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X-15 flight 90 accidentally pushed a pilot past the edge of space

The North American X-15 was built to flirt with the edge of space, not to cross it by accident. Yet on a research mission labeled Flight 90, a routine test profile slipped just far enough out of ...
The Aviationist

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 ...