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Where is the "center"? Imagine the hull of a rubber balloon. Every point on that hull moves away from every other point when the balloon inflates. Yet there is no "center point" on the hull - all points are equal. It's the same way in the universe, just in three dimensions. Its a consequence of general relativity theory that the universe doesn't have a center or a border.

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Thanks for the clear explanation, makes sense. Will have to check out that link you provided.