This article is from the Relativity and FTL Travel FAQ, by Jason W. Hinson jason@physicsguy.com with numerous contributions by others.
To sum up, we have found that by introducing a special frame of
reference which would be "attached" to subspace, and by further insisting
that any type of FTL/time travel done without using subspace be governed by
the "parallel universe" or "consistency protection" provisions, we will not
only have a self consistent universe for our Star Trek stories, but we can
also (coincidentally) explain many of the "but how come...?" questions which
some Star Trek episodes produce.
 
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