High Frontier

In the near future, nanofacturing techniques will allow incredible new materials to be built atom by atom. But they can only be built in the zero-gravity and high-vacuum conditions in space. Various private and government enterprises race to establish a buckytube mechanosynthesis factory on a suitable carbonaceous asteroid. To do so, they accumulate tanks of water in orbiting fuel depots, to be used as rocket propellant. Also needed are remote-controlled robonauts to do the grunt work. The key