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Pluto’s smallest moons now get official names

The two smallest known moons orbiting Pluto have been officially christened by the International Astronomical Union, which is in charge of approving celestial names.

American non-profit science research group SETI Institute said the moon earlier known as P4, which was discovered in the summer of 2011, has been named Kerberos, after the three-headed dog of Greek mythology.

The second one called P5, which was discovered in the summer of 2012, has been named Styx, after the mythological river that separates the world of the living from the realm of the dead, Xinhua reported. The moons join Pluto’s previously known moons Charon, Nix and Hydra.

The SETI Institute said Pluto’s moons are all named for characters associated with the underworld of Greek and Roman mythology, according to the International Astronomical Union rules.

The two names were selected based on the results of an unprecedented internet vote that was held during February 2013, with the ballot receiving almost 500,000 votes, including 30,000 write-in suggestions, the institute said.
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