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Nueva Castilla is an exoplanet in the Culebre system, currently in the late stages of terraforming. Formerly a barren rock, it was chosen for colonization by the Sol Central Government because of its size, core composition and location in the Culebre system's “goldilocks zone”. Since the project began, Nueva Castilla has developed a functional, if decidedly unique biosphere where much of the planet is covered in a fast growing moss. Recently, the atmosphere was even classified as breathable for those adapted to low-oxygen environments. There are two major human settlements, and a number of smaller ones both planetside and in-system.