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…showed last 75 words of 4760 total…which is 90 kilometers across, can be domed over with a cable reinforced membrane. One thing we must really concern ourselves with is the sterility of space. Conditions in a space-station with no life other than algae and humans would be very much like life in an Antarctic research station. A few lantern-jawed men and women of iron constitutions could probably stand it for awhile, but it would be no way to raise families. In t