Science

New PDF release: A Briefer History of Time

By Stephen Hawking, Leonard Mlodinow

ISBN-10: 0553385461

ISBN-13: 9780553385465

From probably the most very good minds of our time comes a publication that clarifies his most vital ideas.

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

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

Although “briefer,” this booklet is far 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 most recent advancements within the field—from string concept to the hunt for a unified conception of the entire forces of physics. Thirty-seven full-color illustrations increase the textual content and make A Briefer background of Time a thrilling and must-have addition in its personal correct to the good literature of technological know-how and ideas.

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Additional resources for A Briefer History of Time

Example text

This was simple enough but did not make any definite predictions. On the other hand, Newton’s theory of gravity was based on an even simpler model, in which bodies attracted each other with a force that was proportional to a quantity called their mass and inversely proportional to the square of the distance between them. Yet it predicts the motions of the sun, the moon, and the planets to a high degree of accuracy. Any physical theory is always provisional, in the sense that it is only a hypothesis: you can never prove it.

It turns out to be very difficult to devise a theory to describe the universe all in one go. Instead, we break the problem up into bits and invent a number of partial theories. Each of these partial theories describes and predicts a certain limited class of observations, neglecting the effects of other quantities, or representing them by simple sets of numbers. It may be that this approach is completely wrong. If everything in the universe depends on everything else in a fundamental way, it might be impossible to get close to a full solution by investigating parts of the problem in isolation.

Just as it takes energy to get your car moving, it takes energy to increase the speed of any object. The kinetic energy of a moving object is identical to the energy you must expend in causing it to move. Therefore, the faster an object moves, the more kinetic energy it possesses. But according to the equivalence of energy and mass, kinetic energy adds to an object’s mass, so the faster an object moves, the harder it is to further increase the object’s speed. This effect is really significant only for objects moving at speeds close to the speed of light.

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A Briefer History of Time by Stephen Hawking, Leonard Mlodinow


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