Comment Re:why is it all these earth like worlds but no li (Score 1) 58
You're assuming that they use some communication method that we can measure/receive... what if they use telepathy or some weird Quantum communication system.
Our little blue marble of a planet craps out tons of RF garbage by the second... not every single civilization out in the far reaches (did you interrogate the Borg?) uses what we can detect as a communication medium.
Your 3-watt wireless router is barely enough to reach the basement, let alone the second floor... you can only see your houses' powerful WiFi if you're standing just right in your friends' house.
What would their WiFi look like to us? What would their Ethernet traffic look like?
Could we differentiate between their crap and the usual noise?