metal or ceramic foam

>
> > Would it be possible to do what Jay suggests if not in zero gravity,
> > perhaps in low gravity (i.e. the Moon)? Perhaps that would remove
> > your
> > major issue with his ideas.
>
> That is the crux of the problem. If production has to be in a gravity
> well or a centrifuge well, energy must be used to get the material in
> and out of the well.

That makes sense, although it seems like the energy to escape the gravity
well of the Moon might still be worthwhile when compared to the energy
required to escape the Earth's gravity well, plus you still gain the
benefit of Jay's atmosphere-less manufacturing ability. I'd have to see
numbers.

But if you wanted to avoid gravity wells entirely, would rotational
artifical gravity suffice? Or is that just the stuff of science fiction?

Cheers,
--Justin