Origin of Life; Early Earth atmosphere (Introduction)

by dhw, Saturday, December 03, 2011, 16:48 (4739 days ago) @ David Turell

Dhw: It appears that 500 million years after the Big Bang (assuming the Big Bang happened), the Earthâ€™s atmosphere was more like it is today than the other scientists thought.

DAVID: Watch your timing! The BB was 13.7 billion years ago. The sun appeared 5 billion years ago and the formed planets about 4.5 billion years ago. So the 500 million you are tossing about is in Earth age and puts us at 4 billion years ago for the atmosphere discussion. Life definitely apppeared about 3.6 billion years ago, but possibly as early as 3.8 billion years ago. That's as quick as 200 million years to make life from non-life.

Oops! Thank you, David. I did know that, honestly! But as my wife will testify, when I get caught up in these threads, I lose all track of time.

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Origin of Life; pre-planning - David Turell, 2011-10-05, 18:35
- Origin of Life; pre-planning - dhw, 2011-10-06, 17:09
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Origin of Life; Early Earth atmosphere (Introduction)