Say scope all you want. Radio waves are detectable like light from stars. There's not one alien civilization that wants to be detectable and is. There's not one that can overcome "scope". The vast distances don't explain it away. It explains the non-detection of life that either can't send signals or doesn't want to but it doesn't allow for those who can and do. We know for sure that there's no alien civilization with the desire and ability to communicate with us. That's what silence means. If life is able to technologically surpass where we're at now, by great measure even, it stands to reason that in at least one case there would be something we could detect but there isn't. If scope is the problem then the lack of technology to overcome it, even with the limitation of light speed, is also the problem. And that reinforces the theory that there's a certain technological threshold that always causes self-destruction.
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