Slowly but surely, DARPA’s XS-1 Experimental Spaceplane is becoming more than a bundle of nice ideas. The agency has just chosen the companies that will square off in the first phase of the unmanned craft’s design program, most of which are…
Slowly but surely, DARPA’s XS-1 Experimental Spaceplane is becoming more than a bundle of nice ideas. The agency has just chosen the companies that will square off in the first phase of the unmanned craft’s design program, most of which are…