Astronomers at the SETI (Search for Extraterrestrial Intelligence) Institute launched the website PlutoRocks.com to open a public vote on the names of P4 and P5, Pluto's two smallest moons.
The moons were discovered in images taken by the Hubble Space Telescope in 2011 and 2012. Tradition dictates that Pluto's moons be named after Grrek and Roman mythological characters connected to Hades and the underworld. Choices include notable pair Orpheus and Eurydice, as well as Hercules, Hypnos, Cerberus and Styx.
Current vote totals are available on the website. Voting ends at noon EST on Monday, Feb. 25, 2013.