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The Dust-Cloud Hypothesis
Part 1 of Paper
....0 (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 th.... Part 2 of Paper
....ecause 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 exces.... |
| Number of words: 318 - Approximate pages: 2 |
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