Moon

The Moon, also known as Lua, Tsuki, and Luna is the Earth's moon and the setting of most of Spark the Electric Jester and Spark the Electric Jester 2.

Background
Originally, Formies were going to call the moon Luna, after the Luna Base in Mare Desert. However, they found records from old civilizations of different names for the planet and decided to use all of them. Because of this, the name of Spark's planet isn't mentioned often, as there are simply too many names to list.

After some unknown crisis forced the Formies off their homeworld, some Formies found the Moon after migrating from their home planet 300 years before the events of Spark the Electric Jester. They did extensive research on the Moon and its solar system trying to find a reason the former inhabitants left before they finally decided to settle on one planet completely devoid of life. Eventually, other planets were colonized as the population grew over hundreds of years.

The Moon was largely terraformed by two companies, Megadre and Tera.inc, who made sure the gravity, atmosphere and other qualities were perfect for Formies. Tera.inc was in charge of the terraforming process, while Megadre was in charge of making the giant ring around the planet that controls the climate.