Newton's Universal Law of Gravitation
Newton’s Universal Law of Gravitation is the force of gravity between two objects. The equation F=G(M1M2/d2) means that every mass attracts every other mass. This explains Kepler’s laws of planetary motion, that described the simple and stable orbits of the planets. It also means that the strength of the force of gravity attracting any two objects is directly proportional. This equation follows the inverse square law which states that any quantity that decreases with the square of the distance between two objects.