In The GEM (Brandenburg, 2006) theory, direct manipulation of space-time geometry is possible leading to the possibility of transformation of a starship into a tachyon moving Faster Than Light (FTL). The GEM theory is reviewed and Causality in terms of the time ordering of experienced events is considered as well as examining the space-time curvature signature of such FTL particles. Time ordering and time flow is found to be determined by the 2~(nd) law of thermodynamics and is used to derive a Cosmic time flow in terms of the expansion of the universe. The rate of increase of cosmic entropy is approximately dS/dt = c~3/(Gm_p), the rate that light transits from a proton-mass Black Hole, reminiscent of the Dirac Larger Number Hypothesis relating Cosmic and subatomic quantities. It is found that the tachyon FTL method, rather than allowing reversal of time ordering of experienced events, actually makes the cosmos age faster by contributing to an increase in "Dark Energy" and thus FTL travel via tachyons irreversibly changes the cosmos. Therefore, it appears that FTL travel can be accomplished without violation of Causality.
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