The X-15 was made by North America and was destined to be a plane that makes its pilots cross the borders of being plane pilots to astronauts, because it can easily gone beyond the 50 mile-height. It’s top speed of 4,520 miles per hour or Mach 6.7. It was perfect for space training also this plane was used by the famous astronaut, Neil Armstrong, before he went on the mission for the moon.
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