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- Algae
- Algonquin Radio Observatory
- Alumina
- Aluminum
- Amazonis quadrangle
- Amenthes quadrangle
- Amino acids
- Ammonia
- Analog Station
- Animals
- Aphelion
- Apoapsis
- Apoareion
- Apogee
- Apollinaris Mons
- Apsis
- Aquaculture
- Arabia quadrangle
- Arcadia quadrangle
- Arch segments
- 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
- Atmospheric loss
- Atmospheric processing
- Atomic battery
- Automation
- Autonomous planetary settlement
- BFR
- Back contamination
- Bacteria
- Bacteria Colonists
- Baikonur Cosmodrome