Why would it only expand in one plane not every direction like you’d expect?
Also how is a flat universe even possible? Surely since we live in 3 dimensions the universe needs to be a 3 dimensional shape.
Im probably misunderstanding what physicists are trying to say but that’s why im here.
In: 229
It is assumed to be flat in the fourth dimension but it is round in the third dimension as you would imagine from a point expanding equally in all directions.
Flat in 4d means it will expand endlessly in all directions until everything is very far apart, this is because there is slightly more pushy out force than sucky in force. If the universe were round in 4d there would be more sucky in force so it would eventually shrink again
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