Re: It may be hard for life to get started

From: John Clark (
Date: Thu Jan 11 2001 - 12:01:17 MST

 Michael S. Lorrey <> Wrote:

> What it means is that once you realize the late peak in bombardment that
> occured immediately before the earliest fossil evidence,

The earliest fossil evidence is 3.85 billion years old, the peak in bombardment
was 4.5 billion years ago when an object the size of Mars hit the Earth forcing
a huge cloud of debris into orbit that later coalesced into the moon. I wouldn't
call 650 million years "immediate".

>that it was the bombardment that eliminated any early life signs we are currently
>able to spot,

Perhaps a later and lesser bombardment did as you say, but if it wasn't strong enough
to eliminate signs of water I'm not sure it would be strong enough to eliminate signs of life.

       John K Clark

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