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A Brief History of Time Paperback – Illustrated, September 1, 1998
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#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.
- Print length212 pages
- LanguageEnglish
- Publication dateSeptember 1, 1998
- Dimensions5.94 x 0.65 x 8.95 inches
- ISBN-109780553380163
- ISBN-13978-0553380163
- Lexile measure1290L
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From the Publisher
Editorial Reviews
Review
“This book marries a child’s wonder to a genius’s intellect. We journey into Hawking’s universe while marvelling at his mind.”—The Sunday Times (London)
“Masterful.”—The Wall Street Journal
“Charming and lucid . . . [A book of] sunny brilliance.”—The New Yorker
“Lively and provocative . . . Mr. Hawking clearly possesses a natural teacher’s gifts—easy, good-natured humor and an ability to illustrate highly complex propositions with analogies plucked from daily life.”—The New York Times
“Even as he sits helpless in his wheelchair, his mind seems to soar ever more brilliantly across the vastness of space and time to unlock the secrets of the universe.”—Time
From the Inside Flap
Now a decade later, this edition updates the chapters throughout to document those advances, and also includes an entirely new chapter on Wormholes and Time Travel and a new introduction. It make vividly clear why A Brief History of Time has transformed our view of the universe.
From the Back Cover
Now a decade later, this edition updates the chapters throughout to document those advances, and also includes an entirely new chapter on Wormholes and Time Travel and a new introduction. It make vividly clear why "A Brief History of Time has transformed our view of the universe.
About the Author
Stephen Hawking was the Lucasian Professor of Mathematics at the University of Cambridge for thirty years and the recipient of numerous awards and honors including the Presidential Medal of Freedom. His books for the general reader include My Brief History, the classic A Brief History of Time, the essay collection Black Holes and Baby Universes, The Universe in a Nutshell, and, with Leonard Mlodinow, A Briefer History of Time and The Grand Design. Stephen Hawking died in 2018.
Excerpt. © Reprinted by permission. All rights reserved.
Our picture of the universe
A well-known scientist (some say it was Bertrand Russell) once gave a public lecture on astronomy. He described how the earth orbits around the sun and how the sun, in turn, orbits around the center of a vast collection of stars called our galaxy. At the end of the lecture, a little old lady at the back of the room got up and said: “What you have told us is rubbish. The world is really a flat plate supported on the back of a giant tortoise.” The scientist gave a superior smile before replying, “What is the tortoise standing on?” “You’re very clever, young man, very clever,” said the old lady. “But it’s turtles all the way down!”
Most people would find the picture of our universe as an infinite tower of tortoises rather ridiculous, but why do we think we know better? What do we know about the universe, and how do we know it? 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.
As long ago as 340 B.C. the Greek philosopher Aristotle, in his book On the Heavens, was able to put forward two good arguments for believing that the earth was a round sphere rather than a flat plate. First, he realized that eclipses of the moon were caused by the earth coming between the sun and the moon. The earth’s shadow on the moon was always round, which would be true only if the earth was spherical. If the earth had been a flat disk, the shadow would have elongated and elliptical, unless the eclipse always occurred at a time when the sun was directly under the center of the disk. Second, the Greeks knew from their travels that the North Star appeared lower in the sky when viewed in the south than it did in more northerly regions. (Since the North Star lies over the North Pole, it appears to be directly above an observer at the North Pole, but to someone looking from the equator, it appears to lie just at the horizon. From the difference in the apparent position of the North Star in Egypt and Greece, Aristotle even quoted an estimate that the distance around the earth was 400,000 stadia. It is not known exactly what length a stadium was, but it may have been about 200 yards, which would make Aristotle’s estimate about twice the currently accepted figure. The Greeks even had a third argument that the earth must be round, for why else does one first see the sails of a ship coming over the horizon, and only later see the hull?
Aristotle thought the earth was stationary and that the sun, the moon, the planets, and the stars moved in circular orbits about the earth. He believed this because he felt, for mystical reasons, that the earth was the center of the universe, and that circular motion was the most perfect. This idea was elaborated by Ptolemy in the second century A.D. into a complete cosmological model. The earth stood at the center, surrounded by eight spheres that carried the moon, the sun, the stars, and the five planets known at the time, Mercury, Venus, Mars, Jupiter, and Saturn (Fig 1.1). The planets themselves moved on smaller circles attached to their respective spheres in order to account for their rather complicated observed paths in the sky. The outermost sphere carried the so-called fixed stars, which always stay in the same positions relative to each other but which rotate together across the sky. What lay beyond the last sphere was never made very clear, but it certainly was not part of mankind’s observable universe.
Ptolemy’s model provided a reasonably accurate system for predicting the positions of heavenly bodies in the sky. But in order to predict these positions correctly, Ptolemy had to make an assumption that the moon followed a path that sometimes brought it twice as close to the earth as at other times. And that meant that the moon ought sometimes to appear twice as big as at other times! Ptolemy recognized this flaw, but nevertheless his model was generally, although not universally, accepted. It was adopted by the Christian church as the picture of the universe that was in accordance with Scripture, for it had the great advantage that it left lots of room outside the sphere of fixed stars for heaven and hell.
A simpler model, however, was proposed in 1514 by a Polish priest, Nicholas Copernicus. (At first, perhaps for fear of being branded a heretic by his church, Copernicus circulated his model anonymously.) His idea was that the sun was stationary at the center and that the earth and the planets moved in circular orbits around the sun. Nearly a century passed before this idea was taken seriously. Then two astronomers–the German, Johannes Kepler, and the Italian, Galileo Galilei–started publicly to support the Copernican theory, despite the fact that the orbits it predicted did not quite match the ones observed. The death blow to the Aristotelian/Ptolemaic theory came in 1609. In that year, Galileo started observing the night sky with a telescope, which had just been invented. When he looked at the planet Jupiter, Galileo found that it was accompanied by several small satellites or moons that orbited around it. This implied that everything did not have to orbit directly around the earth, as Aristotle and Ptolemy had thought. (It was, of course, still possible to believe that the earth was stationary at the center of the universe and that the moons of Jupiter moved on extremely complicated paths around the earth, giving the appearance that they orbited Jupiter. However, Copernicus’s theory was much simpler.) At the same time, Johannes Kepler had modified Copernicus’s theory, suggesting that the planets moved not in circles but in ellipses (an ellipse is an elongated circle). The predictions now finally matched the observations.
As far as Kepler was concerned, elliptical orbits were merely an ad hoc hypothesis, and a rather repugnant one at that, because ellipses were clearly less perfect than circles. Having discovered almost by accident that elliptical orbits fit the observations well, he could not reconcile them with his idea that the planets were made to orbit the sun by magnetic forces. An explanation was provided only much later, in 1687, when Sir Isaac Newton published his Philosophiae Naturalis Principia Mathematica, probably the most important single work ever published in the physical sciences. In it Newton not only put forward a theory of how bodies move in space and time, but he also developed the complicated mathematics needed to analyze those motions. In addition, Newton postulated a law of universal gravitation according to which each body in the universe was attracted toward every other body by a force that was stronger the more massive the bodies and the closer they were to each other. It was this same force that caused objects to fall to the ground. (The story that Newton was inspired by an apple hitting his head is almost certainly apocryphal. All Newton himself ever said was that the idea of gravity came to him as he sat “in a contemplative mood” and “was occasioned by the fall of an apple.”) Newton went on to show that, according to his law, gravity causes the moon to move in an elliptical orbit around the earth and causes the earth and the planets to follow elliptical paths around the sun.
The Copernican model got rid of Ptolemy’s celestial spheres, and with them, the idea that the universe had a natural boundary. Since “fixed stars” did not appear to change their positions apart from a rotation across the sky caused by the earth spinning on its axis, it became natural to suppose that the fixed stars were objects like our sun but very much farther away.
Newton realized that, according to his theory of gravity, the stars should attract each other, so it seemed they could not remain essentially motionless. Would they not all fall together at some point? In a letter in 1691 to Richard Bentley, another leading thinker of his day, Newton argued that his would indeed happen if there were only a finite number of stars distributed over a finite region of space. But he reasoned that if, on the other hand, there were an infinite number of stars, distributed more or less uniformly over infinite space, this would not happen, because there would not be any central point for them to fall to.
This argument is an instance of the pitfalls that you can encounter in talking about infinity. In an infinite universe, every point can be regarded as the center, because every point has an infinite number of stars on each side of it. The correct approach, it was realized only much later, is to consider the finite situation, in which the stars all fall in on each other, and then to ask how things change if one adds more stars roughly uniformly distributed outside this region. According to Newton’s law, the extra stars would make no difference at all to the original ones on average, so the stars would fall in just as fast. We can add as many stars as we like, but they will still always collapse in on themselves. We now know it is impossible to have an infinite static model of the universe in which gravity is always attractive.
It is an interesting reflection on the general climate of thought before the twentieth century that no one had suggested that the universe was expanding or contracting. It was generally accepted that either the universe had existed forever in an unchanging state, or that it had been created at a finite time in the past more or less as we observe it today. In part this may have been due to people’s tendency to believe in eternal truths, as well as the comfort they found in the thought that even though they may grow old and die, the universe is eternal and unchanging.
Even those who realized that Newton’s theory of gravity showed that the universe could not be static did not think to suggest that it might be expanding. Instead, they attempted to modify the theory by making the gravitational force repulsive at very large distances. This did not significantly affect their predictions of the motions of the planets, but it allowed an infinite distribution of stars to remain in equilibrium–with the attractive forces between nearby stars balanced by the repulsive forces from those that were farther away. However, we now believe such an equilibrium would be unstable: if the stars in some region got only slightly nearer each other, the attractive forces between them would become stronger and dominate over the repulsive forces so that the stars would continue to fall toward each other. On the other hand, if the stars got a bit farther away from each other, the repulsive forces would dominate and drive them farther apart.
Another objection to an infinite static universe is normally ascribed to the German philosopher Heinrich Olbers, who wrote about this theory in 1823. 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. However, if that happened the intervening matter would eventually heat up until it glowed as brightly as the stars. The only way of avoiding the conclusion that the whole of the night sky should be as bright as the surface of the sun would be to assume that the stars had not been shining forever but had turned on at some finite time in the past. In that case the absorbing matter might not have heated up yet or the light from distant stars might not yet have reached us. And that brings us to the question of what could have caused the stars to have turned on in the first place.
The beginning of the universe had, of course, been discussed long before this. According to a number of early cosmologies and the Jewish/Christian/Muslim tradition, the universe started at a finite, and not very distant, time in the past. One argument for such a beginning was the feeling that it was necessary to have “First Cause” to explain the existence of the universe. (Within the universe, you always explained one event as being caused by some earlier event, but the existence of the universe itself could be explained in this way only if it had some beginning.) Another argument was put forward by St. Augustine in his book The City of God. He pointed out that civilization is progressing and we remember who performed this deed or developed that technique. Thus man, and so also perhaps the universe, could not have been around all that long. St. Augustine accepted a date of about 5000 B.C. for the Creation of the universe according to the book of Genesis. (It is interesting that this is not so far from the end of the last Ice Age, about 10,000 B.C., which is when archaeologists tell us that civilization really began.)
Aristotle, and most of the other Greek philosophers, on the other hand, did not like the idea of a creation because it smacked too much of divine intervention. They believed, therefore, that the human race and the world around it had existed, and would exist, forever. The ancients had already considered the argument about progress described above, and answered it by saying that there had been periodic floods or other disasters that repeatedly set the human race right back to the beginning of civilization.
Product details
- ASIN : 0553380168
- Publisher : Random House Publishing Group; 10th anniversary edition (September 1, 1998)
- Language : English
- Paperback : 212 pages
- ISBN-10 : 9780553380163
- ISBN-13 : 978-0553380163
- Lexile measure : 1290L
- Item Weight : 2.31 pounds
- Dimensions : 5.94 x 0.65 x 8.95 inches
- Best Sellers Rank: #3,994 in Books (See Top 100 in Books)
- #1 in Relativity Physics (Books)
- #3 in Cosmology (Books)
- #5 in Astronomy (Books)
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About the author
Stephen Hawking's ability to make science understandable and compelling to a lay audience was established with the publication of his first book, A Brief History of Time, which has sold nearly 10 million copies in 40 languages. Hawking has authored or participated in the creation of numerous other popular science books, including The Universe in a Nutshell, A Briefer History of Time, On the Shoulders of Giants, The Illustrated On the Shoulders of Giants, and George's Secret Key to the Universe.
(Stephen William Hawking; Oxford, Reino Unido, 8 de Enero de 1942 - Cambridge, 14 de marzo de 2018) Físico teórico británico. A pesar de sus discapacidades físicas y de las progresivas limitaciones impuestas por la enfermedad degenerativa que padecía, Stephen William Hawking es probablemente el físico más conocido entre el gran público desde los tiempos de Einstein. Luchador y triunfador, a lo largo de toda su vida logró sortear la inmensidad de impedimentos que le planteó el mal de Lou Gehrig, una esclerosis lateral amiotrófica que le aquejaba desde que tenía 20 años. Hawking es, sin duda, un ejemplo particular de vitalidad y resistencia frente al infortunio del destino.
Fue miembro de la Real Sociedad de Londres, de la Academia Pontificia de las Ciencias y de la Academia Nacional de Ciencias de Estados Unidos. Fue titular de la Cátedra Lucasiana de Matemáticas (Lucasian Chair of Mathematics) de la Universidad de Cambridge desde 1979 hasta su jubilación en 2009. Entre las numerosas distinciones que le han sido concedidas, Hawking ha sido honrado con doce doctorados honoris causa y ha sido galardonado con la Orden del Imperio Británico (grado CBE) en 1982, el Premio Príncipe de Asturias de la Concordia en 1989, la Medalla Copley en 2006, la Medalla de la Libertad en 2009 y el Premio Fundación BBVA Fronteras del Conocimiento en 2015.
Alcanzó éxitos de ventas con sus trabajos divulgativos sobre Ciencia, en los que discute sobre sus propias teorías y la cosmología en general; estos incluyen A Brief History of Time, que estuvo en la lista de best-sellers del The Sunday Times británico durante 237 semanas.
La Editorial Alvi Books le dedicó, como tributo y reconocimiento, este espacio en Amazon en 2016.
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Thus far, it seems like the perfect scientific book to read – it’s light, clever, and even funny at times. Yet, some parts of the text became extremely complex and impossible to follow. It didn’t help that the author expected the audience to have prior knowledge of the historical events which connect with the theories being discussed: “In fact bursts of gamma rays from space have been detected by satellites originally constructed to look for violations of the Test Ban Treaty” (115). While knowing exactly what the treaty was about is not directly necessary for a comprehension of the ideas in the book, it would undoubtedly be more helpful if a quick snippet of historical information was included in the text. The complexity of the theory’s descriptions, on the other hand, have absolutely nothing to do with the book itself. Stephen Hawking included an abundance of analogies and explained the complicated concepts of wormholes in as simple of language as possible. The issue is not with the author and the writing style – the subject itself makes it challenging to follow the ideas on the paper. If the idea of having to reread the same paragraph multiple times upsets you – A Brief History of Time is definitely not the book for you.
All in all this is an outstanding scientific text, a classic even. The depth of the material that is being discussed in a syntax which an average teenager can understand is unbelievable at times. This book will answer the questions (and raise just as many new ones) you always had about anything to do with universe topics which are never discussed with the general public So, should you read this book? Heck yes.
Hawking's genius lies not only in his profound understanding of cosmology but also in his ability to translate complex concepts into digestible prose. The book effortlessly walks you through theories of relativity, quantum mechanics, black holes, and the Big Bang Theory, among others. Each page unfolds with thrilling revelations about our universe, making it feel as if you're venturing into the farthest reaches of space right from your living room.
That said, the complexity of the topics discussed necessitates a level of concentration and intellectual curiosity from the reader. Some concepts may need to be revisited multiple times for complete understanding. This makes the book a continuous exploration rather than a one-time read.
Despite the challenges, the knowledge and perspective gained from "A Brief History of Time" make it a rewarding read. It invites us to reflect on our place in the cosmos and pushes us to contemplate the very nature of existence.
Ratings:
Readability: 7/10
Depth of Content: 9/10
Intellectual Stimulation: 10/10
Accessibility of Subject Matter: 8/10
Overall: 8.5/10 - A riveting journey through the cosmos that challenges, enlightens, and awakens the star-gazer in us all. Take a leap into the unknown with "A Brief History of Time".
What sets this book apart is its ability to transcend typical scientific discourse, presenting theories not just as scholarly facts but as dynamic, pulsating stories that invite wonder and exploration. The reader is taken on a journey through the cosmos, exploring the fundamental questions of existence and our place within it. This is enhanced by Hawking's thoughtful prose that, while deeply informative, remains engaging and surprisingly light.
This edition is well-structured, with each chapter building on the previous, ensuring a coherent flow that aids understanding. The inclusion of diagrams and illustrations helps clarify topics that might otherwise seem daunting, and the quality of the book’s binding and presentation aligns with its excellent content.
For anyone looking to dip their toes into the vast ocean of astrophysics and cosmology without feeling overwhelmed, "A Brief History of Time" is a perfect starting point. It serves as a wonderful gift for a budding scientist or any reader with a thirst for knowledge about the universe’s mysteries.
"A Brief History of Time" is more than just a book; it is an invitation to think deeply about the universe and our spectacular place within it. Stephen Hawking’s legacy as a brilliant mind and communicator shines brightly in these pages, making this work a must-read that is sure to ignite a lasting passion for science.
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Reviewed in India on March 6, 2023