Download e-book for kindle: A Briefer History of Time by Stephen Hawking, Leonard Mlodinow

By Stephen Hawking, Leonard Mlodinow

ISBN-10: 0553385461

ISBN-13: 9780553385465

From essentially the most amazing minds of our time comes a e-book that clarifies his most crucial ideas.

Stephen Hawking’s around the world bestseller, A short heritage of Time, is still one of many landmark volumes in clinical writing of our time. yet for years readers have requested for a extra available formula of its key concepts—the nature of area and time, the function of God in construction, and the background and way forward for the universe.

Professor Hawking’s reaction is that this new paintings that may advisor nonscientists all around the ongoing look for the tantalizing secrets and techniques on the middle of time and space.

Although “briefer,” this e-book is way greater than an insignificant clarification of Hawking’s prior paintings. A Briefer background of Time either clarifies and expands at the nice matters of the unique, and documents the newest advancements within the field—from string idea to the hunt for a unified conception of the entire forces of physics. Thirty-seven full-color illustrations improve the textual content and make A Briefer historical past of Time a thrilling and must-have addition in its personal correct to the nice literature of technological know-how and concepts.

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Example text

This was difficult to reconcile with Newton’s theory that there is no absolute standard of rest, because if there is no such standard, there can be no universal agreement on the speed of an object. To understand why, again imagine yourself playing Ping-Pong on the train. If you hit the ball toward the front of the train with a speed your opponent measures to be ten miles per hour, then you’d expect an observer on the platform to perceive the ball moving at one hundred miles per hour—the ten it is moving relative to the train, plus the ninety the train is moving relative to the platform.

The ideas about scientific theories outlined above assume we are rational beings who are free to observe the universe as we want and to draw logical deductions from what we see. In such a scheme it is reasonable to suppose that we might progress ever closer toward the laws that govern our universe. Yet if there really were a complete unified theory, it would also presumably determine our actions—so the theory itself would determine the outcome of our search for it! And why should it determine that we come to the right conclusions from the evidence?

Aristotle noticed that the earth’s shadow was always round. This is what you would expect if the earth was a sphere, but not if it was a flat disk. If the earth were a flat disk, its shadow would be round only if the eclipse happened at a time when the sun was directly under the center of the disk. At other times the shadow would be elongated—in the shape of an ellipse (an ellipse is an elongated circle). The Greeks had another argument for the earth being round. If the earth were flat, you would expect a ship approaching from the horizon to appear first as a tiny, featureless dot.

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A Briefer History of Time by Stephen Hawking, Leonard Mlodinow

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