The mass which requires research is 0.14 • 232 t = 32.5 t. Asteroidal Resources with Pure Self-Reproduction and Construction in Low Earth Orbit Scheduling This plan follows the plan for construction from asteroidal resources with pure self-reproduction with modifications corresponding to those made for the extended S.S.I. plan with pure self-reproduction and construction in low earth orbit. Only the space manufacturing facility is carried to low earth orbit by the space shuttle, along with the raw material required to construct the mass driver reaction engine and external tank powderer. 2/3 of the 174 t mass of the mass driver reaction engine is constructed from the aluminum of shuttle external tanks, but since the powderer is required before use can be made of these tanks, all of its 25 t mass is brought to orbit as shuttle payload in the form of raw material. The total mass of raw material brought as payload to low earth orbit b~ the space shuttle is therefore The objects brought to low earth orbit by the shuttle as payload are then are required for this purpose. The 1411 of shuttle payload requires Since 30 t of each external tank is aluminum, and 2/3 • 174 t = 116 t of aluminum from this source is used in mass driver reaction engine construction,
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