Do ‘bouncing universes’ have a beginning?

BUFFALO, N.Y. — In trying to understand the nature of the cosmos, some theorists propose that the universe expands and contracts in endless cycles. Because this behavior is hypothesized to be …BUFFALO, N.Y. — In trying to understand the nature of the cosmos, some theorists propose that the universe expands and contracts in endless cycles. Because this behavior is hypothesized to be …