Tim Urban's accessible exploration of the question of why we haven't found extraterrestrial life — covering all major hypotheses from the Great Filter to the Zoo hypothesis.
“The best introduction to the Fermi Paradox that exists. If you only read one thing about astrobiology this year, make it this.”
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The Great Filter framing has stuck with me. The depressing interpretation — that we might have already passed it — is actually the hopeful one.
What gets me is the silence. Not the absence of evidence — the actual silence. If civilizations broadcast, we should be able to hear something. We hear nothing.