Cool early Earth: Difference between revisions
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==External links== |
==External links== |
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*[http://www.science.org] |
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*[http://www.geology.wisc.edu/zircon/cool_early/cool_early_home.html A Cool Early Earth]; [http://www.geology.wisc.edu/zircon/Valley2002Cool_Early_Earth.pdf same as PDF] |
*[http://www.geology.wisc.edu/zircon/cool_early/cool_early_home.html A Cool Early Earth]; [http://www.geology.wisc.edu/zircon/Valley2002Cool_Early_Earth.pdf same as PDF] |
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*[http://www.sciam.com/article.cfm?id=a-cool-early-earth SciAm: A Cool Early Earth] |
*[http://www.sciam.com/article.cfm?id=a-cool-early-earth SciAm: A Cool Early Earth] |
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Revision as of 02:29, 20 July 2011
The cool early Earth (CEE) theory posits that the early planet Earth had a calm influx of bolides and a cool climate allowing fluid water, after the planetary accretion but before the occurrence of the Late Heavy Bombardment in the Hadean geological eon. The Cool Early Earth is believed to have been the state for some hundreds of million years around 4.2 billion years (Ga) ago. This Cool Early Earth theory is supported by supposed water conditions at the creation of western Australian Jack Hills detrital zircons dated to about 4.0–4.4 Ga ago,[1] some time after the planetary accretion era of the early Hadean. The Cool Early Earth was immediately followed by the Late Heavy Bombardment.
See also
References
- ^ Nicholas M. Short, Sr.; et al. "Remote Sensing: The Earth as a Planet". Retrieved December 28, 2008.
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External links
- [1]
- A Cool Early Earth; same as PDF
- SciAm: A Cool Early Earth
- The Cool Early Earth: Valley et al. (abstract)
- ABC Science
- space.com: Good News for Life: Early Earth May Have Been Cool
- Lindsey, Rebecca (March 1, 2006). "Ancient Crystals Suggest Earlier Ocean". NASA Earth Observatory. Retrieved 2006-04-28.
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