An infinite series of contingent universes is no real explanation, either—we just have an endless set of universes that exist as a brute, unexplained fact. This explanation is like saying a boxcar on a train moves because it is pulled by the boxcar in front of it, which in turn is pulled by an infinite set of boxcars. But boxcars depend on something else in order to move, and therefore even an infinite number of boxcars could not move one
