Io

Io is a moon of the planet Jupiter in the Sol System and a UNSC colony. It is the third largest Jovian moon.

History

Originally discovered in 1610 by Galileo Galilei, Io is the most geologically active object in the Solar System, with over 400 active volcanoes. Humanity began colonizing the Jovian Moons in 2080. In 2160, the Frieden first attacked the United Nations Colonial Advisers on Io, beginning the conflict which soon erupted into the Interplanetary War. Despite being massively volcanic and atmospherically volatile, Io supports a large colony of humans.

During the Human-Covenant War, The fleet of the High Prophet of Regret passed near Io where they were detected by Io Station, just minutes before the Battle of Earth, allowing UNSC forces to muster a timely response.

Trivia

• The moon was named after Io, a priestess in Greek mythology.