How does the force of gravitation between two objects change when the distance between them is reduced to half ?

Explanation

The force of gravitation between two objects is inversely proportional to the square of distance between them. That is, `F prop (1)/(r^(2))`.Now when the distance between two objects is reduced to half ,that is made `1/2` then
the force between them will becomes 4 times `["because"((1)/(1/2))^(2)=4]`.