When we observe at the night time sky, the star light we see may have begun its journey to earth many years ago. It is conceivable (although unlikely) that a star we are observing no longer even exists. The maximum speed which which information about a physical event is conveyed between two points is the speed of light, c. Imagine an electron that has been moving at a uniform velocity along the x axis for a long time. The electric field is seen to radiate from the instantaneous position of the charge toward infinity. What is observed if the charge suddenly stops at some time, say t=0? The answer depends on the distance from the charge and the time. An observer a distance greater than r = ct away from the charge would not know that charge has stopped and would see the electric field lines radiating from a point ahead of the actually position, i.e., from a point where the charge would have been if it had continued to moved with uniform velocity. An observer closer than r=ct from the charge will see the expected Coulomb field from a stationary point charge. Clearly there must be a discontinuity on the surface r=ct since: (1)the field lines abruptly change direction and (2) the angular distribution of the field for moving charges not uniform but it is uniform for stationary charges.