XS-1: DARPA's Experimental Spaceplane
• https://www.space.com, By Elizabeth HowellThe XS-1 is a space plane under development by the U.S. military's high-tech agency, the Defense Advanced Research Projects Agency (DARPA).
The XS-1 is a space plane under development by the U.S. military's high-tech agency, the Defense Advanced Research Projects Agency (DARPA).