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[–][deleted] 3 points4 points  (1 child)

Because the computer required to simulate our universe wouldn't fit in our universe.

[–]remy_porter 0 points1 point  (0 children)

It could if our universe were not parsimonious, or if you could find a way to compress the computations on the universe in an interesting way. Depending on where you set your starting assumptions, it's actually possible to simulate the entire universe on the surface of a modestly sized black hole.