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Gravity
 
An astronaut smiles as two grapefruit float in front of him

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



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.



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   →