Download e-book for kindle: A Brief History of Time: From the Big Bang to Black Holes by Stephen W. Hawking, Ron Miller, Carl Sagan

By Stephen W. Hawking, Ron Miller, Carl Sagan

ISBN-10: 055305340X

ISBN-13: 9780553053401

Stephen Hawking, essentially the most marvelous theoretical physicists in heritage, wrote the trendy vintage a short historical past of Time to assist nonscientists comprehend the questions being requested via scientists this day: the place did the universe come from? How and why did it commence? Will it come to an finish, and if this is the case, how? Hawking makes an attempt to bare those questions (and the place we are trying to find solutions) utilizing at the very least technical jargon. one of the issues gracefully lined are gravity, black holes, the massive Bang, the character of time, and physicists' look for a grand unifying conception. this is often deep technology; those innovations are so enormous (or so tiny) as to reason vertigo whereas interpreting, and one can not help yet wonder at Hawking's skill to synthesize this tough topic for individuals no longer used to considering such things as trade dimensions. the adventure is definitely worthy taking, for, as Hawking says, the gift of realizing the universe could be a glimpse of "the brain of God."

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According to the laws we believed at the time, a hot body ought to give off electromagnetic waves (such as radio waves, visible light, or X rays) equally at all frequencies. For example, a hot body should radiate the same amount of energy in waves with frequencies between one and two million million waves a second as in waves with frequencies between two and three million million waves a second. Now since the number of waves a second is unlimited, this would mean that the total energy radiated would be infinite.

The idea was this: when the star becomes small, the matter particles get very near each other, and so according to the Pauli exclusion principle, they must have very different velocities. This makes them move away from each other and so tends to make the star expand. html (1 of 9) [2/20/2001 3:15:08 AM] A Brief History of Time - Stephen Hawking... Chapter 6 gravity was balanced by the heat. Chandrasekhar realized, however, that there is a limit to the repulsion that the exclusion principle can provide.

That theory, quantum mechanics, will be described next, before we turn to the efforts to combine the two partial theories into a single quantum theory of gravity. html (9 of 9) [2/20/2001 3:14:24 AM] A Brief History of Time - Stephen Hawking... Chapter 4 CHAPTER 4 THE UNCERTAINTY PRINCIPLE The success of scientific theories, particularly Newton’s theory of gravity, led the French scientist the Marquis de Laplace at the beginning of the nineteenth century to argue that the universe was completely deterministic.

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A Brief History of Time: From the Big Bang to Black Holes by Stephen W. Hawking, Ron Miller, Carl Sagan


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