DARPA Experimental Spaceplane XS-1
Northrop Grumman Corporation with Scaled Composites and Virgin Galactic is developing a preliminary design for DARPAs Experimental Spaceplane XS-1, shown here in an artists concept. In addition to low-cost launch, the XS-1 will serve as a test-bed for a new generation of hypersonic aircraft. (Northrop Grumman Image)
