Newton’s Law Of Universal Gravitation states that every particle in the Universe attracts every other particle with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between them.

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

, where:

- F is magnitude of the gravitational force between the two point masses,
- G is the gravitational constant,
*m*_{1}is the mass of the first point mass,*m*_{2}is the mass of the second point mass,*r*is the distance between the two point masses.

The gravitational force is inversely proportional to the square of the separation of the particles.

$F \propto \frac{1}{r^{2}}$

*** Only applicable to point masses **