As pondered by Italian physicist Enrico Fermi. With over 70 sextillion stars in the visible universe, a fair number of which would have planetary systems, why hasn’t even the slightest indication of intelligent life beyond Earth ever been detected?
Fermi reasoned, if there are other advanced extraterrestrial civilizations, then why is there no evidence of such, like spacecraft or probes floating around the Milky Way. His question became famously known as the Fermi Paradox. The paradox is the contradiction between the high estimates of the probability of the existence of extraterrestrial civilizations and yet the lack of evidence for, or contact with, any such civilizations.
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