Add Yahoo as a preferred source to see more of our stories on Google. In a step that could bolster the U.S.'s hypersonic weapons push, the Pentagon on Monday confirmed the second successful test of a ...
Hypersonic plane startup, Hermeus, plans to make a plane faster than the SR-71 blackbird spy plane. the SR-71 could reach mach 3.3 and fly at 85000 to 100,000 feet in altitude. Quarterhorse Mk 2 will ...
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