I am wondering how there isn’t a centre of the universe and how the cosmic background radiation is [equally] far away everywhere we look. It seems to me that when the universe expands … there should be a place where it started expanding
Ask Ethan: Is there a center of the Universe?
Ethan Siegel
21518

A better answer comes from thinking in the universe as the surface of a sphere. It expands in every direction, and there is no center. Or, any point of the surface can be a center, as well as any other. This is a metaphor for a 2D universe, then extrapolate to a 3D universe.

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