About Time: Einstein's Unfinished Revolution by Paul C. W. Davies

By Paul C. W. Davies

A sublime, witty, and interesting exploration of the riddle of time, which examines the results of Einstein's conception of relativity and provides startling feedback approximately what fresh learn could reveal.
The everlasting questions of technological know-how and faith have been profoundly recast through Einstein's concept of relativity and its implications that point may be warped through movement and gravitation, and that it can't be meaningfully divided into earlier, current, and future.

In approximately Time, Paul Davies discusses the large bang concept, chaos thought, and the new discovery that the universe seems to be more youthful than a few of the items in it, concluding that Einstein's idea presents merely an incomplete realizing of the character of time. Davies explores unanswered questions such as:

* Does the universe have a starting and an end?

* Is the passage of time in basic terms an illusion?

* Is it attainable to trip backward -- or ahead -- in time?

About Time weaves physics and metaphysics in a provocative contemplation of time and the universe.

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When a radioactive substance is incorporated into a mineral or a living organism, or even the solar system as a whole, it behaves as if a stopwatch has been activated. The amount of radioactivity decreases in a predictable manner, falling by half in a fixed period of time, called the half-­life, which is unique to each radioactive material. After two half-­lives, only a quarter of the radioactive material remains, one-­eighth is left after three half-­lives, and so on. When a radioactive element decays, it typically changes into another element, often one with very different physical and chemical properties, allowing the decay process to be clearly identified.

To find a major planet would bring international fame to any astronomer, professional or amateur. However, professionals generally regarded the task as hopeless without some theoretical prediction that would greatly narrow down the area to be searched. Predicting the new planet’s location seemed a daunting mathematical problem, and it was dismissed as virtually impossible by eminent astronomers such as the British Astronomer Royal, George Biddell Airy, himself a talented mathematician. Airy’s opinion did not deter John Couch Adams, however.

Herschel assumed he had found a comet. Others, such as the Astronomer Royal, Nevil Maskelyne, were not so sure. Over the next few months, the new object failed to grow the fuzzy coma and tail characteristic of a comet, and mathematicians began to compute its orbit. By the summer it was clear that Herschel had discovered a new planet instead, the first person in recorded history to do so. Six years later, Herschel found two moons orbiting the planet, which were later named Titania and Oberon. The name of the planet itself remained a matter of dispute for some time.

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