working together to show that the inhabitants of 1000 planets within 100 Parsecs could detect clear signs of life on Sol 3(Earth). However, at 3 quadrillion kilometers they are unlikely to detect intelligence, since we cannot detect it at 1 km, or 10 m.
https://www.businessinsider.com/aliens- ... TLpJ0OGAb0
Lehigh and Cornell
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