[ExI] Life must be everywhere!

[Alfio Puglisi]

On Thu, Apr 12, 2012 at 10:09 AM, BillK <pharos at gmail.com> wrote:

> If life evolved at just 25 different sites in the galaxy 10 billion
> years ago, the combined ejecta from these places would now fill the
> Milky Way.
>
> <
> http://www.kurzweilai.net/the-amazing-trajectories-of-life-bearing-meteorites-from-earth
> >
>
> The amazing trajectories of life-bearing meteorites from Earth
> April 12, 2012
>
> The asteroid that killed the dinosaurs 65 million years ago (10 km in
> diameter, mass greater than 1 trillion tons) must have ejected
> billions of tons of life-bearing meteorites into space. Now Kyoto
> Sangyo University physicists have calculated this could have seeded
> life in the solar system and even as far as Gliese 581.
>
> The probability is almost 1 (close to certain) that our solar system
> is visited by microorganisms that originated outside our solar system.
>

The last sentence doesn't really follow from the rest.  Whatever the number
of rocks which have visited us from other planets, one has first to suppose
that those planets were filled with microorganisms to begin with.

Alfio
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