The SPS based on Lunar material was analyzed by 2 U. S. industrial firms in the mid 70's who came to the conclusion that 90-96% of the materials needed for a SPS in GEO could come from the Moon. However, this would require a substantial lunar base construction and the use of mass drivers to send the lunar derived materials to a Space Manufacturing Facility. The figure contrasts the normal SPS concept with two Lunar-Derived scenarios. See Maryinak and O'Niell (1993).
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