Asteroid ships

Converted asteroids made of stone or metal are still sometimes retrofitted with nuclear-fusion engines, bridge, crew and cargo quarters, the ability to use Jumpgates, hangars for carrying smaller ships, and other stuff by all the major poliical powers except for Transformers and Dalek Empire for civilian or military purposes or both. Asteroid ships are often longer than Space cylinders and Bird-of-prey-class ships and sometimes as large as or larger than Imperial-class Star Cruisers.