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

By Stephen Hawking, Leonard Mlodinow

ISBN-10: 0553385461

ISBN-13: 9780553385465

From the most incredible minds of our time comes a ebook that clarifies his most vital ideas.

Stephen Hawking’s all over the world bestseller, A short background of Time, is still one of many landmark volumes in medical 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 position of God in construction, and the background and way forward for the universe.

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

Although “briefer,” this publication is way greater than a trifling rationalization of Hawking’s past paintings. A Briefer historical past of Time either clarifies and expands at the nice topics of the unique, and documents the newest advancements within the field—from string concept to the quest for a unified thought of all of the forces of physics. Thirty-seven full-color illustrations improve the textual content and make A Briefer background of Time an exciting and must-have addition in its personal correct to the nice literature of technological know-how and ideas.

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Extra resources for A Briefer History of Time

Example text

The idea of the ether had a certain added attraction for scientists who felt in any case that, just as water waves require water or sound waves require air, waves of electromagnetic energy must require some medium to carry them. In this view, light waves travel through the ether as sound waves travel through air, and their "speed" as derived from Maxwell’s equations should therefore be measured relative to the ether. Different observers would see light coming toward them at different speeds, but light’s speed relative to the ether would remain fixed.

Then two astronomers—the German Johannes Kepler and the Italian Galileo Galilei—started publicly to support the Copernican theory. In 1609, 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. At the same time, Kepler improved Copernicus’s theory, suggesting that the planets moved not in circles but in ellipses.

According to the ether theory, the light travels through the ether at the speed of light. If you move toward it through the ether, the speed at which you approach the light will be the sum of the speed of light through the ether and your speed through the ether. The light will approach you faster than if, say, you didn’t move, or you moved in some other direction. Yet because the speed of light is so great compared to the speeds at which we might move toward a light source, this difference in speed was a very difficult effect to measure.

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A Briefer History of Time by Stephen Hawking, Leonard Mlodinow


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