All planets have gravity. This is the force of the planet that pulls you to it. It is what holds everything on a planet. Gravity is different from one planet to the next. It is stronger on some and weak on others. In places where there is no gravity, things float!

Think about it:  Gravity affects how much you weigh. Would you weigh less or more on the moon than on Earth? Why?

To learn more about gravity, visit this site:  http://library.thinkquest.org/27585/