G = (6.674215 ± 0.000092) x 10-11 m3/kg/s2 or there abouts is the constant that we multiply to the mass of m1 to m2 divided by the distance squared. This gives us the attractive force between bodies. In the equation F = G(m1m2/r2) it is obvious that the attractive force depends on the mass of each object and exponentially more the distance between them (inversely). This "Big G" though.. what is it? I get that it is the gravitational constant but where does it come from and what is its significance. Why do we need this very tiny number to accurately determine the attractive force of massive bodies? Also how does it represent the strength of gravity as a force? Is it because it is an independent variable?