[Spaceships] Real Life Non-Super Science Reactionless Engines

[malloyd]

Originally Posted by Agemegos

Not a lightspeed signal. And if the FTL mechanism has properties that are not invariant between frames of reference it can work out that an FTL signal won't do it either. That's why you can choose "causality" and "FTL" out of the "causality, relativity, FTL: choose only two" trilemma.

Of course you can. You can select a preferred frame in which the physics are defined. That works fine, but you have to abandon the notion there is nothing but coincidence that's special about that frame.