Fourth moon discovered around Pluto

NASA’s Hubble Space Telescope has spied a previously unknown moon around Pluto, bringing the dwarf planet’s total number of natural satellites up to four.

Astronomers estimate that the tiny fourth moon is between 13 to 34 kilometers (8 and 21 miles) wide. By contrast, Pluto’s largest moon, Charon, is 1,043 kilometres (648 miles) across.

The dwarf planet’s other moons, Nix and Hydra, are both in the range of 32 to 113 kilometres (20 to 70 miles) wide.

The new moon has been given the temporary designation P4. Learn more here or here.

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