This 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, manoeuvrable aircraft that will glide through the Earth’s atmosphere at incredibly fast speeds, Mach 20 (approximately 13,000 miles per hour)
Picture: AP/DARPA
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