The Aviationist on MSN

Going hypersonic: A look at the record-setting X-15

An important part of data collection for the United States space program, the North American X-15 had astonishing performance ...
Dark Space Official on MSN

X-15: The rocket plane that quietly reached space

The X-15 program pushed human flight into hypersonic speeds and the edge of space long before the Space Shuttle, with pilots ...