Also known as Plutonian objects, these tiny worlds are composed primarily of ice and rock and are generally not considered true planets. Many moons and asteroids are considered Class D, as are the larger objects in a star system's Kuiper Belt. Most are not suitable for humanoid life.
- Extreme attrition damage to units outside Pressure Domed facilities due to no atmosphere.
- No Water for Naval Units
- No Water for Fishery or Waterport
- No Atmosphere For Air Units or Airport
- Facilities can not function here unless they have the Pressure Dome Upgrade, or suffer damage.
- No Weather events.