Scientists found carbon dioxide and hydrogen peroxide on Pluto's largest moon, Charon. Charon is half the size of Pluto, measuring 1,214 km across, discovered in 1978. It's named after the ferryman of dead souls in Greek mythology. Charon’s mass is over one-tenth of Pluto’s, and the two form a double dwarf planet system. The distance between Pluto and Charon is 19,640 km. Both bodies are tidally locked, always facing each other in same side. Charon completes one orbit of Pluto in 6.4 Earth days.
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