Newton's Universal Law of Gravitation states that every point mass attracts every other point mass by a force acting along the line intersecting both points.

• The force ($F$) is directly proportional to the product of the masses ($m_1{m}_2$).
• It is inversely proportional to the square of the distance ($r$) between them. $F=G\frac{m_1{m}_2}{r^2}$ where $G\approx 6.674\times 10^{-11}\text{ N}\cdot {\text{m}}^2{\text{/kg}}^2$ is the gravitational constant.