An anniversary edition of a now-classic survey of the origin and nature of the universe features a new introduction by the author and a new chapter on the possibility of time travel and wormholes in space #1 NEW YORK TIMES BESTSELLER A landmark volume in science writing by one of the great minds of our time, Stephen Hawking's book explores such profound questions as: How did the universe begin-and what made its start possible? Does time always flow forward? Is the universe unending-or are there boundaries? Are there other dimensions in space? What will happen when it all ends? Told in language we all can understand, A Brief History of Time plunges into the exotic realms of black holes and quarks, of antimatter and arrows of time, of the big bang and a bigger God-where the possibilities are wondrous and unexpected. With exciting images and profound imagination, Stephen Hawking brings us closer to the ultimate secrets at the very heart of creation. Foreword vii Our Picture of the Universe 1(14) Space and Time 15(22) The Expanding Universe 37(18) The Uncertainty Principle 55(10) Elementary Particles and the Forces of Nature 65(18) Black Holes 83(20) Black Holes Ain't So Black 103(16) The Origin and Fate of the Universe 119(28) The Arrow of Time 147(12) Wormholes and Time Travel 159(12) The Unification of Physics 171(16) Conclusion 187(5) Albert Einstein 192(2) Galileo Galilei 194(2) Isaac Newton 196(3) Glossary 199(6) Acknowledgments 205(2) Index 207