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oxygen × 77mars × 18
atmosphere × 13
spacesuits × 9
iss × 8
fuel × 7
life-support × 7
hydrogen × 7
crewed-spaceflight × 6
colonization × 5
apollo-program × 4
astronauts × 4
chemistry × 4
food × 4
pressure × 4
venus × 3
liquid-fuel × 3
materials × 3
water × 3
life × 3
astrobiology × 3
terraforming × 3
cryogenics × 3
humans × 3
environment × 3