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urzu_seven t1_iyd39se wrote

Reply to comment by WinBarr86 in ELI5: How is that space is “flat” yet we are able to look around the universe (up, down, left, right, etc.,) as if it were not flat? by nhabz

That is not at all why the geometry of the universe is described as flat. It has nothing to do with “thickness”

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WinBarr86 t1_iyd5s0i wrote

I'm trying to keep it simple. But plz do explain. Without explaining like your talking to a scientist who knows alot of the concepts of space/time.

Edit.

But we both know space isn't flat.

Spacetime is not flat. It can't be: Einstein's general theory of relativity says that matter and energy curve spacetime, and there are enough matter and energy lying around to provide for curvature.

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WinBarr86 t1_iydcvxm wrote

Trying to explain the concept of flat as to curved without using mathematical terms is hard. Flat is a concept, just means non curved. To explain in detail requires a fair bit of knowledge of things like diffent types of geometry and understanding fundamentals of curvatures and Euclidean geometry. Best way to explain flat is paper.

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