From Ben Andrew Henry at Science:
“Earth’s surface 3.7 billion years ago was a tumultuous place, bombarded by asteroids and still in its formative stages,” Allwood writes. “If life could find a foothold here, and leave such an imprint that vestiges exist even though only a minuscule sliver of metamorphic rock is all that remains from that time, then life is not a fussy, reluctant and unlikely thing. Give life half an opportunity and it’ll run with it.”More.
Really? Just half a chance? But then why isn’t spontaneous generation happening now, when conditions are more favorable?
See also: Oldest fossils found in Greenland shrink time for origin of life: If it is true that life existed by ~3.7 billion years ago during the Hadean [(> 4,000 Ma)], it evolved very quickly after Earth became habitable. We are left with only a couple hundred million years for life to develop. Considering the improbabilities of the origin of life, that’s a very short period for life to have happened without intelligent direction.
What we know and don’t know about the origin of life
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