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superstring theory comparison table

Subject	has definition
heterotic string theory	Gross's version of string theory in which space-times of different dimensions are associated with the same closed loop.
M-Theory	Theory emerging from the second superstring revolution that unites the previous five superstring theories within a single overarching framework. M-theory appears to be a theory involving eleven spacetime dimensions, although many of its detailed properties have yet to be understood.
type I string theory	One of the five superstring theories; involves both open and closed strings.
type IIA string theory	One of the five superstring theories; involves closed strings with left-right symmetric vibrational patterns.
type IIB string theory	One of the five superstring theories; involves closed strings with left-right asymmetric vibrational patterns.

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