Mass Effect - Citadel
Supposedly constructed by the long-extinct Protheans, this colossal deep-space station serves as the capital of the Citadel Council.
Gravity is simulated through rotation, and is a comfortable 1.02 standard G’s on the Wards and a light 0.3 standard G’s on the Presidium Ring.
Total Length (Open): 44.7 km
Diameter (Open): 12.8 km
Population: 13.2 million (not including keepers)
Gross Weight: 7.11 billion metric tons