Stephen Hawking's A Brief History of Time has become an international publishing phenomenon. Translated into thirty languages, it has sold over nine million copies worldwide and lives on as a science book that continues to captivate and inspire new readers each year. When it was first published in 1988 the ideas discussed in it were at the cutting edge of what was then known about the universe. In the intervening ten years there have been extraordinary advances in the technology of observing both the micro- and macro-cosmic world. Indeed, during that time cosmology and the theoretical sciences have entered a new golden age. Professor Hawking is one of the major scientists and thinkers to have contributed to this renaissance. In this special, fully updated edition, which marks the tenth anniversary of the book's original ground-breaking publication, Professor Hawking has included the most recent developments in the field, many of which were forecast by him. He has also written a new introduction as well as an additional chapter on wormholes and time travel. A Brief History of Time has rightly been hailed as the publishing sensation of the past decade and is surely destined to become one of the greatest classics of science writing.