Morning Overview on MSN

The U.S. hypersonic jet that outran a bullet and changed space race

North American Aviation’s X-15 rocket plane reached 4,520 mph and climbed to 354,200 feet during a program that ran from 1959 ...
Modern Engineering Marvels on MSN

Mach 9.6 still matters: X-43A proved hypersonic flight can’t be simulated away

The set of problems that have never had a “just run it in the tunnel” has never had a hypersonics set. What X-43A has brought with it forever is that it made reality confront an engineering problem ...