If so, do we know where is the middle of the universe?
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There is no middle as far as we can tell.
When expansion of the universe is discussed you probably imagine a balloon that is being inflated getting bigger, right? But as far as we can tell there is no edge, like the surface of the balloon.
Instead think of an infinite mass of bread dough which is rising and therefore expanding in all dimensions.
We can talk about the size of the “observable universe” which has to do with fire much we can see sure to the store if light but don’t confuse that with the actual universe.
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