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Hadean
(redirected from Hadean eon)

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Hadean [′hā·dē·ən]
(geology)
The period (more than 3800 million years ago) extending for several hundred millions of years from the end of the accretion of the earth to the formation of the oldest recognized rocks.
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Impact evidence from lunar samples, meteorites and the pockmarked surfaces of the inner planets paints a picture of a violent environment in the solar system during the Hadean Eon 4.
Asteroids may have boosted life on Earth 3.9 billion years ago by Asian News International
That's slightly higher than Earth's average heat loss today but only one-third to one-fifth the rate expected for the Hadean eon.
Plate tectonics may have had an early start: ancient zircon crystals ... by Perkins, Sid / Science News
Geologists call that time the Hadean Eon, and thought its fiery hell of impacts would have sterilised the Earth.
Life may have survived Earth's early pounding 3.9 billion years ago by Asian News International
 
 
 
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