The Fermi paradox is the apparent contra…

The Fermi paradox is the apparent contradiction between high estimates of the probability of the existence of extraterrestrial civilizations and the lack of evidence for, or contact with, such civilizations.

http://en.wikipedia.org/wiki/Fermi_Paradox

Personally I think there’s two likely equilibrium states that answer the Fermi Paradox. Either we’re in the pre-Colonization era, before anyone ventures forth and colonizes the lot, due to Life starting late in the Universe’s life because of some recently changed astrophysical process.
Or the Galaxy has been colonized, in which case two sub-divisions seem reasonable:

(1) We’re an undeveloped patch missed by the last few waves of colonization as per Geoff Landis’s Percolation Theory.
(2) Or we haven’t been missed and we’re colonized, but just not how we usually imagine.

http://crowlspace.com/?p=378

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