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Old 04-02-2012, 05:58 PM   #5
Penforhire
Wizard
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Posts: 2,230
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Join Date: Nov 2007
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I think the biggest issue is how unfriendly the environment of space is to human life. That issue is similar to deep underwater cities, which seem easier to create. Space is just such an unforgiving environment and much (most?) of our SF seems to gloss over that. Pinhole? Death. Runaway bacteria? Death. Almost any ecological unbalancing = death. Earth has amazing resiliency in its terrestrial ecosystem.
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