Luna

Luna is the only natural satellite of Earth and the first body to be colonized by spacefaring Humanity. First visited in the 20th century and colonized in the 21st, Luna played a key role in Humanity's early expansion throughout the Sol system. "The moon is halfway to anywhere" as one 20th century writer put it, and settlers passed through it on their way to Mars and the Jovians.

History
Luna had its first permanent outposts set up in the early 21st century. As the Golden Age of Space Colonization began, a lucrative shipbuilding and orbital infrastructure industry quickly developed on Luna due to its low gravity, lack of atmosphere and proximity to Earth. Much of the orbital infrastructure that enabled a permanent human presence in space as well as travel further out into the system was constructed from Lunar raw materials. This inspired thousands of artists and writers, giving rise to the Selenist movement which characterized the various creative arts of that era. Even in the centuries to come, Luna remained a trafficked stopover between Earth, the rest of the Sol system, as well as the extrasolar colonies of the Human Sphere, always retaining a large transitory population in addition to its permanent one.

Governance and politics
Early on, Luna was a patchwork of numerous national, transnational, corporate and independent holdings and land claims, even more so than Mars. The advent of the UEG simplified these relationships somewhat though much of the underlying complexity remained.