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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 .... Middle of paper
.... 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 stabl ....
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Number of words: 318
Number of pages: 2 (approx. 250 words per double-spaced page)
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