RE: Extinctions, bottlenecks and filters.

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It is true, there will be more advanced civilizations than ours, due to the probability and time of the universe; There we fall into the Fermi paradox, where are they?...

Thanks, regards

hive-196387 science space astronomy astrophysics intelligent civilizations extraterrestrial life neoxian inleo
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Academician Nikolai Kardashev had an interesting answer to this question. I favor the zoo hypothesis.

I like the Strugatsky brothers' story "Hard to Be a God" (but I don't think that's how observation works).

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