Scientists have announced the discovery of a fourth moon in orbit around Pluto. Pluto’s first discovered moon, Charon, was found in 1978. Two more moons, Nyx and Hydra, were identified in 2005. The new moon, which is currently called P4, is believed to be between 13 and 34 km in diameter and orbits Pluto every 32 days at a distance of about 59,000 km, between the orbits of Nyx and Hydra.
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