From the best-selling author of The Elegant Universe and The Fabric of the Cosmos: his most thrilling and accessible book to date—a state-of-the-art tour of the cutting-edge science that is changing the way we see our world.In recent years, a growing body of work—based on the principles of quantum mechanics, cosmology, and string theory—has been steadily converging around a proposal that our universe is actually only one of many universes. In fact, research supports a number of different models of parallel universes in which our world appears: for instance, as one of many “bubbles” in a rapidly growing bath of universes, or as one of numerous cosmic slabs separated from one another through additional spatial dimensions.Brian Greene, with his trademark impartiality, crystal-clear prose, and inspired use of analogy, opens up the strange worlds of the “multiverse,” taking us on a journey grounded firmly in science, and limited only by our ima ginations.