Astronomers have discovered a fourth moon orbiting the icy dwarf planet Pluto, the NASA has announced.
P4 was first seen in a photo taken with Hubble’s Wide Field Camera 3 June 28. It was confirmed in subsequent Hubble pictures taken July 3 and July 18.
It is the smallest moon discovered orbiting Pluto. It has an estimated diameter of 13 to 34 km. By comparison, Charon — Pluto’s largest moon — is 1,043 km across, and the other moons, Nix and Hydra, are in the range of 32 to 113 km in diameter.
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