Modern physics has revealed our knowledge of the universe as a much stranger place than we could have imagined. The puzzle at the center of our understanding of the universe is time. Michael Lockwood takes the reader on a fascinating journey into the nature of things. He investigates philosophical questions about the past, present, and future, our experience of time, and the possibility of time travel. And he provides the most careful, lively, and up-to-date introduction to the physics of time and the structure of the universe. His aim is not just to boggle the mind, but to lead the reader towards an understanding of the science and philosophy.