"Designed by the military research group DARPA (Defense Advanced Research Projects Agency), the triangular wedge of zoom is capable of reaching Mach 20, which is approximately 13,000 miles per hour, according to the agency. At such a speed, the aircraft will be subject to temperatures in excess of 3,500 degrees Fahrenheit."
"This is the second run for the hypersonic vehicle. A first test in April 2010 ended with the HTV-2 crashing into the Pacific after a loss of contact nine minutes into the flight."