Luna is the moon of Earth.
The moon was first settled in 2063, eleven years following the flight of the Ascension. Its first settlement, known as Armstrong City, was first established as a mining colony for minerals and gases. Over time, several families had begun moving to Luna, turning Armstrong City into a large civilian colony. As more people had begun to moving to the moon, a new city, known as Grissom City had begun to be constructed in 2075.