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UFO Sightings
I don't think physics is very different on the other side of the galaxy. I would suspect that they have, if they're in our universe, they have the same physics. And there could be like super trippy things like, like all the possible instruments that we can design only get to a particular slice of the universe. Maybe we can try a thought experiment. Would people from the past be able to detect the remnants of our modern civilization? Well, let's even go back further. Let's go to a million years ago. The humans who were lying around in the desert probably didn't even have, maybe they just barely had fire.