"The only real issue seems one of cost." But that is a real issue. A tiny ship is billions of dollars. A ship big enough to provide even half a G is more lik

"The only real issue seems one of cost." But that is a real issue. A tiny ship is billions of dollars. A ship big enough to provide even half a G is more like a trillion dollars. It can't simply be a tiny spinning wheel. It has to be dozens of meters across. Of course, trashing Iraq cost us over a trillion so far, and will likely exceed 2 trillion before all is done, but that's different.