On Aug. 22, 1963, Joe Walker, a test pilot from NASA, flew the X-15 to its peak altitude of 354,200 feet, 67.08 miles above the Earth’s surface at Edwards Air Force Base, California (U.S. Air Force)
On Aug. 22, 1963, Joe Walker, a test pilot from NASA, flew the X-15 to its peak altitude of 354,200 feet, 67 miles above the Earth’s surface at Edwards Air Force Base, Calif. (Courtesy photo)