Quote DoctorOfSpace (
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There are only 3 types that one could bring up under hypothetical situations. I don't know of any others that could apply or have any physics to actually describe them.
1. Wormhole.
Time is relative to departure location and only varies depending on ship velocity relative to c.
2. Warp drive.
Time is relative to departure location and only varies depending on ship's velocity relative to c inside the bubble.
3. True FTL.
Ship somehow achieves negative mass just as the effect of space is reversed the effect on time is reversed, ship is now moving backwards in time.
The first can be utilized to achieve the third in a way that is possible, but I guess it's still considered wormhole travel.
I can post the assumption here if you are willing to nitpick it.
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