**The universal law of gravitation :**

The universal law of ’gravitation states that every body in the universe attracts other body with a force which is directly proportional to the product of their masses and inversely proportional to the square of the distance between them.

**Explanation : **

Let two bodies of masses M and M be separated by a distance of ’d’. Then the force of gravitation between them

G is a proportionality constant, called universal gravitational constant.

The value of G = 6.67 × 10^{-11} Nm^{2}kg^{-2}