An astronaut is a person who travels into space! Astronauts explore, do science experiments, and learn about the universe. They are trained to live and work far from Earth for weeks or even months at a time.
- The word “astronaut” means “star sailor” in Greek.
- More than 600 people have traveled to space so far.
- Astronauts grow about two inches taller in space because gravity is not squishing their spine!
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