NASA - National Aeronautics and Space Administration

Astronaut Michael Foale finds juggling fruit is easy without Earth's gravity pulling it down. Image Credit: NASA

      the force by which a planet or other body tends to draw objects toward its center

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Sentences:
The force of gravity keeps all of the planets in orbit around the sun.

It would be fun to play basketball on the moon where there is less gravity.

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More Information:
http://apod.nasa.gov/apod/ap011113.html   →
http://helios.gsfc.nasa.gov/qa_sp_gr.html#micrograv   →
http://starchild.gsfc.nasa.gov/docs/StarChild/questions/question30.html   →