Pluto was the last of the nine major planets that made up our solar system, the farthest out, swimming sadly in the abyss, looping the rest of the planets on its long lonely orbit. It wasn’t discovered until 1930, pretty late for a planet. Named after the Roman god of the underworld, Pluto boasted one moon, Charon (he who ferries the dead over the river Styx), which wasn’t detected until 1978. The Hubble Space Telescope allowed astronomers to add two more sinister-sounding moons as recently as 2005, Nix and Hydra. The following year, it was determined that Pluto fails to meet one of three criteria of planethood (its mass is only 0.07 times that of the mass of the other objects in its orbit), and so it has been reclassified a dwarf planet.

Astronomers have now identified two more bodies orbiting Pluto, P4 and P5 for the moment. The SETI Institute is holding a vote on the names of the two new moons. Head on over to select from their list of classical mythic figures associated with the underworlds of antiquity.

E-Verse is going for Cerberus, Persephone, and Orpheus (obviously). Vote today! Vote soon, and often (you can vote again after 24 hours).