Styx
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Styx is a small moon that orbits the dwarf planet Pluto. It matters because it helps scientists understand the Pluto system and provides clues about the composition and history of objects in the distant outer regions of our solar system.
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Styx, formal designation (134340) Pluto V, is a small natural satellite of Pluto whose discovery was announced on 11 July 2012. It was discovered by use of the Hubble Space Telescope, and is the smallest of the five known moons of Pluto. It was imaged along with Pluto and Pluto's other moons by the New Horizons spacecraft in July 2015, albeit poorly with only a single image of Styx obtained.
Styx is the second-closest known satellite to Pluto, and the fifth discovered. It was discovered one year after Kerberos. Styx is approximately 16 km (9.9 mi) across its longest dimension, and its orbital period is 20.1 days.