On Earth, the cardinal directions are straightforward. The arrow on a compass points to the nearest magnetic pole. You can then use it to travel anywhere on Earth.
In space, the idea of anything being “central” enough to be used as a “North” (since the universe has no center) or being fixated enough to not somehow pose issues is more convoluted.
If you were a pioneer of space exploration, what would your “North” be?
I used to think FTL was nonsense, but it turns out the universe has a built-in mechanism for time travel at the Planck scale. Particles smaller than the atom swing both ways when it comes to causality and retrocausality.
Now I think that either FTL is completely impossible at the macro scale or it’ll be so easy we’ll be embarrassed we didn’t have it sooner.