This paper tries to present a mechanism for Modified Newtonian Dynamics.The gravitational effect, believed to be caused by dark matter, is due to the self-interaction of two gravitational fields around the center line between any two stars. This self-interaction results in increased radial compression of spacetime toward the center line. As will be shown below, it will result in a very slightincrease in gravity between all stars at stellar distances. We know that at interstellar distances, Newtonian gravity is too weak to hold our galaxy together, thus the invention of a halo of dark matter. Very narrow tubes between all starsare holding the Milky Way galaxy together due to two effects: One is that its gravitational acceleration, as empirically estimated by Modified Newtonian Dynamics, by M. Milgrom, decreases only with distance, not with distance squared, as Newtonian gravity does. Ref. 1 The other one is, there are hundreds of trillions of these gravitational flux tubes between the hundreds of billions of stars in our galaxy. A gravitational flux tube can be compared to a bungee tube towrope used by water skiers, which is always under tension.