All the science stuff says the universe is expanding at an ever increasing rate. However, when reading about the possibilities of creating micro-universes (like in colliders), they say that those universes would appear to decay quickly from our outside perspective. Wouldn’t it make more sense that our universe is a micro-universe, which ought to be common for the same reason simulates universes are common, and that it’s decaying? What’s the difference between space expanding and the stuff within space all shrinking? Would the distinction even matter from an “inside” perspective?
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It’s not that we see it getting smaller, it’s that the light the stuff emits is getting *redshifted*
It’s similar to how a siren from an ambulance sounds lower pitched as it moves away from you as opposed to moving towards you. Light emitted from things moving away from us is shifted to longer wavelengths/lower frequencies. Almost everything out of our near galactic neighborhood has had the light they emit shifted to this lower frequency, meeting theyre moving away from us, and the distance they’re moving away is directly related to how fast they’re moving.
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