“Excellent.”—Steven Poole, The Wall Street Journal • “Terrific.”—Liz Else, New Scientist (Best Popular Science Books of 2025 So Far) • “A brilliant overview of the state of modern cosmology.”—Alex O'Connor, alexoconnor.com • “This will expand readers’ minds.”—Publishers Weekly • One of Smithsonian's Ten Best Scie...

By most popular accounts, the universe started with a bang some 13.8 billion years ago. But what happened before the Big Bang? And how do we know it happened at all? Here prominent cosmologist Niayesh Afshordi and science communicator Phil Halper offer a tour of the peculiar possibilities: bouncing and cyclic universes, time loops, creations from nothing, multiverses, black hole births, string theories, and holograms. Along the way, they offer both a call for new physics and a riveting sto...