Why do we live in three dimensions?

New Scientist's MacGregor Campbell gives us the rundown on why – of all the dimensions – we live in the third one. What is the deal with space's essential... three-ness?

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Many of you – especially those familiar with books like Edwin Abbott's Flatland – will no doubt recognize the tautological silliness in explanations like "we evolved to live in a three dimensional universe, so that's the universe we perceive. If the universe had been two-dimensional then we would also be two-dimensional. Same with four dimensions." This explanation, as Campbell confesses, is kind of lame. Fortunately, he expands on the subject.

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For even more details, check out the newly published article by Matthew Chalmers that inspired the video (warning: paywall ahead).

[New Scientist]

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DISCUSSION

ellen-rose
Ellen-Rose

We live in four dimensions. We just experience one of them (time) differently. "Why" is a question for a philosopher or a theologian, not a physicist.

Physicists, now, their job is to find out how many dimensions there are, and whether any beyond the four we're used to are accessible to us.