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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Space and time are actually the same thing. Stuff curves space-time in such a way that objects that normally move in a straight line move towards one another. The bigger the object, the more it distorts spacetime and the more it changes the paths of objects moving through spacetime.
But what does spacetime look like when there are no objects nearby? Does that mean there is no curvature? If there isn’t then we say space is flat. If spacetime is curved without any objects then it depends on whether the curvature is like an innie bellybutton or an outie.
We know that the universe is expanding and one explanation for that is that the curvature is like an outie when there are no objects nearby. If the curvature is an outie or flat, then the universe will expand forever. If the curvature is the other way, then the universe will stop expanding one day and gravity will take over causing the objects in the universe to move towards one another until they are in a single point again.
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