Io is one of the moons of Jupiter and the fourth largest moon in the Sol system, almost as large as Luna. It is the innermost of the "Galilean moons", the main group of Jupiter's moons that was discovered first.
Io houses research labs and supplies power cells to the Belt.
History
Ganymede Incident
 “We are not alone” — Spoilers for Caliban's War follow.
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Some time after the knowledge of the protomolecule was public, Mao-Kwikowski Mercantile and a covert branch of the United Nations began their secret research on how to use the alien virus to create human-protomolecule hybrid super soldiers. They kidnapped several children with the systemic autoimmune disorder Myers-Skelton Premature Immunosenescence, who it was easier to control the infection of, and brought them to their labs on Io.
Trivia
- Io was a maiden loved by Zeus and transformed by him into a heifer so that she might escape the jealous rage of Hera.