The Fermi Paradox: Why Haven't We Encountered Intelligent Extraterrestrial Life?

TLDR Physicist Enrico Fermi questioned the lack of evidence for intelligent extraterrestrial life, suggesting that interstellar spaceflight may not be possible or that advanced civilizations destroy themselves. Possible explanations for the Fermi Paradox include undiscovered technology, past alien visits, or the possibility that we are the first civilization to arise.

Timestamped Summary

00:00 Physicist Enrico Fermi questioned the existence of intelligent extraterrestrial life by asking why, if there are so many intelligent civilizations, we haven't encountered any.
01:39 The Fermi Paradox is not actually a paradox, but rather an unanswered question that originated from a conversation Enrico Fermi had in 1950, and was first referred to as the Fermi Paradox in 1977.
03:08 If aliens exist, based on the number of stars and planets in the universe, they should have already colonized the entire galaxy by now.
04:31 The Fermi Paradox suggests that the reason we haven't seen evidence of aliens is because interstellar spaceflight might not be possible or the distances are too vast, and another theory is that advanced civilizations destroy themselves before they can communicate with others.
05:49 The Great Filter suggests that there is something that holds most planets or civilizations back from developing complex life, and it is unclear whether this filter is in our past or our future.
07:15 There are several possible explanations for the Fermi Paradox, including the idea that there may be a technology we haven't discovered yet, aliens may have visited Earth in the past or we may be the first civilization to arise, we haven't been looking long enough or in the right places, everyone is listening but no one is broadcasting, or there may be conspiratorial reasons for why we haven't made contact.
08:33 Enrico Fermi speculated that the reason we haven't been visited by aliens is either because interstellar flight is impossible, not worth the effort, or technological civilizations don't last long enough for it to happen.
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