Re: Our rocky solar system may be rare

From: Robin Hanson (rhanson@gmu.edu)
Date: Sat Sep 11 1999 - 15:06:10 MDT


CurtAdams@aol.com wrote:
> Given that we get a stable crust ~4 billion years ago and life seems
> to appear at 3.86 billion years ago, that says that (a) it either
> came from space (panspermia); or (b) it is easy.

> I believe Robin Hanson has already addressed these issues of the timing
> of the orgin of life vs. the probability of origin in more detail.

Yes, I have. See"Must Early Life Be Easy? The Rythm of Major Evolutionary
Transitions"
 at http://hanson.berkeley.edu/hardstep.pdf



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