By Stephen Hawking
The up-to-date and improved 10th anniversary variation
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Additional info for A Brief History of Time: The Updated and Expanded Tenth Anniversary Edition
Where did the universe come from, and where is it going? Did the universe have a beginning, and if so, what happened before then? What is the nature of time? Will it ever come to an end? Can we go back in time? Recent breakthroughs in physics, made possible in part by fantastic new technologies, suggest answers to some of these longstanding questions. Someday these answers may seem as obvious to us as the earth orbiting the sun—or perhaps as ridiculous as a tower of tortoises. Only time (whatever that may be) will tell.
Cosmology. I. Title. 1—dc21 98-21874 Bantam Books are published by Bantam Books, a division of Random House, Inc. S. Patent and Trademark Office and in other countries. Marca Registrada. Bantam Books, 1540 Broadway, New York, New York 10036. 1 CONTENTS Cover Other Books by This Author Title Page Copyright FOREWORD Chapter One Our Picture of the Universe Chapter Two Space and Time Chapter Three The Expanding Universe Chapter Four The Uncertainty Principle Chapter Five Elementary Particles and the Forces of Nature Chapter Six Black Holes Chapter Seven Black Holes Ain’t So Black Chapter Eight The Origin and Fate of the Universe Chapter Nine The Arrow of Time Chapter Ten Wormholes and Time Travel Chapter Eleven The Unification of Physics Chapter Twelve Conclusion ALBERT EINSTEIN GALILEO GALILEI ISAAC NEWTON GLOSSARY ACKNOWLEDGMENTS About the Author FOREWORD I didn’t write a foreword to the original edition of A Brief History of Time.
In fact, various contemporaries of Newton had raised the problem, and the Olbers article was not even the first to contain plausible arguments against it. It was, however, the first to be widely noted. The difficulty is that in an infinite static universe nearly every line of sight would end on the surface of a star. Thus one would expect that the whole sky would be as bright as the sun, even at night. Olbers’s counterargument was that the light from distant stars would be dimmed by absorption by intervening matter.