Mars

Mars, also commonly known as Sol IV and as the Red Planet, was the fourth planet of the Sol system and the second-smallest planet in the system.

The first planet besides Earth to carry Human populations, Mars was first colonized by Humans in the mid-twenty-first century, and by the mid-twenty-fourth century carried a population of approximately 3.6 billion permanent residents. Mars had a remarkable amount of autonomy within both the United Nations and Terran Mandate, with Mars becoming a sovereign member of the UN in 2155.