Though discovered by scientists only a few decades ago, black holes have become a major object of public fascination and speculation. But how do black holes actually work? And how do they drive the processes we observe in the universe? Black Holes, the second book in an ongoing astronomy series by Rajeev Raghuram, gives an informed overview of black hole physics, spacetime, and the impact of this phenomenon on our universe. Written for a young adult audience, this book synthesizes the latest scientific discoveries and the equations that describe them, presenting this complex, fascinating information in highly accessible terms. Key topics include how black holes form; how they interact with one another; the methods that scientists use to study them; and the physics of spacetime that explain the structure of black holes and point to the possibility of wormholes-even other universes! Equations fundamental to understanding black holes are explained in detail, and numerous diagrams illustrate what happens inside them and how they relate to time and other universes.