• Commented on What else can you do with a Big Dumb Booster?
    A lunar colony could build aluminum-oxygen rockets. The propellant is not as good as the usual stuff but it can be made out of moon rocks. Combined with your idea of using a lunar space elevator, which skips the worst...
  • Commented on Evolver
    I'd expect offshoots of another species to develop industrial civilization within 10MY and derail any further predictions. My top candidates are crows, parrots, hornbills, apes again, or the mimic octopus. That list is chosen entirely on a fuzzy idea of...
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