For nearly three years now, we’ve been following the saga of the XS-1 Spaceplane — the Defense Advanced Research Projects Agency’s (DARPA) project to build a new and improved, 21st-century space shuttle.
For nearly three years now, we’ve been following the saga of the XS-1 Spaceplane — the Defense Advanced Research Projects Agency’s (DARPA) project to build a new and improved, 21st-century space shuttle.