By Stephen W. Hawking, Ron Miller, Carl Sagan
Stephen Hawking, the most marvelous theoretical physicists in heritage, wrote the trendy vintage a quick background of Time to assist nonscientists comprehend the questions being requested via scientists at the present time: 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 least technical jargon. one of the subject matters gracefully lined are gravity, black holes, the massive Bang, the character of time, and physicists' look for a grand unifying conception. this can be deep technology; those thoughts are so big (or so tiny) as to reason vertigo whereas studying, and one can not help yet wonder at Hawking's skill to synthesize this tough topic for individuals no longer used to wondering 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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Additional resources for A Brief History of Time: From the Big Bang to Black Holes
Cronin and Val Fitch, discovered that even the CP symmetry was not obeyed in the decay of certain particles called K-mesons. Cronin and Fitch eventually received the Nobel Prize for their work in 1980. html (7 of 8) [2/20/2001 3:14:54 AM] A Brief History of Time - Stephen Hawking... Chapter 5 There is a mathematical theorem that says that any theory that obeys quantum mechanics and relativity must always obey the combined symmetry CPT. In other words, the universe would have to behave the same if one replaced particles by antiparticles, took the mirror image, and also reversed the direction of time.
The electromagnetic attraction is pictured as being caused by the exchange of large numbers of virtual massless particles of spin 1, called photons. Again, the photons that are exchanged are virtual particles. However, when an electron changes from one allowed orbit to another one nearer to the nucleus, energy is released and a real photon is emitted – which can be observed as visible light by the human eye, if it has the right wave-length, or by a photon detector such as photographic film. Equally, if a real photon collides with an atom, it may move an electron from an orbit nearer the nucleus to one farther away.
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. In order to avoid this obviously ridiculous result, the German scientist Max Planck suggested in 1900 that light, X rays, and other waves could not be emitted at an arbitrary rate, but only in certain packets that he called quanta.
A Brief History of Time: From the Big Bang to Black Holes by Stephen W. Hawking, Ron Miller, Carl Sagan