NASA / SCIENCE PHOTO LIBRARY NASA / SCIENCE PHOTO LIBRARY
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X-15 aircraft. Footage showing an X-15 aircraft with external fuel tanks, launching with its Boeing B-52 mothership for a test flight. Developed by the US Air Force and NASA, the X-15 was a rocket-powered research aircraft designed to investigate flight at hypersonic speeds (greater than Mach 5). Three X-15s flew a total of 199 missions between 1959 and 1968. The X-15 was carried into the air by a converted B-52 bomber and released at high altitude. The pilot then ignited the aircraft's rocket motor. It was the first plane to reach the edge of outer space and set records for the fastest manned aircraft (7,274 kilometres per hour, or Mach 6.72).
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