"Permanence" - An Adaptationist Solution to Fermi's Paradox?

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Anthony Cerrato wrote:


factors.) I have often commented here on the thesis that the
Fermi Paradox might be explained by the simple fact that
ETIs rise and fall regularly, and that the key to SETI is
the size of this window of detection/contact with humanity.
This ain't brain surgery!

This is wrong.
If intelligent life is common in the Galaxy, that there have been
millions of civilisations in the Galactic lifetime, you need to
explain why not a single civilisation has been successful in
populating the entire Galaxy.

It would take only a few tens of million years
to expand to every star in the Galaxy, if you assume a few hundred
years of time to settle in on a new planet and you include the
time of travel with spaceships between stars.

Martin.