A Space Colony works like a city, but it exists in Earth's orbit. Only Space Engineers can build Space Colonies. These orbital cities cannot build Airports or any pre-Modern Age improvements. Only Marines, Storm Marines and Swarm can unload into a Space Colony guarded by enemy units.
The tile beneath a sea colony produces resources for free, gives +30 food and +5 production.
Great Library entry[]
Space cities trace their roots to the primitive 20th century space stations of MIR and Skylab. Building on the knowledge gleaned in the first centuries of space exploration, in the 22nd century, scientists used the newly created Advanced Composites to create lighter, stronger, and more powerful space stations. Not only did these dramatically lower launch costs, but they also enabled scientists to create permanent vast metropolises in space. Lastly, the Space Engineer, a masterpiece of robotic engineering allowed for the construction of the first space cities.