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The scale is billions of years, not hundreds. The question posed is why, after 14 billion years of existence, don't we see anyone else? The star problem is still real in that time scale and requires constant expansion (or alternate power sources) to overcome.
I agree that the RF signature of civilization is in the noise but we broadcast signals to see if we're alone. Are we the only species that would do that, or have SETI-like receivers looking for it?
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