Module

Modules are the basic unit of an outpost. They differ from ships in that they are stationary objects, can shoot in any direction and cannot move. They are also immune to the effects of Nebula Fields.

When destroyed, they cause Collateral Damage which damages other nearby modules, but not ships.

Size
Modules come in three grid sizes: 1x1km, 1x2km and 2x2km. Unless destroyed, ships cannot move through most modules - however, the collision boxes of most modules is considerably smaller than the grid size.

Trivia

 * Since the mid-January 2020 update, undestroyed modules have collision boxes which can interact with ships.