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  1. Locations

Pluto-Charon System

System
Kuiper Belt in Outer Zone

Pluto-Charon is our solar system's only known double planetary system. The same surfaces of Charon and Pluto always face each other, a phenomenon called mutual tidal locking. Charon orbits Pluto every 6.4 Earth days.

Source: https://solarsystem.nasa.gov/moons/pluto-moons/charon/in-depth/