Sir Newton's Law of Gravitation

What is a Newton's law of universal gravitation?

Law 8   Every particle in the universe attracts every other particle with a force that is proportional to the product of their masses (and therefore proportional to the product of their masses) and inversely proportional to the square of the distances between them. This force acts along a straight line joining the two particles.

In Newton's law of universal gravitation, $F$ is the force in Newtons (N), $G$ is the universal gravitation constant ( $N\cdot m^{2}/kg^{2}$), $m_{1}$ and $m_{2}$ are the masses of the two orbiting objects in kilograms (kg), and $r^{2}$ is the distance between the two objects in meters (m):

$$F = G\frac{m_{1}m_{2}}{r^{2}}$$ (62.3)