26. Why does the length of matter vary with velocity?

            When matter is at rest (with respect to the background gas) the neutrino making up the particle has a circular path. When moving the neutrino takes a spiral path. When viewed from a frame moving at the particle velocity the spiral path becomes a closed path. Angular momentum conservation requires that the path be an ellipse. The minor axis of the ellipse is parallel to the motion and is  times the diameter of the particle orbit when at rest. This results in all matter being shortened in the direction of motion by this factor.