How can we detect parallel universes in M-theory?

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bondinthesand
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SOooo i finally understand (with in reason) M theory! but correct me if i am wrong, they say the universe (or multiverse) started because parallel universe collided and gave mass and such and formed our universe. But what i don't no is how can we tell the actually existence of parallel universes? or is it all theory?
 
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sort of obvious