Last month marked the 65th anniversary of the arrival of the X-15 hypersonic spaceplane, which was developed as a joint project among NASA, the United States Air Force, and U.S. Navy. On October 15, ...
The flight's four crewmembers represent four different space agencies. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. SpaceX's next astronaut ...
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