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Is the universe 2D or 3D?

Answer 1

Asher Cohen

It is at least 4D.

Since we live in a three-dimensional world, the universe must have at least three dimensions.

According to Einstein's General Theory of Relativity, space-time in the universe has four dimensions.

If String Theory is right, there could be up to 26 dimensions in the universe.

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Answer 2

Josiah Adams

Though some theoretical physicists propose models in which the universe could have more than three dimensions—such as the ten or eleven dimensions of string theory—the universe is generally thought to be three-dimensional, consisting of length, width, and height.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.