Gravity is a force. It is the force that keeps our feet on the ground and the Earth spinning around the Sun.
On Earth it is easy to forget about Gravity, unless you fall out of a tree or try jumping high. It is the force of Gravity which makes you fall towards the ground.
All objects have gravity. The bigger the object, the stronger the gravity.
Our Sun is huge, many thousands of times bigger than Earth. Because it is so big it has very powerful Gravity. It is the Sun's Gravity that keeps the Earth and all the planets from flying off into space!
Challenge: Use the calculator to find out;
Which planet (or moon!) has more gravity than Earth.
Which planet has the least gravity?
On which planet is your weight about half that on Earth?
Last Updated: 22/03/2005