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agriculture aluminum asteroids astronauts astronomers atmosphere beam billion booster bucket build built carbon carbonaceous chondrites century colonists colony's construction shack cosmic rays cost courtesy Don Dixon Courtesy NASA diameter Don Dixon Earth Earthside electricity electrons energy engines Eric Drexler feet flight fusion Gerard O'Neill gravity grow heat hydrogen Keith Henson land laser launch vehicle living lunar base lunar material lunar soil magnetic major Mars mass-driver metals meteoroid microwave miles mirrors missions moon motor NASA nuclear O'Neill orbit oxygen panels particles payload pellet percent planets population pounds power satellites powersats problem produce propellant propulsion radiation radio telescopes rectenna rock rocket rotating shield Skylab solar solar furnace space colony space farm space shuttle space station spacecraft Stanford torus star star probes starship sunlight surface tank temperature tion tons transport tube velocity zero g