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In this undated artist's rendition released by the Defense Advanced Research Projects Agency (DARPA) showing 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 is scheduled for launch atop a Minotaur rocket on Wednesday Aug.10,2011 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)

Associated Press
In this undated artist's rendition released by the Defense Advanced Research Projects Agency (DARPA) showing 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 is scheduled for launch atop a Minotaur rocket on Wednesday Aug.10,2011 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)
In this undated artist's rendition released by the Defense Advanced Research Projects Agency (DARPA) showing 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 is scheduled for launch atop a Minotaur rocket on Wednesday Aug.10,2011 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)
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