The way I think I understand it, even if we had some “element 0” like in mass effect to keep a starship from reaching unmanageable mass while accelerating, faster than light travel still wouldn’t be possible because you’d be violating causality somehow, but every explanation I’ve read on why leaves me bamboozled.
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It’s often explained like a graph where on one axis you have space and the other is time. Any vector you take is a product of traveling through space and time. If you accelerated to the universal speed limit, then you would be on a line parallel to the space axis which means time isn’t changing. You can’t point any more in that direction so you can’t speed up.
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