HUBBLE ULTRA DEEP FIELD
If our Galaxy truly contains many intelligent civilizations, some of which may be ahead of us by a billion years, how is it possible that we have not seen any sign of them yet? Nobody knows the answer to this so-called "Fermi Paradox," but one of the speculations is that there exists some bottleneck to the emergence of intelligent civilizations, and that this bottleneck could have either been in our past, or we will hit upon it in the future.
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