By Stephen W. Hawking, Ron Miller, Carl Sagan
Stephen Hawking, probably the most extraordinary theoretical physicists in historical past, wrote the trendy vintage a short historical past of Time to assist nonscientists comprehend the questions being requested by means of scientists at the present time: the place did the universe come from? How and why did it start? 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 issues gracefully coated are gravity, black holes, the massive Bang, the character of time, and physicists' look for a grand unifying idea. this can be deep technological know-how; those innovations are so mammoth (or so tiny) as to reason vertigo whereas examining, 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 present of knowing 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
Dirac’s theory was the first of its kind that was consistent with both quantum mechanics and the special theory of relativity. It explained mathematically why the electron had spin-½; that is, why it didn’t look the same if you turned it through only one complete revolution, but did if you turned it through two revolutions. It also predicted that the electron should have a partner: an anti-electron, or positron. The discovery of the positron in 1932 confirmed Dirac’s theory and led to his being awarded the Nobel Prize for physics in 1933.
In 1928 an Indian graduate student, Subrahmanyan Chandrasekhar, set sail for England to study at Cambridge with the British astronomer Sir Arthur Eddington, an expert on general relativity. (According to some accounts, a journalist told Eddington in the early 1920s that he had heard there were only three people in the world who understood general relativity. ”) During his voyage from India, Chandrasekhar worked out how big a star could be and still support itself against its own gravity after it had used up all its fuel.
Particles of spin 0, 1, or 2 do also exist in some circumstances as real particles, when they can be directly detected. They then appear to us as what a classical physicist would call waves, such as waves of light or gravitational waves. They may sometimes be emitted when matter particles interact with each other by exchanging virtual force-carrying particles. ) Force-carrying particles can be grouped into four categories according to the strength of the force that they carry and the particles with which they interact.
A Brief History of Time: From the Big Bang to Black Holes by Stephen W. Hawking, Ron Miller, Carl Sagan