Wikipedia There is more information available on this subject at Ganymede on the English Wikipedia.

Ganymede is a UNSC-controlled natural satellite and is the largest moon of Jupiter in the Sol system. It was partially terraformed though it supposedly retains a harsh climate.[2] Ganymede is home to a significant human population.

The country Aigburth is located on Ganymede, as well as the Low/Zero Gravity Testing Facility, the developer of the EVA Armor. Subsequently, the EVA Armor was created and tested at Ganymede at Lister, Aigburth.[3]