Eli5 If the universe expanded from a single point why do scientists say its flat and not spherical?

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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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Anonymous 0 Comments

You need to distinguish between the observable universe and the whole universe. Yes the observable universe was a lot smaller but that is just our section of it. The rest of the universe was also part of this process and is not part of that bit we are talking about. So for the whole universe you are not talking about a point, you are possibly talking about something infinite in extent. When the big bang happened it didn’t happen at a point, it happened everywhere in every bit of the universe both in our shrunk down observable section and all the rest too. It is not an explosion from a point, it is all the the points in the early universe all expanded at every point. The place we in now? That expanded. Alpha Centauri? It expanded there too. Everything everywhere expanded, including the parts of the universe we cannot see. At its earliest point there is a singularity and we cannot tell what was going on there but after we have some theories, and every point that existed in the entire universe all expanded.

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