AATT Advanced Air Transportation Technology
ACE Advanced Composition Explorer
ACRIM Active Cavity Radiometer Irradiance Monitor
AEPA Atmospheric Effects of Aviation program
AGATE Advanced General Aviation Transport Experiments
ALT-Laser Laser Altimeter
AST Advanced Subsonic Technology
ASTP Advanced Space Technology program
Astrobiology The study of the living universe. Provides a foundation for a multidisciplinary study of the origin and distribution of life in the universe, including the role of physical forces, planetary atmospheres, and ecosystem interaction in the evolution with living systems.
Astromaterials The natural, nonbiological materials that constitute the solid bodies of the solar system other than Earth, including planets, satellites, asteroids, comets, and dust. These materials may be studied in situ in their place of origin, collected by missions for return to Earth, or brought to Earth by natural phenomena (meteorites, cosmic dust).
ASTT Aeronautics and Space Transportation Technology (Enterprise)
AXAF Advanced X-ray Astrophysics Facility
CGRO Compton Gamma Ray Observatory
DoD Department of Defense
DOE Department of Energy
El Niño A climate disturbance occurring every 2 to 5 years in the Pacific Ocean. A region of warm water forms in the western Pacific and moves toward South America, altering weather and rainfall patterns, wind directions, and even the jet stream. El Niño events contribute to floods and droughts in the Americas, Africa, and Australia.
EOCAP Earth Observation Commercialization Applications program
EOS Earth Observing System
EOSDIS EOS Data and Information System
ERAST Environmental Research Aircraft Sensor Technology
FAA Federal Aviation Administration
FIRST Far-Infrared Space Telescope
GAP General Aviation Propulsion program
GLAST Gamma-ray Large Area Space Telescope
Global change The full range of natural and human-induced changes in Earth's environment, including alterations in climate, land productivity, oceans or other water resources, atmospheric chemistry, and ecological systems, that may alter the capacity of Earth to sustain life.
GOES Geostationary Operational Environmental Satellite
GPRA Government Performance and Results Act of 1993
GRACE Gravity Recovery and Climate Experiment
HEDS Human Exploration and Development of Space (Enterprise)
HPCC High Performance Computing and Communications
HSR High-Speed Research
HST Hubble Space Telescope
HTXS High Throughput X-ray Spectroscopy mission
Human-rated General term that can best be described as designing piloted vehicle systems in such a manner as to safely accommodate humans and to make use of human-inherent capabilities to ensure the greatest possible probability of a successful mission.
IMAGE Imager for Magnetopause-to-Aurora Global Exploration
IPCC International Panel on Climate Change
ISS International Space Station
LEO Low-Earth orbit
Microgravity research Area of scientific application and commercial research concerned with the identification and description of the effects of reduced gravitational forces on physical and chemical phenomena. Microgravity research probes a new parameter in space where gravitional acceleration no longer is equal to 1 g and, instead, can approach values that are orders of magnitude lower.
Mir Russian space station
MTPE Mission to Planet Earth (Enterprise)
NEAR Near Earth Asteroid Rendezvous
NGST Next Generation Space Telescope
NMP New Millennium program
NOAA National Oceanic and Atmospheric Administration
NPOESS National Polar-orbiting Operational Environmental Satellite System
NPR National Performance Review
PFP President's Financial Plan
R&D Research and development
R&T Research and technology
ReCAT Reduced Cost of Air Travel
SAGE Stratospheric Aerosol and Gas Experiment
SAMPEX Solar, Anomalous, and Magnetospheric Particle Explorer
SeaWiFS Sea-viewing Wide Field-of-view Sensor
SIM Space Interferometry Mission
SIRTF Space Infrared Telescope Facility
SOFIA Stratospheric Observatory for Infrared Astronomy
SOHO Solar and Heliospheric Observatory
Space Act National Aeronautics and Space Act of 1958
SRTM Shuttle Radar Topography Mission
SSE Space Science Enterprise
SSTI Small Spacecraft Technology Initiatives
TAP Terminal Area Productivity
TIMED Thermosphere-Ionosphere-Mesosphere Energetics and Dynamics
TOMS Total Ozone Mapping Spectrometer
TRMM Tropical Rainfall Measuring Mission
USGS U.S. Geological Survey
USMP U.S. Microgravity Payload
VCL Vegetation Canopy Lidar Mission
WMO World Meteorological Organization

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