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water × 125mars × 45
planetary-science × 12
atmosphere × 11
the-moon × 10
mining × 8
iss × 7
space-station × 6
microgravity × 6
life × 6
launch × 5
colonization × 5
terraforming × 5
launchpad × 5
geology × 5
ice × 5
crewed-spaceflight × 4
launch-site × 4
isru × 4
spacex × 3
rockets × 3
nasa × 3
spacesuits × 3
radiation × 3
astrobiology × 3