The US Department of Defense's innovations arm, known as DARPA, has released test-flight video of its experimental hypersonic aircraft travelling at a speed of Mach 20, about 13,000 miles per hour.
The US Department of Defense's innovations arm, known as DARPA, has released test-flight video of its experimental hypersonic aircraft travelling at a speed of Mach 20, about 13,000 miles per hour.
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Reuters
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