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The Dust-Cloud Hypothesis
Beginning of paper
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 an ....
Middle of paper
....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 hydrogen.
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| Word count: 318 |
Page count: 2 |
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