Suppose we have a proton and electron, separated with a distance, d with respect to a stationary observer. Another observer moves with velocity, v with respect to the proton & electron system, and measured that the distance between the proton and electron is D. D < d by length contraction. How could this be? The force between the two charged particles is an EM force dependent radially on the distance. Furthermore, if D < d, then does this mean that a moving atom shrinks in size?