Earth Abbreviations and Acronyms
- ARLAir Resources Laboratory, Silver Spring, Maryland
- ARMAsteroid Redirectwmission
- ARMSATAtmospheric Radiation Measurement Satellite
- ARPSAngular Rotation of Particle Spin
- ASArtificial Satellite
- ASBArea of Savanna Burned Annually
- ASCATAdvanced Scatterometer
- ASCATTAdvanced Scatterometer
- ASCEAmerican Society of Chemical Engineers
- ASCENDAgenda of Science for Environment and Development Into The 21St Century
- ASCHEAmerican Society of Chemical Engineers
- ASEAMSAssociation of Southeast Asian Marine Scientists
- ASMAbsolute Scalar Magnemometer
- ATDLAtmospheric Turbulence and Diffusion Laboratory
- ATLANTISResearch Vessel
- ATLASTAdvanced Technology Large Aperture Space Telescope
- ATPEXArm Tropical Pacific Experiment
- AUAstronomical Unit
- AUAstronomical Units
- AUSAstronomical Units
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