gravity

One of the four fundamental forces in the universe that affect all matter. It is the weakest of these four forces, and it is an attractive force. The magnitude of gravitational attraction depends directly on the mass of the two objects being attracted and inversely on the square of the distance between them. For instance, the gravitational attraction between a person and the Earth is much greater than that between a person and the Sun. Even though the Sun is 330,000 times more massive than the Earth, it is about 100 million times farther away than the Earth. This distance weakens the gravitational attraction between the person and the Sun, so that the Earth's gravitational pull on a person at Earth's surface is 1653 times greater than the Sun's.