From Halopedia, the Halo wiki
This article is about the moon. For other uses, see Callisto (disambiguation).
Callisto is a moon of Jupiter in the Sol system and a human colony. With little population to speak of, Callisto's purpose to the Unified Earth Government is primarily militaristic in nature; the moon's several UNSC bases are capable of launching their units and ships within an hour's notice.
Callisto was originally discovered by Galileo. Joint efforts by Earth's national governments to colonize Callisto, along with the other Jovian Moons, were underway by 2080. In 2170, Callisto was the site of the signing of the Callisto Treaty which officially ended the Interplanetary War. Callisto also eventually became the site of a UNSC naval depot.
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