Well, I think giant habitats at L4/L5, made from metal and glass shipped from the lunar surface or the asteroids (as envisioned by O’Neill), might be a better u

Well, I think giant habitats at L4/L5, made from metal and glass shipped from the lunar surface or the asteroids (as envisioned by O’Neill), might be a better use of that capacity than cities on Mars, but whatever, as long as we get out there. https://en.wikipedia.org/wiki/O%27Neill_cylinder https://en.wikipedia.org/wiki/O%27Neill_cylinder