Eli5 Why is said that the universe has no center or that any point in it is the center?
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You might think of the universe as a 3D ball. It’ll look like that from our point of view, because we have three space directions to look in. Were at the centre of that visible ball, by definition, because we see equal distance in all directions.
But the universe isn’t 3D. It’s 4D. SpaceTIME. So the 3D space we see is to the universe like the surface is to the earth.
Imagine a map of the earth, especially an interactive one like google maps or something. There is no center to that map, you can shift it any way you want, except for the “center” of the screen you’re looking at. But it’s only the “center” because that’s where you’re currently looking. Again, you can shift the center of the view anywhere, no point on the map is special.
It’s the same for the universe, but with one more dimension, so we can’t really visualise it. But the principle is the same.
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