Curious how they even know which direction would be the center of the universe?
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There is technically is no “center” to the universe as by definition, the universe is everything. Some think that if you traveled far enough out in a straight line, you’d eventually end up back where you started. It’s the 4-dimensional equivalent of a 2-dimensional object moving on the surface of a 3-dimensional sphere. No matter what direction the 2-dimensional object travels, it winds up back where it started.
I’ve heard otherwise. I’ve heard there is a center and everything is traveling further away from it. So I’m guessing they look at what direction our galaxy is moving relative to others and “plot the center”. But to me that is one big assumption.