Image via WikipediaNASA's Hubble Discovers Another Moon Around Pluto: "
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These two images, taken about a week apart by NASA's Hubble Space
Telescope, show four moons orbiting the distant, icy dwarf planet Pluto. The
green circle in both snapshots marks the newly discovered moon, temporarily
dubbed P4, found by Hubble in June. P4 is the smallest moon yet found around
Pluto, with an estimated diameter of 8 to 21 miles (13 to 34 km). By comparison,
Pluto's largest moon Charon is 746 miles (1,200 km) across. Nix and Hydra are
20 to 70 miles (32 to 113 km) wide. The new moon lies between the orbits of Nix
and Hydra, two satellites discovered by Hubble in 2005. P4 completes an orbit
around Pluto roughly every 31 days.
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