I'm sorry if this is a stupid question... but what on earth is the center of the universe? Must there even be such a concept? If the universe is truly infinite, I would think that implies it can be both expanding and centerless at the same time.
A circle has a center which is a point in that circle such that the distance(s) from the center to every point on the boundary of the circle is the same. The center is within the space of the circle but not on the boundary.
A sphere has a center which is in that sphere but not on the surface (boundary) of the sphere.
A 4-sphere has a center which is in that hypersphere but not in the volume boundary of the hypersphere.
...
It is entirely possible that the universe is a 3s1t shape which is part of the boundary of an NsNt shape, and there is a center to it which is not usefully accessible -- or even discoverable -- from anywhere in the universe.
