"We'll learn. We'll try again. That's what it takes," said Regina Dugan, director of the Defense Advanced Research Projects Agency (DARPA), which ran both tests.
Second Spaceplane flight failure raises questions on future →
"It gives us a visceral feel for what it means to fly at Mach 20," DARPA Director Regina Dugan said in a statement.
Agency releases video of hypersonic glider flight →