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Flight 90 and the X-15, how a small test deviation turned a research plane into America’s first civilian spaceflight

In 1963, a routine X-15 test flight climbed just a little higher than planned, carrying pilot Joseph Walker beyond the Kármán Line and into space. This is the precise chain of decisions, physics, and ...
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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 utilizing the technology of the 1950s and 60s. The North American X-15 was ...