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Possible Duplicate:
Measuring extra-dimensions

I was watching a layman's documentary and it said:

"The 11th dimension is incredibly small, like a long tube about $10^-30m$ in diameter".

How can we know the general sizes of extra dimensions?

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  • $\begingroup$ Note that $10^{-30}$ m is smaller than ay tool we currently use can measure. $\endgroup$ Commented Jun 1, 2012 at 12:49
  • $\begingroup$ I know, so how can we know the sizes of these dimensions? Given that we can't see them $\endgroup$
    – ODP
    Commented Jun 2, 2012 at 15:44
  • $\begingroup$ @ODP: 11 dimention is just the theory no one has yet proved it, hence noone ever measured it $\endgroup$
    – Xinus
    Commented Apr 23, 2017 at 11:03

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