Gravity is an attractive force which every object with mass exerts. The "relationship" tells us how much gravity is exerted between two objects. The formula is [tex]F g = \frac{G M_1 M_2}{D^2} [/tex]. what this says is that in order to figure out Fg(Force of gravity), we must take into account G( gravitational constant 6.67x10^-11) x M1(mass 1) x M2(mass2) / d^2(ditance squared). Mass is measured in Kg(kilograms). G never changes,and Fg is in Newtons. In terms of planets, you must take into account the radius of the planet within your distance. In Layman terms, You use all three to figure out how much gravity one object exerts on another and vice versa.
