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The Fermi Paradox (alleged, and first mentioned in this paper from Carl Sagan)
Ah, yes, another one that has inspired mounds of great fiction.
The interesting thing tho: why, on a document from the height of the Cold War, hosted by NASA, is there a "summary" in Russian on the last page?
The Fermi Paradox (alleged, and first mentioned in this paper from Carl Sagan)