1.618034 said:
Rome and China absolutely did know about each other. And all the other less well know empires in between. It's just that the great distances meant they were effectively talked about in legendary/mythical terms There is also evidence that there was communication between Egypt and South America.
Plus none of these civilisations would've (to the best of our knowledge) been sending EM waves into space, so anyone looking towards the Earth wouldn't have found anything beyond the normal sound of a rocky planet with an iron core that's covered in water... So in turn we're only looking for or rather are going to hear life capable of generating the energy required to produce EM noise. I would've thought that the generating/storage/transmission sources are those that will be stronger, steadier signals that have a chance of being heard above the noise of say, the latest episode of Corrie. I don't know but I'd guess we're just looking for the faintest pattern rather than any actual communication signal.
But that's where the clever bit is... In the deciphering. I don't think we're suddenly going to hear a Star Trek style message from the Clingons. Rather we'll suddenly interpret existing data differently using new techniques/mathematics.
All the above is just my opinion/view... based on moderate knowledge and research.
;-)
Ah, my history is not very good. But i wasn't suggesting that early civilizations where using EM waves as a mean to communicate with each other.
But i agree, we won't be hearing a Star Trek message, but the data we see, has to have an intelligent pattern. The thing is, their encoding methods to encode the massages might be way to complex for our understanding as of now. And in order for us to see any message they need to have been broadcasting for a long time. The lack of ET signals does not mean there are no other civilization out there. You are a maths man, and you know it's impossible for us to be alone. I am simply saying that Fermi Paradox is kind of wrong.