We think that life came from non-life, from the increasing complexity of chemical reactions between biomolecules present on the primordial Earth. But what about the universe? How did it come to be if there was nothing before? iStockphoto hide caption

itoggle caption iStockphoto

An artist's impression shows the area around a supermassive black hole at the heart of the galaxy NGC 3783 in the southern constellation of Centaurus. Could a wormhole connect one black hole to another elsewhere in the Universe, creating an entangled pair? M. Kornmesser/ESO hide caption

itoggle caption M. Kornmesser/ESO