Multiple string theories developed with different models for how strings are constructed. M-theory seeks to unify these various forms. It describes the string as a one-dimensional slice of a two-dimensional membrane vibrating in eleven dimensions. The theory attempts to explain the universe as undergoing multiple incarnations when two parallel membranes within a ten-dimension universe that are separated by the seventh rolled-up dimension (eleventh overall dimension). These membranes periodically collide and generate another Big Bang. Multiple cycles of incarnation are thus generated as these membranes move apart and come together.

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