Cool early Earth
The cool early Earth (CEE) theory posits that early during its evolutionary history, 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 detrital zircon at Jack Hills in Western Australia, 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. (June 18, 2007). "Remote Sensing: The Earth as a Planet". Retrieved December 28, 2008.
External links
- 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.