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.
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Think of the universe like an infinite rubber sheet.
This sheet can have an overall bent in 3 broad ways.
It can be bent downwards like it’s on the outside of a ball. It can be bent upwards like it’s at insides of a ball.
Or it can be perfectly flat.
This isnt my best work but am literally falling asleep so. Might update later
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