Gravity is one of the fundamental interactions of nature, in which objects with mass attract one another. Newton’s theory of universal gravitation states that the force between any two distant bodies (m1 and m2) is $F=(G\cdot m1 \cdot m2)/ r^2$, where the gravitational constant G is $6.67\cdot 10^-11 N\cdot m^2 \cdot kg^-2$.