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

[Tomaz Kristan]

Rocks live in the Moon. Clouds live on Jupiter, sand storms live on Earth
and Mars. Clouds live on Venus. As do rocks.

This we know by the signals we've got from them.

We don't get any signal from an interstellar civilization activity. As if
there were none.

The conquering of the Universe would be a satisfying signal for me.
Anything else is not a sufficiently credible signal.




On Tue, Sep 10, 2013 at 1:18 PM, BillK <pharos at gmail.com> wrote:

> 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
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