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The Dust-Cloud Hypothesis - Online Term Paper

The Dust-Cloud Hypothesis

The universe contains huge clouds made up of very large amounts of dustand
gas. About 6,000,000,000 (billion) years ago, one of these clouds began to
condense. Gravitation--the pull that all objects in the universe have for
one another--pulled the gas and dust particles together. As the dust cloud
condensed, it began to spin. It spun faster and faster and flattened as it
spun. It became shaped like a pancake that is thick at the centre and thin
at the edges.

The slowly spinning centre condensed to make the sun. But the outer parts
of the pancake, or disk, were spinning too fast to condense in one piece.
They broke up into smaller swirls, or eddies, which condensed separately ...

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and some of it flowed away into
space. The dust that remained behind then collected together because of
gravity. Although the shrinking earth generated a lot of heat, most of
this heat was lost into space. Therefore, the original earth was most
likely solid, not molten.

This hypothesis was developed by a scientest, Harold C. Urey in 1952. It is
also known as the Urey's hypothesis. He showed that methane, ammonia, and
water are the stable forms of carbon, nitrogen, and oxygen if an excess of
hydrogen is present. Cosmic dust clouds, from which the earth formed,
contained a great excess of ...

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The Dust-Cloud Hypothesis. (2008, December 8). Retrieved January 1, 2026, from http://www.essayworld.com/essays/The-Dust-Cloud-Hypothesis/94302

"The Dust-Cloud Hypothesis." Essayworld.com. Essayworld.com, 8 Dec. 2008. Web. 1 Jan. 2026. <http://www.essayworld.com/essays/The-Dust-Cloud-Hypothesis/94302>

"The Dust-Cloud Hypothesis." Essayworld.com. December 8, 2008. Accessed January 1, 2026. http://www.essayworld.com/essays/The-Dust-Cloud-Hypothesis/94302.

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PAPER DETAILS

Added: 12/8/2008 07:15:04 AM
Category: Science & Nature
Type: Premium Paper
Words: 318
Pages: 2

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