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life × 94astrobiology × 22
mars × 17
atmosphere × 8
microgravity × 7
iss × 6
the-moon × 5
astronauts × 5
water × 5
colonization × 4
research × 4
humans × 4
medical × 4
exoplanet × 4
experiment × 4
animals × 4
radiation × 3
terraforming × 3
earth × 3
solar-system × 3
life-support × 3
chemistry × 3
europa × 3
forward-contamination × 3
sterilization × 3
