• Consider CVD production of large optics using the free vacuum in space. This could, perhaps, be part of a solar dynamic generator production demonstration. • Demonstrate the ability to produce parts useful for the construction of large structures in space. Perhaps foamed metal beam manufacture could be demonstrated. This would potentially extend the length of a beam which can be produced from a given mass of metal, providing less massive structures and lowering launch requirements. This can be done with ingots of Al or Fe from Earth, or it could be coupled with the next milestone to recycle external tanks. • Demonstrate “cannibalization” of an external tank on-orbit. Perhaps use the metal in the production of beams as per above. • Consider the manufacture of an integrated solar panel on-orbit, using microgravity- enabled thin film substrate manufacturing, structural beam production, and thin film photovoltaic deposition (perhaps with terrestrial semiconductor material) using the space environment to advantage. Can this be provided to a Spacecraft? • Demonstrate the extraction of metal(s) from the waste material of oxygen production, first in the laboratory, then at a lunar outpost. • Demonstrate glass fabrication technology from lunar regolith. Since this is a physical processing method only, it should be fairly simple. Use this to provide low tech material for a lunar outpost, such as thermal blankets, sun shades, blast protection walls, foundations for structures, etc. • Develop lunar metal-based manufacturing capabilities once lunar chemical processing has proven to be feasible. At first, this can help maintain the outpost. Later, it can provide refined material to a Solar power satellite manufacturing site.
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