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100 years of SETI: what has been learned?

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Strong empirical evidence demonstrates that a communicative technological extraterrestrial is unlikely to exist now within 500 light-years of Earth or to have passed within 100 light-years of Earth during the past few billion years. The evidence is based on numerous sky surveys at various electromagnetic wavelengths that date back ~100 years, and on the absence of an alien probe in Earth orbit.

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