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

Eugen Leitl eugen at leitl.org
Tue Sep 10 11:30:23 UTC 2013

On Tue, Sep 10, 2013 at 12:18:24PM +0100, BillK wrote:

> Agreed, but the onus is on you to prove that all these coincidences
> are necessary (not just sufficient) to create intelligent life. It is

Proof is simple enough. How's your astrophysics and chemistry?

> possible that life can appear under many different circumstances and

The variability is low, as few areas of the PSE are potentially

> in many different places. There is no requirement for all life to be
> exactly the same as on Earth.

Do you have a problem with the habitability zone? Do you think
life could emerge in solid state or gas phase?
> Even definitions like 'habitable zone' imply habitable for life like
> us. Which may be presumptuous.

It's not, because people who define these terms know how
chemistry works, and have a very good idea what it takes
to boot up self-replicating molecular systems.

People who know little think that everything is possible.
As they learn how much of possibilities have been mapped,
they tend to prune a lot of possibilities.

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