Re: Our rocky solar system may be rare

Robert J. Bradbury (
Sat, 11 Sep 1999 14:31:31 -0700 (PDT)

On Sat, 11 Sep 1999 wrote:

> Or (c) there are multiple hard steps. See Robin Hanson's paper at
> If there are ~5 hard steps
> then it is not surprising that a couple of them took only a few hundred
> million years, if we conditionalize our expectations on the fact that
> we are alive today.

Look at my comments on Robin's paper at: Somewhat out of date because of the more recent work I've done.