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Black Holes
A Black Hole is a collapsed star. Black Hole systems are rare, but can pose significant dangers or at least obstacles to spaceship traffic, because they tend to swallow ships.
Black Holes are rated from I to III, according to their gravity. A Class III black hole pulls every object (ship, missile, etc.) towards itself with a constant speed of 2,500 km/s (yes, it's simplified physics). That is offset by the ship's own speed, so a ship with a max. speed of 4,000 km/s could travel anywhere in the system, but only with a speed of 1,500 km/s.
If the pull of the black hole is greater than the ship's speed, then the ship's speed becomes negative and it is slowly pulled into the singularity's event horizon, which is a fancy way of saying it is gobbled up.