Aid |
| Harvard-Smithsonian Center For Astrophysics |
| ChloroFluoroCarbon |
| Columbus Free Flyer |
| Canada-France-Hawaii Telescope |
| Center For Particle Astrophysics (Berkeley) |
| Carbon Fibre Reinforced Plastic |
| Center of Gravity |
| Crystal Growth Furnace |
| Compton Gamma Ray Observatory |
| Center for High Angular Resolution Astronomy |
| Cryogenic InfraRed Radiance Instrument for Shuttle |
| Commonwealth of Independent States |
| Circumstellar Imaging Telescope |
| Canadian Institute for Theoretical Astrophysics |
| Cargo Integration Test Equipment |
| Cryogenic Limb Array Etalon Spectrometer |
| Command Module |
| Center of Mass |
| Central Meridian |
| Cosmic Microwave Background |
| Cosmic Microwave Background Radiation |
| Central Mission Control Centre |
| Centre National d'Etude Spatiales |
| Carbon-Nitrogen-Oxygen |
| Comet Nucleus Sample Return |
| COsmic Background Explorer |
| COMPton TELescope |
| Communications Satellite (Corporation) |
| Corrective Optics Space Telescope Axial Replacement |
| Commercial Protein Crystal Growth |
| Correlation Radiometer |
| Comet Rendezvous/Asteroid Flyby |
| Cosmic Radiation Effects and Activatiom Monitor |
| Commercial Refrigerator Incubator Module |
| Cryogenic Infrared Spectrometer Telescope for Atmosphere |
| Communication Research Lab |
| Combined Release/Radiation Effects Satellite |
| Canadian Space Agency |
| Commonwealth Scientific and Industrial Research Organization |
| Command and Service Module |
| Consolidated Satellite Test Center |
| Cerro Tololo Interamerican Observatory |
| Cataclysmic Variable |
| Cosmic X-ray Background Radiation |
| Cape York Space Base |
| Cape York Space Facility |
| Cape York Space Port |
| Coastal Zone Color Scanner |
| Delayed Action Command |
| DATA Acquisition and Control Subsystem |
| Dominion Astrophysical Observatory |
| Deutsche Agentur fuer Raumfahrtangelegenheiten |
| Defense Advanced Research Projects Agency |
| Delta Clipper |
| Defense Communications Agency |
| Dynamic Cell Culture System |
| Delta Clipper eXperimental |
| DC-to-DC Converter Unit |
| Design, Development, Test, and Evaluation |
| Declination |
| Desaturation |
| Dryden Flight Research Center |
| Dryden Flight Research Facility |
| Diffuse Infrared Background Experiment |
| Deutsche Forschungsanstalt fuer Luft- und Raumfahrt |
| Dark Matter |
| Differential Microwave Radiometer |
| Defense Meteorological Satellite Program |
| Department Of Defense |
| Department Of Energy |
| Department of Education |
| Department of the Environment |
| Domestic Satellite |
| Differenced One-way Range |
| Department Of Transportation |
| Drop Physics Module |
| DATA Processing Services Subsystem |
| Dominion Radio Astrophysical Observatory |
| DATA Relay Satellite System |
| Defense Satellite Communications System |
| Deep Space Network |
| Detailed Supplementary Objective |
| Defense Support Program |
| Deep Space Station |
| Deep Space Station Complex |
| Elliptical (for galaxies) |
| Edwards Air Force Base |
| Environmental Control System |
| EROS Data Center |
| Extended Duration Orbiter |
| EDO Medical Project |
| European Data Relay Satellite |
| Electronic Data Systems |
| Energetic Gamma Ray Experiment Telescope |
| Electronic Journal of the Astronomical Society of the Atlantic |
| European Launcher Development Organisation |
| Expendable Launch Vehicle |
| Extravehicular Mobility Unit |
| Energetic Neutral Atom Camera |
| ENAC for EOS |
| Energetic Neutral Atom Precipitation |
| El Nino/Southern Oscillation |
| Earth Observation Data Centre |
| Earth Observing System |
| Electrophoresis Operations in Space |
| Earth Observing Scanning Polarimeter |
| Energetic Particles Detector |
| Eastern Range |
| Earth Radiation Budget Experiment |
| Earth Resources Observations System |
| Earth Resources Satellite |
| European Remote Sensing |
| Environmental Research Satellite |
| European Space Agency |
| European Space Information System |
| European Southern Observatory |
| European Space Operations Centre |
| European Space Power Conference |
| European Space Research Institute |
| European Space Research Organisation |
| European Space Research and Technology Centre |
| External Tank |
| Ephemeris Time |
| End-to-End |
| Enhanced Thematic Mapper |
| Eastern Test Range |
| European Meterological Satellite Organisation |
| European Retrievable Carrier |
| European Telecommunications Satellite Organization |
| Extreme UltraViolet |
| Extreme UltraViolet Explorer |
| Extravehicular Activity |
| Freedom Attached Payloads |
| Fast Auroral SnapshoT explorer |
| Fuel Bleed Valve |
| Flight-Engineering Model |
| Free-Flyer Control Centre |
| Fast Fourier Transform |
| Fine Guidance Sensors |
| Fixed Head Star Trackers |
| Far InfraRed |
| Far InfraRed Absolute Spectrophotometer |
| Flexible Image Transport System |
| Faint Object Camera |
| Federally-Owned LANDSAT Data |
| Faint Object Spectrograph |
| Flight Projects Directorate |
| Fiber Pulling in Microgravity |
| Flight Research Center |
| Space Station Freedom |
| Flight Readiness Firing |
| Flight-Readiness Review |
| Flexible Reusable Surface Insulation |
| Flight Telerobotic Servicer |
| Far Ultraviolet Spectroscopic Explorer |
| Full Width at Half Maximum |
| Get-Away Special |
| Green Bank Telescope |
| Galactic Center |
| Globular Cluster |
| General Catalog of Variable Stars |
| General Dynamics Commercial Launch Services |
| Great Dark Spot |
| Giotto Extended Mission |
| Graphite Epoxy Motor |
| Geosynchronous Earth Orbit |
| Ground-based Electro-optical Deep-space Surveillance System |
| Goskogidromet/Gidromettsentr |
| Greenwich Hour Angle |
| Goddard High Resolution Spectrograph |
| Graphics Interchange Format |
| Goddard Institute for Space Studies |
| Global Low-Orbiting Message Relay |
| Giant Molecular Cloud |
| Giant Meter-wave Radio Telescope |
| Geostationary Meterological Satellite |
| Greenwich Mean Time |
| Guidance, Navigation, and Control |
| Geostationary Orbiting Environmental Satellite |
| Global Ozone Monitoring by Occultation of Stars |
| Global Ozone Monitoring Radiometer |
| Gelation of Soils: Applied Microgravity Research |
| Gaseous OXygen |
| General Purpose Computer |
| Gravitational Plant Physiology Facility |
| Global Positioning System |
| General Relativity |
| Gamma Ray Observatory |
| Gamma Ray Spectrometer |
| Great Red Spot |
| Glide RTLS |
| Glavnoye Razvedivatel'noye Upravileniye |
| Guide Star Catalog |
| Goddard Space Flight Center |
| GeoSynchronous earth Orbit |
| Greenwich Sidereal Time |
| Geostationary Transfer Orbit |
| Glavnoye Upravileniye Geodesii i Kartografii |
| High Accuracy Inertial Navigation System |
| Halogen Occultation Experiment |
| High Altitude Observatory |
| Horizontal Branch |
| Highes Communications, Inc |
| Heat Capacity Mapping Mission |
| Henry Draper catalog entry |
| Henry Draper Extension |
| Hot Dark Matter |
| High Energy Astronomical Observatory |
| Hermes Robotic Arm |
| High Frequency |
| High Gain Antenna |
| Hitchhiker |
| High Resolution Dynamics Limb Sounder |
| High Resolution Imaging Spectrometer |
| High Resolution Infrared Radiation Sounder |
| Helicentric Julian Date |
| Heavy Lift Capability |
| Heavy Lift Vehicle |
| Halley Multicolor Camera |
| HOrizontal TakeOff and Landing |
| High Pressure Fuel Turbopump |
| High Pressure Oxidizer Turbopump |
| Hertzsprung-Russell |
| High Resolution Doppler Imager |
| High Resolution Imager |
| High Resolution Microwave Survey |
| High Resolution Picture Transmission |
| High Resolution Stereo Camera |
| High-temperature Reusable Surface Insulation |
| High-Resolution Scanning Radiometer |
| High Speed Photometer |
| Hubble Space Telescope |
| Horizontal Takeoff Horizontal Landing |
| Horizontal Takeoff Vertical Landing |
| Hopkins Ultraviolet Telescope |
| High Voltage |
| International Amateur/Professional Photoelectric Photometry |
| International Astronomical Union |
| IAU Circular |
| Infrared Background Signature Survey |
| Index Catalog |
| International Cometary Explorer |
| International Dark-sky Association |
| Interactive Data Language |
| Integrated Furnace Experiment Assembly |
| International Geosphere/Biosphere Programme |
| InterGalactic Medium |
| International Geophysical Year |
| Institut Kosmischeskikh Issledovaniya |
| International Microgravity Lab |
| International Meteor Organization |
| Inertial Measurement Unit |
| Integrated Communications Officer |
| International Maritime Satellite |
| International Telecommunications Satellite |
| Institute Of Astronomy (Cambridge) |
| In Ocean By Mistake |
| In-Orbit Checkout and Calibration |
| Infrared-Optical Telescope Array |
| International Occultation Timing Association |
| Infrared Processing & Analysis Center |
| Investigations into Polymer Membrane Processing |
| Inertial Pointing System |
| InfraRed |
| Image Reduction and Analysis Facility |
| InfraRed Astronomical Satellite |
| Inhibited Red Fuming Nitric Acid |
| Improved Stratospheric and Mesospheric Sounder |
| Institute of Space AND Astronautical Science |
| Isolated/Stabilized Exercise Platform |
| InterStellar Medium |
| Imaging Spectrometic Observatory |
| Infrared Space Observatory |
| International Standards Organization |
| International Solar Polar Mission |
| Indian Space Research Organisation |
| Institute for Space and Terrestrial Science |
| International Space University |
| International Space Year |
| Iskusstvenniy Sputnik Zemli |
| International Ultraviolet Explorer |
| Inertial Upper Stage |
| Interface Verification Test |
| JSC Avionics Engineering Laboratory |
| James Clerk Maxwell Telescope |
| Julian Date; Julian Day (Number) |
| Japanese Experiment Module |
| Japanese Earth Resources Satellite |
| Journal of Geophysical Research |
| Joint Institute for Laboratory Astrophysics |
| Jet Propulsion Laboratory |
| Johnson Space Center |
| Kuiper Airborne Observatory |
| Construction Bureau |
| Kometen, Planetoiden, Meteore |
| Kitt Peak National Observatory |
| Kennedy Space Center |
| Cretaceous-Tertiary Boundary |
| Laser Geodynamics Satellite |
| Los Alamos National Laboratory |
| Langley Research Center |
| Large Angle Spectrometric Coronograph |
| Launch Complex |
| Long Duration Exposure Facility |
| On-line Earthnet Data Access |
| Lunar Excursion Module |
| Low Earth Orbit |
| Lewis Research Center |
| Large Earth-based Solar Telescope |
| Large Format Camera |
| Low Gain Antenna |
| Little Green Men |
| Liquid Hydrogen |
| Local Hour Angle |
| Lightning Imaging Sensor |
| Lawrence-Livermore National Laboratory |
| Lunar Module |
| Large Magellanic Cloud |
| Liquid Nitrogen |
| Liquid OXygen |
| La Palma Observatory |
| Long Period Variable |
| Liquid Rocket Booster |
| Low-temperature Reusable Surface Insulation |
| Local Standard of Rest |
| Local Sidereal Time |
| Lunar Transient Phenomenon |
| Light Year (usu. ly) |
| Messier |
| MAssive Compact Halo Object |
| Monopoles, Astrophysics, and Cosmic Ray Observatory |
| Modular Attitude Control System |
| Series of Soviet Mars spacecraft |
| Millimeter-wave Atmospheric Sounder |
| Manned Base |
| Messerschmitt-Belkow-Blohm |
| Mission Control Center |
| Maragone Convection on Closed Containers |
| McDonnell Douglas Space Systems Corp |
| Main Engine CutOff |
| Mission Elapsed Time |
| Mars Excursion Vehicle |
| Misson From Planet Earth |
| Main Fuel Valve |
| Multifrequency Imaging Microwave Radiometer |
| Multiangle Imaging Spectro-Radiometer |
| Ministry of International Trade and Industry |
| Modified Julian Date |
| Mobile Launcher |
| Multi-Layer Insulation |
| Mobile Launch Platform |
| Microwave Limb Sounder |
| Mission Management and Control Centre |
| MonoMethyl Hydrazine |
| Mission Management and Planning Office |
| Multi-mission Modular Spacecraft |
| Multiple Mirror Telescope |
| Manned Maneuvering Unit |
| Monthly Notices of the Royal Astronomical Society |
| Mars Observer Camera |
| Middeck Zero-Gravity Dynamics Experiment |
| Moderate Resolution Imaging Spectrometer |
| MODIS-Nadir |
| MODIS-Tilt |
| Manned Orbiting Laboratory |
| Mars Observer Laser Altimeter |
| Modular Optoelectronic Multispectral/Stereo Scanner |
| Manned Orbital Maneuvering Vehicle |
| Measurements of Pollution in the Troposphere |
| Manned Orbital Transfer Vehicle |
| Minor Planets Circular |
| Multi-Purpose Experiment Canister |
| Multiple Purpose Experiment Support Structure |
| Medium Resolution Infrared Radiometer |
| Memory Read-Out |
| Mars Rover and Sample Return |
| Mars Rover and Sample Return Mission |
| Main Sequence |
| Marshall Space Flight Center |
| Multisatellite Operations Control Center |
| Multispectral Scanner |
| Microwave Sounding Unit |
| Man Tended Capability |
| Columbus Man-Tended Free-Flyer |
| Mission To Planet Earth |
| Microgravity Vestibular Investigation |
| National Advisory Committee on Aeronautics |
| Numerical Aerodynamic Simulation |
| National Aeronautics and Space Administration |
| NAtional Space Development Agency |
| National Air and Space Museum |
| National AeroSpace Plane |
| National Bureau of Standards |
| NASP Derived Vehicle |
| Nuclear Engine for Rocket Vehicle Application |
| National Environmental Satellite Data and Information Service. |
| New General Catalog |
| NASA Ground Terminal |
| Near Infrared Camera/Multi Object Spectrometer |
| Near Infrared Mapping Spectrometer |
| Near InfraRed |
| National Institute for Standards and Technology |
| National Launch Development Program |
| National Oceanic and Atmospheric Administration |
| National Optical Astronomy Observatories |
| Network Operations Control Center |
| NORth American aerospace Defense |
| Scientific Production Organization |
| NPO Energiya |
| NPO Prikladnoi Mekhaniki |
| National Radio Astronomy Observatory |
| Naval Research Laboratory |
| National Reconnaissance Office |
| National Remote Sensing Centre |
| National Remote Sensing Centre |
| Neutron Star |
| National Security Agency |
| National Science Foundation |
| NASA Science Internet / NASA Standard Initiator / National Environmental Satellite Data and Information Service |
| National Solar Observatory |
| National Space Science Data Center |
| Nuclear Thermal Rocket(ry) |
| New Technology Telescope |
| Orbiting Astronomical Observatory |
| Orbital Acceleration Research Experiment |
| Organic Crystal Growth Facility |
| Office of Commercial Space Transportation |
| Ocean Color and Temperature Scanner |
| Optical Communications Through the shuttle Window |
| Orbiting Geosurvey Observatories |
| Office of Management and Budget |
| Orbiter Maintenance Down Period |
| Orbital Maneuvering System |
| Orbiter Processing Facility |
| Stock ticker symbol for OSC |
| Orbiting and Retrievable Far and Extreme Ultraviolet Spectrometer |
| Orbital Sciences Corporation |
| Orbiting Satellite Carrying Amateur Radio |
| Office of the Space Station |
| Office of Space Science and Applications |
| Oriented Scintillation Spectrometer Experiment |
| Office of Science and Technology Policy |
| Optical Telescope Assembly |
| Oscillatory Thermocapillary Flow Experiment |
| Over The Horizon Backscatter |
| Orbital Transfer Vehicle |
| Orbital Vehicle |
| Payload Assist Module |
| Payload Assist Module, Delta-class |
| Physiological and Anatomical Rodent Experiment |
| Primary Avionics Software System |
| ParseC (usu. pc) |
| Protein Crystal Growth experiment |
| PCG Glovebox |
| Photometric Calibration Test |
| Particle Dispersion Experiment |
| Payload Deployment and Retrieval System |
| Planetary Data System |
| Payload Electronics Module |
| Particle Environment Monitor |
| Physics and Astronomy |
| Principal Investigator |
| Payload Bay |
| Payload Bay Doors |
| Portable Life Support System |
| Pressurized Module |
| Permanently Manned Capability |
| Pressure Modulated InfraRed Radiometer |
| Pre-Main Sequence |
| PhotoMultiplier Tube |
| Planetary Nebula |
| Payload/Platform Operations Control Center |
| Polar Orbiting Earth Mission |
| PO Polyot |
| Columbus Polar Platform |
| Positions and Proper Motions (catalog) |
| Powered RTLS |
| Point Spread Function |
| PulSaR |
| Passive Thermal Control |
| Photovoltaic |
| Pioneer Venus Orbiter / Protivo-Vosdushniya Oborona |
| Quasi-Stellar Object |
| Right Ascension |
| Royal Aerospace Establishment |
| Rutherford-Appleton Laboratory |
| Royal Astronomical Society |
| Royal Astronomical Society of Canada |
| Reinforced Carbon-Carbon |
| Rodent Cage Interface |
| Reaction Control System / Revision Control System |
| Radiometric Calibration Target |
| Rat Enclosure Module |
| Remote Sensing Technology Center |
| Radio Frequency |
| Radio Frequency Interference |
| Reconfigurable Furnace Module |
| Red Fuming Nitric Acid |
| Red Giant |
| Red Giant Branch |
| Rotational Hand Controller |
| Research Institute for Advanced Computer Science |
| Rossiskoye Kosmicheskoye Agentsvo |
| Radaiation Monitoring Container Device |
| Radiation Monitoring Experiment |
| Remote Manipulator System |
| Revised New General Catalog |
| ROentgen Satellite |
| Rodents Of Unusual Size |
| Retro Propulsion Module |
| Radio SuperNova |
| Radioisotope Thermoelectric Generator |
| Return To Launch Site |
| Raketniye Voiska Stratigcheskovo Naznacheniya |
| Spiral (for galaxies) |
| SpaceCraft |
| South Atlantic Anomaly / Single Access Antenna |
| Solar Array Gain Augmentation |
| Shuttle Avionics Integration Laboratory |
| Shuttle Activation Monitor |
| Solar Anomalous and Magnetospheric Particle EXplorer |
| Space Acceleration Measurement System |
| Smithsonian Astrophysical Observatory |
| Search And Rescue / Synthetic Aperture Radar |
| Satellite pour Astronomie Radio Amateur |
| Search and Rescue Exercise / Shuttle Amateur Radio Experiment |
| Space Activity Suit / Space Adaptation Syndrome |
| Synthetic Aperture Telescope |
| Spiral, Barred (for galaxies) |
| Small Business Innovation Research |
| Shuttle Carrier Aircraft |
| Schmidt-Cassegrain Telescope |
| Strategic Defense Initiative |
| Strategic Defense Initiative Organization |
| Sloan Digital Sky Survey |
| Sustainer Engine Cutoff |
| Students for the Exploration and Development of Space |
| Space Exploration Initiative |
| Space Environment Monitor |
| Societe Europeenne de Propulsion |
| Space Experiments with Particle Accelerators |
| Swedish ESO Submillimeter Telescope |
| Search for ExtraTerrestrial Intelligence |
| Space Station Heat Pipe Advanced Radiator Element |
| Sudden Ionospheric Disturbance |
| Shuttle Imaging Radar |
| Space InfraRed Telescope Facility |
| Silicon X-ray Array |
| (Comet) Shoemaker-Levy / SpaceLab |
| Space Link Access Protocol |
| Side-Looking Airborne Radar |
| Space Launch Complex |
| Shuttle Landing Facility |
| SpaceLab Japan |
| Space(lab) Life Sciences |
| Small Magellanic Cloud |
| Solar Mesosphere Explorer |
| Small EXplorers |
| Solar Maximum Mission |
| Shuttle Mission Simulator |
| SuperNova |
| Sodruzhestva Nezabisimikh Gosudarst |
| Signal to Noise Ratio / SuperNova Remnant |
| Solar Neutrino Units |
| Strap-On Booster |
| Satellite Operations Control Center |
| Spray-on Foam Insulation |
| Stratospheric Observatory For Infrared Astronomy |
| SOlar Heliospheric Observatory |
| Solar Stellar Irradiance Comparison Experiment |
| Space Physics and Analysis Network |
| Shuttle Pointed Autonomous Research Tool for Astronomy |
| Space Pallet Satellite |
| Special Purpose Dextrous Manipulator |
| Smoothed-Particle Hydrodynamics |
| Systeme Probatoire pour l'Observation de la Terre |
| Solar Power Satellite |
| SPARTAN |
| Special Relativity |
| Solid Rocket Booster |
| Solid Rocket Motor |
| Shuttle Solar Backscatter Ultraviolet experiment |
| Solid Surface Combustion Experiment |
| Space Station Freedom |
| Solid-State Imager / Space Studies Institut |
| Space Shuttle Main Engine |
| Spurious Shut-off |
| Space Station Processing Facility |
| Space Shuttle Program Office |
| Sky Survey Prototype System |
| Space Station Remote Manipulator System |
| Single Stage Rocket Technology |
| Solar-Sail Race Vehicle |
| Spectroscopic Survey Telescope / SuperSonic Transport |
| Single Stage To Orbit |
| Star Calibration |
| Stennis Test Center |
| SHAPE Technical Center |
| Surface Tension Driven Convection Experment |
| Stick Scatterometer |
| Space Telescope Imaging Spectrometer |
| Shuttle Transport System / Space Transportation System |
| Space Telescope Science Institute |
| Space Telescope Science Data Analysis System |
| Solar Ultraviolet Spectral Irradiance Monitor |
| Solar Wind Anisotropy Experiment |
| Submillimeter Wave Astronomy Satellite |
| ShortWave Fading |
| Salt Water Leak Check |
| International Atomic Time |
| Transatlantic Abort Landing |
| Thousand Astronomical Unit |
| Trajectory Control Maneuver |
| Thermal Control System |
| Tracking and Data Relay Satellite |
| Tracking and Data Relay Satellite System |
| Terrestrial Dynamic Time |
| Torque Equilibrium Attitude |
| Thermal Emission Spectrometer |
| Temperature/Humidity Infrared Radiometer |
| Time of (until) Ignition |
| Television InfraRed Observation Satellite |
| Tsukuba Space Center |
| Thematic Mapper |
| Total Ozone Mapping Spectrometer |
| Ocean Topography Experiment |
| Toward Other Planetary Systems |
| Transfer Orbit Stage |
| Tank Pressure Control Experiment |
| Thermal Protection System |
| Tropical Rainfall Measuring Mission |
| Tail Service Mast |
| Tsentr Podgotovka Kosmonavti |
| Targeted Search System / Tethered Satellite System |
| Two Stage To Orbit |
| Tsentr Upravileniya Polyoti |
| Telemetry, Telecommand, and Control |
| Travelling Wave Tube Amplifier |
| Union pour la Promotion de la Propulsion Photonique |
| Upper Atmosphere Research Satellite |
| Unpressurized Berthing Mechanism |
| Unsymmetrical DiMethyl Hydrazine |
| Unidentified Flying Object |
| Uppsala General Catalog |
| Ultra High Frequency |
| Ultraviolet Imaging Telescope |
| United Kingdom Schmidt Telescope |
| University of Surrey Satellite |
| Union pour la Promotion de la Propulsion Photonique |
| Universities Space Automation/Robotics Consortium |
| United States Air Force |
| United States Marine Corps |
| United States Microgravity Laboratory |
| United States Microgravity Payload |
| United States Navy |
| Ultra-Stable Oscillator |
| Universal Time |
| Coordinated Universal Time |
| Ultraviolet |
| Ultraviolet Plume Instrument |
| Ultraviolet Spectrometer |
| Vehicle Assembly Building |
| Vandenberg Air Force Base |
| VISSR Atmospheric Sounder |
| Vernier Engine Cutoff |
| Venus-Earth-Earth Gravity Assist |
| Visual Function Tester |
| Very High Frequency |
| Vertical Integration Building |
| Graphics format used by JPL |
| Visible/Infrared Spin-Scan Radiometer |
| Very Large Array |
| Very Long Baseline Array |
| Very Long Baseline Interferometry |
| Very Low Frequency |
| Very Large Telescope |
| Voenno-Morskoy Flot |
| Vertical Motion Simulator |
| Venus Orbiting Imaging Radar |
| Vertical Processing Facility |
| Venus Radar Mapper |
| SNGVooruzhennikh Sil SNG |
| Vertical Takeoff Horizontal Landing |
| Vertical Takeoff Vertical Landing |
| Voenno-Vosdushniye Sili |
| White Dwarf |
| Wallops Flight Facility |
| Wide Field/Planetary Camera |
| Replacement for WFPC |
| Weakly Interacting Massive Particle |
| Wind Imaging Interferometer |
| Wisconsin/Indiana/Yale/NOAO telescope |
| World Meterological Organisation |
| Western Range |
| White Sands Ground Terminal |
| White Sands Missile Range |
| Western Test Range |
| Wisconsin Ultraviolet PhotoPolarimter Experiment |
| X-ray Multi Mirror |
| Extreme Ultraviolet |
| Yokohama Science Center |
| Young Stellar Object |
| Zeolite Crystal Growth |
| Zenith Hourly Rate |
