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Personally I think it is far more plausible that the Universe let alone our galaxy is not teeming with advanced civilizations for what ever reason are too shy to announce their existence.
The Fermi paradox was postulated at a time when the infinitely old steady state theory of the Universe was the mainstream theory.
An infinitely old Universe allows "enough time" for advanced civilizations to develop.
Given that it took 3 billion years for "intelligent" life to develop on Earth which is nearly a quarter of the age of the Big Bang it might be the Universe is simply too young to support a large number of advanced civilizations that are even technologically capable of communicating or visiting each other.
Regards
Steven
Last edited by sjastro; 02-01-2017 at 10:04 AM.
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