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This may be a silly question, but is it even possible to detect radio signals from 100ly away?


The short answer is no. Not even from Alpha Centauri 4ly away. A lot of people have misconceptions that we would immediately detect these signals - we would not. MAYBE from Alpha Centauri with a LOT of additional funding and effort, but not as is. Details here:

https://space.stackexchange.com/questions/22617/can-we-commu...




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