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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The universe isn’t flat. Galaxies are flat. If the universe was flat, you’d only see stars on the horizon. Just look outside at night and it’s obviously not flat.
A galaxy is flat because it’s spinning. Same with solar systems. They spin like a disk. That disk can be any angle though and there are other galaxies at completely different angles to our own. You can’t spin something in 3D. It needs a single axis of rotation. So you get a disk as things spread out. That’s just the nature of spin.
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