By Stephen Hawking, Leonard Mlodinow
From the most fantastic minds of our time comes a booklet that clarifies his most crucial ideas.
Stephen Hawking’s around the world bestseller, A short historical past 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 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 might 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 an insignificant clarification of Hawking’s previous paintings. A Briefer heritage of Time either clarifies and expands at the nice matters of the unique, and files the newest advancements within the field—from string idea to the quest for a unified idea of all of the forces of physics. Thirty-seven full-color illustrations improve the textual content and make A Briefer historical past of Time an exciting and must-have addition in its personal correct to the good literature of technological know-how and ideas.
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Additional info for A Briefer History of Time
3 THE NATURE OF A SCIENTIFIC THEORY IN ORDER TO TALK ABOUT THE nature of the universe and to discuss such questions as whether it has a beginning or an end, you have to be clear about what a scientific theory is. We shall take the simpleminded view that a theory is just a model of the universe, or a restricted part of it, and a set of rules that relate quantities in the model to observations that we make. It exists only in our minds and does not have any other reality (whatever that might mean).
The Speed of Light and the Timing of Eclipses The observed times of the eclipses of Jupiter’s moons depend on both the actual time of the eclipses and the time it takes their light to travel from Jupiter to the earth Thus the eclipses seem to appear more frequently when Jupiter is moving toward the earth, and less frequently when it is moving away This effect is exaggerated here for clarity A proper theory of the propagation of light didn’t come until 1865, when the British physicist James Clerk Maxwell succeeded in unifying the partial theories that up to then had been used to describe the forces of electricity and magnetism.
In fact, now that you are accelerating, everything that happens inside the elevator will unfold exactly as it would if the elevator was not moving at all but at rest in a uniform gravitational field. Einstein realized that just as you cannot tell from inside a train whether or not you are moving uniformly, you also cannot tell from inside the elevator whether you are uniformly accelerating or in a uniform gravitational field. The result was his principle of equivalence. The principle of equivalence, and the above example of it, is true only if inertial mass (the mass in Newton’s second law that determines how much you accelerate in response to a force) and gravitational mass (the mass in Newton’s law of gravity that determines how much gravitational force you feel) are the same thing (see Chapter 4).
A Briefer History of Time by Stephen Hawking, Leonard Mlodinow