NASA - National Aeronautics and Space Administration

Astronaut Barbara Morgan is a NASA mission specialist and NASA's first Educator Astronaut. Image Credit: NASA

      a person trained to travel and work in space

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Sentences:
An astronaut goes through a lot of training on Earth before going into space.

In Greek, astro means star and naut means sailor. An astronaut is someone who sails among the stars.

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More Information:
http://www.nasa.gov/astronauts
http://www.nasa.gov/worldbook/wbkids/k_astronaut.html