Main Question or Discussion Point
How come gravity and electromagnetism have an infinite range, while the strong nuclear force dies out quickly? I understand that the weak force's bosons, the W+, W- and Z (neutral), have relatively large mass, and decay quickly, while the photon and the graviton (theoretical carrier of gravity) both have zero mass (we have now proved the existence of gravitational waves), giving both an infinite range. However, the strong force's carrier, the gluon, also theoretically has zero mass (experimentally, the maximum mass bound is very low). So how come the strong force turns from attractive to repulsive to nonexistent after the distance is increased (QCD), rather than going on forever?