Simply orbitin
g (squaring with four planets) a dark matter black hole would send us back in time, but that presses us death against the wall from our spaceship, and different reacions may occur in dark matter zones.
Ghosts can’t go back in time, because the approach velocity of a dark matter hole would be faster than light.
I strongly advice that we stay in the Universe of course and overall avoid everthing what we can’t see, due to the possible different reactions of dark matter.