
Pluto’s largest moon discovered
June 22, 1978: Charon, Pluto’s largest moon, was discovered by James W. Christy and Robert S. Harrington at the U.S. Naval Observatory station in Flagstaff, Arizona. The moon has a diameter of 1,208 km (751 miles) and over one-tenth the mass of Pluto. It is named after the ferryman of…