Another approach to the Femi Paradox:
Why advanced Techno-signatures could evade detection
https://www.spacedaily.com/reports/N...ction_999.html
Quote:
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A recent study published on May 24 in the Astrophysical Journal suggests that advanced extraterrestrial civilizations may be difficult to detect because their energy needs might be modest. If these civilizations do not require significant power, they may not construct large energy-harvesting structures detectable by our telescopes. On Earth, such structures might resemble vast solar panel arrays or orbiting megastructures capturing stellar energy.
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In short, one of the premises behind the paradox may be false.