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physical-activity × 17gravity × 5
colonization × 5
reduced-gravity-sports × 5
iss × 4
mars × 3
the-moon × 3
humans × 3
crewed-spaceflight × 2
medical × 2
nasa × 1
space-shuttle × 1
attitude × 1
radiation × 1
interstellar-travel × 1
space-station × 1
microgravity × 1
lunar-landing × 1
health × 1
water × 1
astronaut-lifestyle × 1
esa × 1
training × 1
moonwalking × 1
policy × 1