Prime objective of this article is represent on Extraterrestrial Materials. Gerard O’Neill, noting the issue of high launch costs in the early 1970s, proposed building the SPS’s in orbit with materials in the Moon. Launch costs in the Moon are regarding 100 times under from Earth, as a result of lower gravity. That 1970s proposal assumed the then-advertised upcoming launch costing involving NASA’s space taxi.
Extraterrestrial Materials
