Is there a center in the universe around which everything revolves?

Answer

The universe has no center around which everything revolves. Also the big bang was not an explosion in an already existing empty space, but an event in which space, time, energy and matter were formed.
Hard to imagine, but a parallel nonetheless : Suppose for a moment that people can only perceive in a horizontal direction, so they have absolutely no idea of ​​up and down, they live in a 2-dim world, the Earth’s SURFACE, in which they can only reason in terms of forward/backward and left/right. In their environment, their universe, the SURFACE of the earth, there is not a single point that can serve as the center of the rest. Every point would qualify for this with the same amount of right, and therefore with just as little right, namely none.
You could now imagine that an unearthly being is slowly blowing up the world, causing the surface to become larger and larger. Our 2-dimensional beings would then see their universe expand. Two people, both standing still, would still see each other slowly moving apart, not because they are moving but because the space between them is stretching. And someone who is twice farther will also slide away at twice the speed. From anywhere you would see the same thing: everyone else is moving away slowly, at a speed proportional to their distance. Any person could say “hey, I happen to be in the middle of all this happening”, but since everyone could say this with as many, or better said with as few arguments, would there be no center to this 2-dimensional universe? to be.