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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It’s “flat” respective to how things travel through it. What scientists do is shoot incredibly precise lasers into space and watch how they travel. In a “flat” universe they should travel perfectly straight forever. If the universe had positive curvature, the lasers would eventually overlap. If the universe had negative curvature, they would separate from each other more and more.
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