I’m going to try to make this make sense. We have understood what atoms and quarks are, and their relevant sizes to thinks like galaxies. We can only interpret the universe from our relative scale. So, theoretically, couldn’t galaxies function as quarks for some unfathomably large greater universe? Or couldn’t quarks function as stars in an unfathomably smaller scale? Is there any answer to this other than “We don’t know?”
Basically, is there any limit on size? Couldn’t you theoretically have an impossibly small universe condensed within an atom, with all internal objects scaling? So those in the universe would never know?
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Basic forces have distances they work at. The electrons can occupy some discrete fields in the shells of atoms for a reason. If you want to scale things down, you’d need to scale the forces that work. You basically need to change the fundamentals of nature to create a quark sized sun or a galaxy sized atom. The things interact how they do in the small scales because of the forces involved. If you try to enlarge let’s say an atom, the strong nuclear force will split the particles creating new pairs from the excess energy. So basically instead of growing, it will just multiply.