A researcher suggests that the “techno signature” of the trash might be a discarded reflective surface, rotating:
If only a few hundred mirrors were present, a much smaller telescope could spot one. But the fact that we haven’t seen such flashes yet suggests any alien visitors—if they are out there—are doing a good job of cleaning up after themselves. Daniel Clery, “If an alien ship left its trash near Earth, here’s what it might look like” at Science
Paper. (open access)
We invent explanations for not seeing the trash, quite apart from the fact that we have never seen the aliens. There, you stupid peasant, that’s real science thinking for you.
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See also: Our superiors explain why “people” believe in pseudoscience Elite reasoning is interesting. People who see no evidence for design in nature are quite prepared to believe that interstellar object Oumuamua is an alien spacecraft and that an evidence-free multiverse must really exist. And no evidence for fine-tuning of our universe for life is really evidence.