- In Super Melee, the gravitational pull exerted by the planet, often used by battling starships to accelerate into a gravity whip. Starting from the planet's surface, it extends across three times the planet's diameter. Ships within a gravity well can accelerate up to a higher maximum speed than normal. The gravity well also serves as a hazard for slow or unwary captains, as it slowly pulls ships within straight into the planet.
- In HyperSpace, an opening in the fabric of HyperSpace, either around a star or a ship traveling in HyperSpace, that can pull a HyperSpace traveler back into TrueSpace.
- In TrueSpace, a distortion of space-time caused by a quantity of matter.