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Why Understanding Space Is So Hard

nautil.us

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Re: Why Understanding Space Is So Hard

#10
post #6
post #5

I'm still wondering why space is 3-dimensional.

Doesn't need to be, but observations constrain extra spacial dimensions to be compact and under ~1mm in size.

How can a dimension be under a size? The four regular dimensions (3d and time) can go infinitely in any direction.
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