An astronaut is a person trained to travel and work in space, usually as part of a human spaceflight program on board a spacecraft or space station.

What “astronaut” means

  • The word comes from Greek roots meaning “star sailor,” combining “astron” (star) and “nautes” (sailor).
  • In everyday use, it means someone whose job is to go beyond Earth’s atmosphere, operate spacecraft, and often conduct scientific experiments in space.

How the term is used

  • In Western countries (like the United States, Canada, Europe, and Japan), human space travelers are usually called astronauts.
  • Russian space travelers are usually called cosmonauts , and Chinese crews are often called taikonauts , though “astronaut” can technically apply to all human space travelers.

A quick example

Imagine a person who trains for years to learn spacecraft systems, practices spacewalks underwater, and then flies to the International Space Station to run experiments in microgravity: that person is an astronaut.

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