The X-15 was an experimental Air Force rocket plane for the edge of space
In October 1967, test pilot and soon-to-be astronaut William J. Knight was flying at an altitude of more than 102,000 feet when he accelerated his aircraft to Mach 6.7. That…
In October 1967, test pilot and soon-to-be astronaut William J. Knight was flying at an altitude of more than 102,000 feet when he accelerated his aircraft to Mach 6.7. That…