Does The Universe Have A Shape?

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Scientists have proposed many models to sum up the shape of the universe, though it's difficult to represent something that's both infinitely vast and (at least) four-dimensional. The three types of universe shapes that are commonly discussed are positively curved, negatively curved, and flat. As of 2015, evidence points to a flat universe over the other two models.

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Key Facts In This Video

  1. There are three main proposed models for the shape of the universe: positively curved, negatively curved, and flat. 01:22

  2. A negatively curved universe would look like a four-dimensional saddle, and would contain too little energy to ever stop expanding. 02:56

  3. One negatively curved model of the universe resembles a trumpet. 04:26

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