Why have we not discovered intergalactic alien life yet?
Enrico Fermi posited that a series of events need to occur for such advanced civilizations to emerge. Life must exist, Life must evolve to sufficiently complex organisms without going extinct, those complex organisms must form a civilization, that civilization must become sufficiently complex without going extinct, and so on.
When we multiply the products of these probabilities, we get the probability of any given planet having a civilization of that threshold level of complexity. There is an astronomically large number of planets in the universe, yet we have not encountered any extraterrestrial life, raising the possibility that perhaps one of these probabilities is a pinch point in the ascent of civilizations.
Here we sit, chatting on the internet as a civilization of hominids that spans the globe and has advanced technology capable of sending signals to the stars. Yet, there is no indisputable […]
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