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oxygen × 81mars × 18
atmosphere × 14
spacesuits × 9
iss × 8
fuel × 7
life-support × 7
hydrogen × 7
crewed-spaceflight × 6
apollo-program × 5
colonization × 5
pressure × 5
astronauts × 4
chemistry × 4
food × 4
venus × 3
liquid-fuel × 3
materials × 3
water × 3
life × 3
astrobiology × 3
terraforming × 3
temperature × 3
cryogenics × 3
humans × 3