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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Where did you get the idea that the universe expanded from a single point? There is nothing in modern theoretical cosmology that says this.
The universe was simply denser as we go far back in time. It could always have been infinite in size. If you extrapolate back to t=0 (you never can in any known theoretical framework), then the physical distance between all points is zero, but at time t=0+epsilon, this isn’t true.
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