My guess is that radiated transmissions are to weak to pick up. If I'm reading [1] right it would take 10^21 Watts for a transmission from proxima centauri to r

My guess is that radiated transmissions are to weak to pick up. If I'm reading [1] right it would take 10^21 Watts for a transmission from proxima centauri to reach us with the same rx power as gps signals[2], which are already way below the noise floor. [1] http://gpsinformation.net/main/gpspower.htm http://gpsinformation.net/main/gpspower.htm [2] https://www.wolframalpha.com/input/?i=500W+*+%28distance+to+proxima+centauri+%2F+21000km%29%5E2 https://www.wolframalpha.com/input/?i=500W+*+%28distance+to+...