"A Brief History of Time", published in 1988, was a landmark volume in science writing and in world-wide acclaim and popularity, with more than 9 million copies in print globally. The original edition was on the cutting edge of what was then known about the nature of the universe. But the last decade has seen extraordinary advances in the technology of observing both the micro- and the macrocosmic worlds, confirming many of Professor Hawking's theoretical predictions. Eager to bring to his original text the new knowledge revealed by these observations, he has written a new introduction, updated the original chapters throughout, and added an entirely new chapter on the fascinating subject of wormholes and time travel. "A Brief History of Time" has expertly guided nonscientists everywhere in the ongoing search for the tantalizing secrets at the heart of time and space. This edition makes vividly clear why Professor Hawking's eloquent classic has transformed our view of the universe.