great, the construction cost per unit mass will be assumed here reduced to $2xl06/t. The construction cost of equipment and supplies which remains to be accounted for will be assumed here to be $106/t. It will be assumed that the cost for research is the same as for the extended S.S.I. plan, and that the cost of salaries plus first receiver is twice as great, or $6x10$. Since automation is less advanced in this plan, the cost of computers is assumed to be zero instead of the $3x10$ assumed in the extended S.S.I. plan. Costs are Construction from Asteroidal Resources with Pure Self-Reproduction Assumptions The assumptions used in this plan follow. Most assumptions used in the construction of habitats will be given later. Equipment 1. The equipment used in this plan has the same characteristics as in the extended S.S.I. plan with pure self-reproduction. No men are required in space. 2. The use of two asteroids is discussed in detail. The mass of the first asteroid is 10$ t, and of the second 1012 t. Both are selected to contain all elements for pure self-reproduction, and therefore must be carbonaceous chondrites. The first is used to manufacture solar power satellites, and the second space habitats. The second must contain adequate C, N, H, P, and other elements required in the habitats. 3. Reaction mass for the trip of the mass driver reaction engine and space manufacturing facility from the first asteroid to the second is provided from waste produced during the production of the first copy of the space manufacturing facility, on the first asteroid. Reaction mass for the trip from low earth orbit to the first asteroid is provided by powdered shuttle external tanks. They are powdered by the same equipment used in the extended S.S.I. plans. 4. One-third of the mass of material from the asteroids can be used in a solar power satellite or as the structural mass of a habitat. 5. Enough copies of the space manufacturing facility will be produced that their control is only possible through artificial intelligence shared among computers in the space manufacturing facilities and on earth. It will be assumed that such an artificial
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