Gravitational force is a attractive force between two masses m₁ and m₂ separated by a distance r. The gravitational force acting between two point objects is proportional to the product of their masses and inversely proportional to the square of the distance between them.

Gravitational force.  F= Gm₁ m₂r

                                                                r

Where G is universal gravitational constant.

The value of G is 6.67 X 10-11 Nm² kg^-2 and is same throughout the universe.

The value of G is independent of the nature and size of the bodies well as the nature of the medium between them.

Dimensional formula of Gis [M^-1L³ T^-2].