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- American Institute of Aeronautics and Astronautics
- Americium
- Amsat
- Anorthite
- Anorthosite
- Antimony
- Ants
- Apollo
- Apollo 1
- Apollo 11
- Apollo 5
- Apollo Subsatellite
- Architecture as Mole Hills
- Architecture as Tent City
- Architecture in Field Stone
- Area of Regions on the Lunar Sphere
- Argon
- Aristarchus Plateau
- Arithmetic Mean
- Arsenic