Final answer:
A closed universe cannot have a center because every point in it is equal in terms of its distance to other points. In physics, a closed universe refers to a finite universe without any boundaries or edges, where space is curved in on itself, much like the surface of a sphere.
Step-by-step explanation:
In physics, a closed universe refers to a universe that is finite in size, without any boundaries or edges. The reason a closed universe cannot have a center is due to the shape of space-time within it. In a closed universe, space is curved in on itself, much like the surface of a sphere.
On a sphere, there is no single point that can be considered the center. Similarly, in a closed universe, there is no specific point that can be identified as the center because every point in the universe is equal in terms of its distance to other points. This is because space is curved in such a way that it is finite but without any edges or boundaries.
So, in a closed universe, there is no need for a center, as every point is equivalent and there are no preferred locations within the universe.
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