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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>If the universe expanded from a single point
That was one hypothesis that gained a lot of steam before being proven false. I’m not up-to-date on the latest theoretical physics, but last I heard the best hypothesis is that it started expanding from everywhere all at once.
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