If aliens existed we could readily see copious surface engineering in galaxies: "The germs of existence [on] earth if they could freely develop themselves would fill millions of worlds in the course of a few thousand years"(Malthus) https://waitbutwhy.com/2014/05/fermi-paradox.html … https://www.centauri-dreams.org/2012/01/23/rethinking-setis-targets/comment-page-1/ …
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Quantum physics is universal, so we can expect physics-based fundamentals of surface engineering to be universal. However alien, engineered surfaces look radically different from natural. If aliens are at all common at least some aren't trying to hide like elves and hobbits.
i.e. if you have to posit that all advanced alien civs (and almost all will 100s of millions to billions of years more advanced than us) are hiding like elves and dwarves, that's basically an admission that they are mythological.
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but what if advanced aliens didn’t simulate themselves in this simulation?
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