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A brief history of time : from the big bang to black holes by S W Hawking

By S W Hawking

A quick heritage of Time, released in 1988, was once a landmark quantity in technological know-how writing and in world-wide acclaim and recognition, with greater than nine million copies in print globally. the unique version was once at the innovative of what was once then identified in regards to the origins and nature of the universe. however the resulting years have visible remarkable advances within the expertise of looking at either the micro- and the macrocosmic world--observations that experience proven a lot of Hawking's theoretical predictions within the first variation of his book.Now a decade later, this version updates the chapters all through to rfile these advances, and in addition contains a completely new bankruptcy on Wormholes and Time commute and a brand new creation. It make vividly transparent why a quick background of Time has reworked our view of the universe

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Extra resources for A brief history of time : from the big bang to black holes

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This would mean that the atom, and indeed all matter, should rapidly collapse to a state of very high density. A partial solution to this problem was found by the Danish scientist Niels Bohr in 1913. He suggested that maybe the electrons were not able to orbit at just any distance from the central nucleus but only at certain specified distances. If one also supposed that only one or two electrons could orbit at any one of these distances, this would solve the problem of the collapse of the atom, because the electrons could not spiral in any farther than to fill up the orbits with e least distances and energies.

Chapter 5 Figure 5:2 Figure 5:2 shows a photograph of a collision between a high-energy proton and antiproton. The success of the unification of the electromagnetic and weak nuclear forces led to a number of attempts to combine these two forces with the strong nuclear force into what is called a grand unified theory (or GUT). This title is rather an exaggeration: the resultant theories are not all that grand, nor are they fully unified, as they do not include gravity. Nor are they really complete theories, because they contain a number of parameters whose values cannot be predicted from the theory but have to be chosen to fit in with experiment.

For centuries the argument continued without any real evidence on either side, but in 1803 the British chemist and physicist John Dalton pointed out that the fact that chemical compounds always combined in certain proportions could be explained by the grouping together of atoms to form units called molecules. However, the argument between the two schools of thought was not finally settled in favor of the atomists until the early years of this century. One of the important pieces of physical evidence was provided by Einstein.

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