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The universe seen from the outside would be a single object.
I agree theres various ways of setting the parameters for big and small, but I still found the way we did it quite an interesting exercise. If I had gone on gut before your calculation I would have assumed we were no where near the middle when compared with the planck length and the Universe.
Well done for your planck length vs universe size calculation, I would'nt have known how to work that out. Only thing is, you've used the radius of the universe (from us to the edge of the observable universe), when the size of the whole universe is double that (the diameter). Probably doesn't make much difference to the final result though.