> If these are built on water, a distance from land, it should be possible to construct a nearby floating rectenna to crack and cryocool hydrogen and oxygen for

> If these are built on water, a distance from land, it should be possible to construct a nearby floating rectenna to crack and cryocool hydrogen and oxygen for propellant via beamed energy from a solar sat. That's such an enormous undertaking that it dwarfs the rockets themselves. SpaceX, which is the only company that's even close to achieving this, prefers kerolox. So what threat are we trying to mitigate? Liquid oxygen is not very problematic. We transport large amounts of the stuff on roads with no issue. Kerosene is used everywhere.