The ecological complex in extraterrestrial bases.
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An examination of an earth-style ecological complex for comparison with other kinds of life-support systems that might be used in early extraterrestrial bases. After detailing some of the problems in reproducing the earth environment, the author discusses three general classes of regenerative life-support systems--physicochemical, algal, and hydroponic--and weighs their advantages. The paper concludes that the first extraterrestrial bases will probably depend on physiocochemical recovery of oxygen and water and on imported food supplies, whereas later versions might bring in algae or hydroponics on a small scale. Ultimately, hydroponics could become the mainstay of the ecological complex in lunar or Martian bases. 8 pp.
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