NASA - National Aeronautics and Space Administration

The crew of the U.S.S. Iwo Jima lifts the Apollo 13 capsule to the deck. Image Credit: NASA

      a part of a spacecraft that can hold a crew and instruments

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Sentences:
Three astronauts sat in the Apollo capsule as their rocket launched them toward the moon.

Only two astronauts fit in a Gemini capsule.

Only one astronaut fit in a Mercury capsule.

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More Information:
http://www.nasa.gov/audience/forstudents/k-4/stories/what-was-apollo-program-k4.html
http://www.nasa.gov/audience/foreducators/rocketry/home/what-is-a-rocket-k4.html