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You're probably familiar with supersonic planes like the SR-71 Blackbird pictured above, which managed to fly at over three times the speed of sound, but imagine this: NASA set aside $15 million to develop a hypersonic plane that could exit our atmosphere at speeds between Mach 5 and Mach 20. The U

4 years ago 0 Comments
November 8, 2010 at 4:46AM