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The only way you could keep human biota 100% contained is if the humans never interacted with anything outside the welded-shut steel sphere they inhabited - in

• Symmetry 11y ago
  Well, shorter times delays on teleop are a useful thing. Humans can do that just as well from orbit but if you've gone all that way then the gravity on Mars might be enough of a health benefit to make it worth while landing.
• ethbro 11y ago
  The view across part of Valles Marineris?