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Great like Tony the tiger or like the wall? Things are like ripples in a pond, so what if we are actually older and everything has passed us by and really this version of life in this epoch is not even the first wave of colonizers, but rather a follow-on accident. Not like radio communication is all that expected or interesting. Ordering the chaos and noise with wide-spectrum signals seems much more likely than a searchlight in the dark type of radio beacon blaring out. If even it is efficient to do that. Then again you got to wonder if at the height of technology if things aren't just reused over and over and over really efficiently and recycled, so there is really no reason to go hunting around other star systems for bonus matter, you just reuse it. Or you discard physical matter in most forms, managed evolution on into a more ephemeral energy based existence which requires a lower energy state than playing around with eating and consuming water and all these other rare exotic materials we need. Maybe the aurora borealis is both the message and the colonizers, maybe they are riding electromagnetic winds with consciousness and thought spread out over a vast scale spanning whole light years, electromagnetic memory, awareness and beingness with creatures like us being akin to a kidney stone, grumbling away in a locked in state of matter and run-down energy states.