Event discount

Is the universe we live in unique? What lies beyond the boundaries of the universe we see? Was the process that we believe gave birth to our universe – the Big Bang –a singular event or are universes bubbling up all the time? Do we exist in different worlds and live parallel lives?

Such notions would have seemed outrageous a few decades ago: surprisingly, as evidence begins to converge from different directions, they are close to becoming scientific orthodoxy.