conditions of controlled atmosphere and abundant solar energy, with human intervention (as is customary in agriculture on earth), as necessary, to maintain stability. 8) A balanced set of design studies of earth-to-low- orbit vehicle systems, emphasizing: a) Minimum development cost, b) Minimum cost per pound of payload, c) Minimum adverse effect on the biosphere, but with less emphasis on massive single payloads. For example, shuttle-derivative freight rockets of moderate size, and single-stage-to-orbit fully-reusable vehicles of moderate size, would receive greater attention if this recommendation were followed. 9) A continued moratorium on the development of nuclear rockets. If our calculations are correct, the availability of liquid oxygen for refueling in high orbit, as a result of the processing of lunar materials, would give to ordinary chemical rockets a higher performance than could be achieved by nuclear stages, and with the risk of adverse public reaction. 10) Study of space-stations larger than a human-rated LDEF: facilities whose components could be launched by the shuttle or by a shuttle-derived freight rocket, and which when assembled would be suitable as construction and maintenance shops for larger objects. In my opinion the emphasis in these spacestation studies should be on productive work, not on physiology, because I see no reason why the purely physiological questions
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