its mass per year. The statement of S.S.I. that the space manufacturing facility with 128 copies has throughput 3x10^ t/yr. is therefore false; the actual number of space manufacturing facility copies required is It will be assumed that the correct number of copies is 259. This requires slightly more than 8 generations, since 2$ = 256, and it will be assumed the remaining space manufacturing facilities are completed one month after the 8th generation. 31. 60 tons of lunar soil input to the lunar manufacturing facility is needed to produce a new 25 t copy in 3 months [35], Since the mass from earth is 10% of this mass, 0.9 • 25 t = 22.5 t of the mass used in the final product is from the moon. Thus at least 1/3 of the mass of lunar soil input to the space manufacturing facility is used in its copies. This fraction is less in space manufacturing facility self reproduction. The masses of Si, Al, and Fe produced from 60 t of lunar soil are 12 t, 8 t, and 3 t respectively, [36] all of which can be used in a solar power satellite, so the ratio of throughput to mass which can be used in a solar power satellite is Since the throughput of the space manufacturing facility is 3x10^ t/yr. when 259 space manufacturing facilities are complete, the rate of use of lunar soil in final product is which is greater than the 10^ t mass of a solar power satellite. Thus it will be assumed the completed space manufacturing facility of this plan can construct one solar power satellite per year, and that during solar power satellite construction, 1/3 of the mass input to the space manufacturing facility is used in solar power satellites. Since the throughput of the space manufacturing facility is 3xl05 t/yr. with 259 copies, this yields the construction of 105 t/yr., which is the mass of one solar power satellite per year. 32. The completed manufacturing facilities are flexible enough to manufacture anything required for solar power satellite or large mass driver reaction engine
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