Sol I — Mercury
UNHRocky
Tidally locked, with extreme surface temperatures. Automated mining operations extract rare metals. No permanent human habitation.
Humanity's origin system and the political, economic and cultural centre of human civilisation. Earth is home to roughly 150 million families, the wealthiest population in human history, while Mars hosts the largest urban concentration outside Earth. UN authority here is absolute and no private military operations are permitted; the Dyson Swarm provides effectively unlimited energy.
Rocky
Tidally locked, with extreme surface temperatures. Automated mining operations extract rare metals. No permanent human habitation.
Rocky (greenhouse)
Crushing atmosphere, surface temperature exceeding 450°C. Only high-altitude research stations exist; surface operations require Salus armour at minimum.
Temperate terrestrial
Homeworld, recovered from the Collapse over centuries. Roughly 150 million families occupy private estates averaging a square kilometre each, the entire habitable surface divided among the wealthiest population in human history. Cities exist only as administrative centres.
Rocky (airless)
Earth's moon, extensively developed since the First Exodus. Over three billion live in arcologies and subsurface warrens, running the heavy industry and services Earth's estate owners prefer not to see.
Cold terrestrial
Fully terraformed over eight centuries, now breathable with open water. A population exceeding fifteen billion is concentrated in arcologies and industrial zones. Olympus Mons Arcology is the largest single structure in human space.
Debris field
Extensive mining operations. Ceres hosts the Belt's largest settlement, with thousands of smaller habitats scattered throughout.
Gas giant
Massive gas giant. Ganymede houses over a billion in domed cities, and Europa's population approaches 500 million around its subsurface ocean. Atmospheric volatile harvesting feeds Sol's energy and chemical industries.
Gas giant
Gas giant with an extensive ring system. Titan hosts over 500 million in domed settlements, the largest population in the outer system. Volatile harvesting from atmosphere and rings supplies fuel and chemicals across Sol.
Ice giant
Distant ice giant. Minimal development, automated fuel harvesting.
Ice giant
Outermost major planet. Automated operations only.
Debris field
Outer system debris. Scattered outposts at the edge of the system.