NASA - National Aeronautics and Space Administration

Exhaust comes out of the space shuttle Discovery as it launches into space. Image Credit: NASA

      hot gases released from a rocket motor or engine

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Sentences:
The space shuttle gives off big exhaust clouds during its launch.

Exhaust from cars and airplanes can cause pollution.

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More Information:
http://www.nasa.gov/images/content/190851main_launchinsmoke-web.jpg