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.
Does The Universe Have A Shape?
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Key Facts In This Video
There are three main proposed models for the shape of the universe: positively curved, negatively curved, and flat. 01:22
A negatively curved universe would look like a four-dimensional saddle, and would contain too little energy to ever stop expanding. 02:56
One negatively curved model of the universe resembles a trumpet. 04:26