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Competition to name Pluto's moons launched

Astronomers have launched a competition to name Pluto's two tiniest moons. The moons, discovered over the past two years, are currently known as P4 and P5.

Pluto, centre and it's previously known moon Charon, below Pluto and right of centre, shine brightly. Two new moons are beside it. Credit: NASA

Three of the moons already have names associated with Hades and the underworld. They are Charon, the ferryman of Hades, as well as Nix, the night goddess and the multi-headed monster Hydra.

Online voting will last two weeks. Twelve choices are available at the website 'Pluto Rocks'. Choices include the hero who slew Hydra, Hercules and Styx, the river to the underworld.

Write-in suggestions are welcomed.