Cosmology - Research Article from Macmillan Science Library: Space Sciences

This encyclopedia article consists of approximately 6 pages of information about Cosmology.
This section contains 1,633 words
(approx. 6 pages at 300 words per page)
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The History of the Universe: in the Beginning

The universe began in what astronomers dubbed the "Big Bang"—an initial event, after which the universe began to expand. Current estimates place the Big Bang at about 13 to 15 × 109 years ago. During the first seconds after the Big Bang, the universe was extremely hot and dense. The physics needed to understand the universe in these early stages is very speculative because it is impossible to recreate these conditions in an experiment today to check the predictions of the theory. Before 10-44 seconds after the Big Bang, the four fundamental forces of nature—gravity, the electromagnetic force, and the strong and weak nuclear forces—were unified into a single force. At 10-44 seconds, gravity separated from the others; at 10-34 seconds, the strong force became separated; and at 10-11 seconds, the weak force separated from the electromagnetic force...

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This section contains 1,633 words
(approx. 6 pages at 300 words per page)
Buy the Cosmology Encyclopedia Article
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Macmillan Science Library: Space Sciences
Cosmology from Macmillan Science Library: Space Sciences. Copyright © 2001-2006 by Macmillan Reference USA, an imprint of the Gale Group. All rights reserved.
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