The ultimate must-have science book. A multimillion copy bestseller. A popular book about the nature of the universe, written for the general reader by one of the world's greatest ever thinkers. A Brief History of Time poses questions such as: Was there a beginning of time? Could time run backwards? Is the universe infinite or does it have boundaries? This internationally acclaimed masterpiece begins by reviewing the great theories of the cosmos from Newton to Einstein, before delving into the secrets which still lie at the heart of space and time, from the Big Bang to black holes, via spiral galaxies and strong theory. To this day A Brief History of Time remains a keystone of the scientific canon, and its succinct and clear language continues to introduce millions to the universe and its wonders. This revised edition includes updates from Stephen Hawking with his most recent thoughts about the No Boundary Proposal and with information about dark energy, the information paradox, eternal inflation, the microwave background radiation observations, and the discovery of gravitational waves.