An astronaut or cosmonaut is a person trained by a human spaceflight program to command, pilot, or serve as a crew member of a spacecraft.
While generally reserved for professional space travelers, the terms are sometimes applied to anyone who travels into space, including scientists, politicians, journalists, and tourists.
Starting in the 1950s up until 2002, astronauts were sponsored and trained exclusively by governments, either by the military or by civilian space agencies. With the sub-orbi...
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