Charon is the largest moon of Pluto. In 2131, Pathfinder Tsiolkovsky confirmed the presence of a non-human structure in Charon orbit — a gravitational-calibration object that had been the source of instrument anomalies reported by independent explorers since the early 2120s. Debris fields in the Pluto system, consistent with destroyed alien vessels, comprise the moons Styx and Kerberos. The Charon structure, along with a subsurface facility and a downed alien spacecraft on Pluto’s surface, represents the first confirmed non-human artifact in the solar system. The site has been placed under permanent UN restriction.