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- Archaea
- Areomorphology
- Areostationary orbit
- Ares Vallis
- Argon
- Argyre quadrangle
- Ariane
- Arsia Mons
- Artificial cave
- Artificial intelligence, automated industry and colonizing Mars
- Ascraeus Mons
- Aspirin
- Assembly
- Association Planète Mars
- Asteroids
- Astrobiology
- Astronautics
- Astronomical Unit
- Atlas V
- Atmosphere