What are UFO's and what ties them to Extraterrestrial Life
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source, but so far with no success. Radio signals do seem a logical way to send messages over big astronomical distances, but an alien society with a lot more advantage in technology could be using something very different. With thousands years advantage, they may have technology beyond our comprehension It is possible that when they had radio signals, if they ever used them, we had no radio receivers and their information could not reach us.
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