
Pluto's giant companion, half as wide as Pluto itself. The two are locked face to face: from one side of Pluto, Charon hangs motionless in the sky, never rising or setting. Its north pole wears a strange reddish cap, nicknamed Mordor, made of material that escaped from Pluto and froze there. Some call Pluto and Charon a double world rather than a planet and moon.
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