Scientists are working on a 22,000-mile space elevator, a cable stretching from Earth to space. This 'sky ladder' could ...

Imagine taking an elevator to space. Or blasting off in a nuclear rocket. That might sound like science fiction, but scientists are racing to develop new, more efficient methods of space travel ...

is still about five times as expensive as the higher cost estimates for space elevators. There are other benefits besides cost, too. There's no danger of a rocket exploding, and the climbers could ...

With a space elevator, the cost is a fraction of that—it may go down to 100th or 1,000th of current costs—and there are no rocket engines that might explode." "You'd go to an ocean platform ...