By Stephen Hawking, Leonard Mlodinow

ISBN-10: 0553385461

ISBN-13: 9780553385465

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

Stephen Hawking’s around the world bestseller, A short background of Time, continues to be one of many landmark volumes in clinical writing of our time. yet for years readers have requested for a extra obtainable formula of its key concepts—the nature of house 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 may consultant nonscientists all over the ongoing look for the tantalizing secrets and techniques on the middle of time and space.

Although “briefer,” this ebook is far 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 most recent advancements within the field—from string idea to the hunt for a unified concept of all of the forces of physics. Thirty-seven full-color illustrations improve 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 technology and ideas.

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Or we could specify that a point is at a certain latitude and longitude and a certain height above sea level. We are free to use any three suitable coordinates, although they have only a limited range of validity. It would not be practical to specify the position of the moon in terms of miles north and miles west of Piccadilly Circus and feet above sea level. Instead, we might describe it in terms of distance from the sun, distance from the plane of the orbits of the planets, and the angle between the line joining the moon to the sun and the line joining the sun to a nearby star such as Proxima Centauri.

This showed that the real effect of a force is always to change the speed of a body, rather than just to set it moving, as was previously thought. It also meant that whenever a body is not acted on by any force, it will keep on moving in a straight line at the same speed. This idea was first stated explicitly in 1687, in Newton’s Principia Mathematica, and is known as Newton’s first law. What happens to a body when a force does act on it is given by Newton’s second law. This states that the body will accelerate, or change its speed, at a rate that is proportional to the force.

Since it was much simpler than Ptolemy’s model, though, one might have expected people to embrace it. Yet 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. 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.

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A Briefer History of Time by Stephen Hawking, Leonard Mlodinow

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