​​What's the difference between an Astronaut and a Cosmonaut?

The distinction is that they are titles awarded by different space agencies. They both mean essentially the same thing and they both come from Greek. Cosmonaut  is used by the Russian Space Agency. Astronaut is used by NASA, ESA, CSA, and JAXA.

An  astronaut or cosmonaut (Russian) is a person trained by a human spaceflight program to command, pilot, or serve as a crew member of a spacecraft.

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