Our Solar System's planets revolve around the Sun at different speeds. Isaac Newton predicted that the closer something is to the center of gravity, the faster it revolves around that center of gravity. So the planet's closer to the Sun revolve more quickly than planets that are farther away from the Sun. To learn more about Isaac Newton and other historical people's theories, formulae, etc., please click here. To learn more about the planets click here.

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Mercury Your age is	Venus Your age is	Earth Your age is	Mars Your age is
Jupiter Your age is	Saturn Your age is	Uranus Your age is	Neptune Your age is	Pluto Your age is