Answer:
The Newton's law of gravitation states that the gravitational force between two masses is proportional to the product of both masses and inversely proportional to the square of the distance by which both masses are separated.
[tex]F=\dfrac{GMm}{R^2}[/tex]
So if the distance between both the masses increases then the gravitational force decreases by the square of distance.
So if R increases by small amount then the force between the masses decreases by a significant amount.