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string theory posits 10 dimensional spacetime, 9 physical and 1 time, the 9 physical ones are the 3 we are familiar w/ and 6 curled up ones that are needed for consistency w/ the reality we observe unfortunately there are 5 viable versions of string theory.
all 5 can be contained in an 11 dimensional mathematical construct called M Theory
one of the really fascinating things explained w/ all these extra dimensions is the conundrum of the disparity of the strengths of the 4 fundamental forces,
gravity @ 10-64 of the strength of the E-M force is a real outlier.
one of modern Physics main goals is a Theory that unifies all 4 fundamental forces into 1
Electro-magnetic and Weak have been successfully unified, M Theory looks to be one of the better theories to unify the Strong and Gravity w/ Electro Weak forces
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