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P5, Pluto's fifth and most recently discovered moon

Image: NASA, ESA, and M. Showalter (SETI Institute)

This Hubble Space Telescope composite image shows five moons orbiting the distant, icy dwarf planet Pluto. Pluto and its bright inner moon, Charon, were observed with a short exposure, while the fainter, outer moons required a longer exposure time. The orange box points to the newly discovered moon, initially named P5. The moon is roughly 6 to 15 miles across. The images were taken on July 7, 2012, by the Wide Field Camera 3.

The Hubble observations will help scientists in their planning for the July 2015 flyby of Pluto by NASA's New Horizons spacecraft. Following that encounter, the spacecraft will study other objects in the Kuiper Belt.