This undated artist's rendition released by the Defense Advanced Research Projects Agency (DARPA) shows the Falcon Hypersonic Technology Vehicle 2 (HTV-2). The Falcon HTV-2 is an unmanned, rocket-launched, maneuverable aircraft that glides through the Earth’s atmosphere at incredibly fast speeds, Mach 20 (approximately 13,000 miles per hour). The hypersonic glider was launched early Thursday, Aug. 11, 2011, but contact was lost after it began flying on its own, authorities said. It was launched from Vandenberg Air Force Base, Calif. The Hypersonic Test Vehicle-2 is an experiment in extremely high speed flight technologies by the U.S. Defense Advanced Research Projects Agency. (AP Photo/DARPA)
Read the article: Contact lost with drone hypersonic glider after launch
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