Flight 35 of the North American X-15 was a test flight conducted by NASA and the US Air Force on March 30, 1961.
[1] The X-15 was piloted by Joseph A. Walker to an altitude of 169,600 feet (51.7 km; 32.12 mi) surpassing the stratopause.
[3] This human altitude record lasted about two weeks, until Yuri Gagarin became the first man in space on Vostok 1 on April 12, 1961.
The flight landed at Edwards Air Force Base.
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