Re: Our rocky solar system may be rare

Robin Hanson (
Sat, 11 Sep 1999 17:06:10 -0400 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"