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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What they mean is if you would walk in 1 direction around the Earth you you would eventually end up in the same spot, the Earth is curved.
If you were were to walk, or float along space forever you would never end up in the same place if space is flat. That raises the question of how could space be curved? Well that’s a more complicated question that gets into very complicated physics and ideas
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