Some physicists are convinced that the “arrow” of time is determined by the rule that entropy has to increase or that the direction of time is the same thing as the direction of increased entropy. But if that’s true, what happens when the universe reaches maximum entropy? In such a universe, everything will be in equilibrium and no order can be created. Will time stop at that point or have no meaning? Some philosophers speculate that at this moment the arrow of time and the law of increasing entropy could reverse themselves, leading the universe to shrink back to a tiny singularity. But this
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