[ExI] Eternity in six hours: intergalactic spreading of intelligent life and sharpening the Fermi paradox

[BillK]

On Tue, Sep 10, 2013 at 11:26 AM, Tomaz Kristan  wrote:
> I don't. Consider only one thing. Earth has been closer to Sun and rotated
> more rapidly when the Sun was fainter. Then it slowed down and went out
> toward the Jupiter. All just as fast as is necessary to maintain liquid
> water.
>
> Chances for a random planet to do this are minuscule.
> Several such coincidence were needed.
>


Agreed, but the onus is on you to prove that all these coincidences
are necessary (not just sufficient) to create intelligent life. It is
possible that life can appear under many different circumstances and
in many different places. There is no requirement for all life to be
exactly the same as on Earth.

Even definitions like 'habitable zone' imply habitable for life like
us. Which may be presumptuous.


BillK