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While our own feeble signal has only been moving outwards for 200 years or so, the rest of the universe has been 'out there' for 13.7 Billion years - or wharever the current received wisdom is - so while nobody has had much of a chance of hearing us, there is every reason to believe that we ought to be hearing them - if they are being broadcast in any medium or band within our techincal competence.
Peter
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