how does the sun keep the planets in orbit?

Have you ever wondered how the planets revolve around the sun? Have you ever wondered why? Well the answer seems simple. Gravity. Gravity is the most mysterious force in the universe, scientists say, and the most misunderstood. And yet, if it were not for gravity, the planets would go flying away from the sun like nine billiard bills. In fact, if gravity did not exist, neither would planets. Gravity, the attraction of matter to other matter, is what binds them together into spherical balls to begin with.

The gravity of the sun is strong enough to keep nine planets, dozens ...