At the same time, most of the modern Grand unification theories such as M-theory predict no magnetic monopoles, which casts doubt on this attractive idea.
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Recently Friedwardt Winterberg has suggested a means of converting an imploding matter-antimatter plasma into a highly collimated beam of gamma-rays - effectively a gamma-ray laser - which would very efficiently transfer thrust to the space vehicle's structure via a variant of the Mössbauer effect.
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Faster than light travel is impossible, and the result of more mundane interstellar travel between the eighty worlds of the empire results in relativistic effects due to the high speeds involved; as such, the ages of space travelers become out of sync with those of their friends and family, an effect known as the "Time Thief".