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It could reach a top speed of 4,520 miles per hour (7,274 km/h), or Mach 6.72. During the X-15 program, 13 flights by eight pilots met the Air Force spaceflight criterion by exceeding the altitude of 50 miles (80 km), thus qualifying these pilots as being astronauts.
Recent months, for instance, brought news that students in Germany have broken the record for the fastest accelerating electric car, and that the US Air Force plans to develop hypersonic jets that would travel at more than five times the speed of sound â thatâs speeds in excess of 3,790mph (6,100km/h).