The real question is how we'd know about the physics of the parent universe. I think this short story is interesting to think about in that way: https://www.l

The real question is how we'd know about the physics of the parent universe. I think this short story is interesting to think about in that way: https://www.lesswrong.com/posts/5wMcKNAwB6X4mp9og/that-alien-message https://www.lesswrong.com/posts/5wMcKNAwB6X4mp9og/that-alien...