The Fermi paradox, named after Italian-American physicist Enrico Fermi, is the apparent contradiction between the lack of evidence for extraterrestrial civilizations elsewhere in the Milky Way galaxy and high estimates of their probability, such as those that result from optimistic choices of parameters in the Drake equation.
Although he was not the first to consider this question, Fermi's name is associated with the paradox because of a casual conversation in the summer of 1950 with fellow physicists Edward Teller, Herbert York and Emil Konopinski. While walking to lunch, the men discussed recent UFO reports and the possibility of faster-than-light travel. The conversation moved on to other topics, until during lunch Fermi suddenly said, "But where is everybody?" (although the exact quote is uncertain).
For anyone wanting to take a deep dive into the subject I would recommend a series by science futurist and youtuber Isaac Arthur starting with the initial episode "The Fermi Paradox Compendium"
https://www.youtube.com/...e0LulClL2dHXh8TTOnCgRkLdU