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1. Radio is tuned for analogue signals, and the natural universe is full of them. We, until recently, we predominatly using analogue, but pretty much all of our comms is now moving to digital. Within 100 years, analogue has become virtually extinct as a carrier of communications, and used only as a "fall back". Advanced ET would most certainly use digital! 2. If you wanted to communicate with other members of your advanced race over a great distance, would you send it clear text? Of course not, you would encrypt it, just incase any pesky low grade civilizations happen to intercept it. Encrypted digital signals look very much like noise, high entropy signals! Plus without the cypher or key, will not be able to be decrypted anyway (imagine the potential complexity of thier algorithms) even if you did stumble upon it. 3. Packet data.....think how the internet works...and if you dont know, all the content that you see on this page, including my post, has been sent in many small packets. Each packet has likely taken a slightly different route to your PC, and all the packets have arrived at slightly different times, not in sequence, and then re-assembled by your PC. This has many benefits, and I would imagine that advanced ET would possibly do something similar in nature. So even if you do pick up a noisey looking, digital, encrypted signal, you wouldnt have all of the message anyway.
4. Advanced ET probably wont use radio, either digital or analogue. Its too slow, especially if you are intergalactic species. I propose that they have found a way to take advantage of entaglement in quantum theory.
You mentioned that ET would use a technology based on quantummechanics... Why does SETI not understand that listening to analog signals will not help them in anyway. I mean, isn't it a simple conclusion to reach that ET would use something more exotic for communication than what "we" think is the intergalactic standard? And I was always assuming that there are bright scientist working at SETI
Originally posted by mysterioustranger
They could be millions of years ahead of us. You missed the obvious:: that they dont "use radio-waves" for communicating. Thats YOUR understanding and technology and very limited.
Youre assuming they have to communicate on our ancient level...but its all you have to compare to. Not your fault...but widely un-realistic.