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They suggest that a lot could come from the moon. This page has the rough breakdown of where each part would come from https://www.canva.com/design/DAGmr3ubC8E/

• m4rtink 1y ago
  Yeah, no way space projects this size are built from materials lifted from earths gravity well. Like, you could probably do it as an achievement with launch loops[0] or an space elevator[1]. But it makes no sense if you have material ready to use just flaoting in space (asteroids) or in a much more shallow gravity well (Lunar stuff can be easily launched to orbit via mass drivers). [0] https://en.wikipedia.org/wiki/Launch_loop https://en.wikipedia.org/wiki/Launch_loop [1] https://en.wikipedia.org/wiki/Space_elevator https://en.wikipedia.org/wiki/Space_elevator