Two moons need names - and SETI wants your help

By tradition, the moons of Pluto have names associated with Hades and the underworld. But there's plenty of possibilities to choose from - and the discoverers of the planet's two tiniest moons are inviting the public to name them.

Fourth moon discovered around Pluto

Quite by accident, astronomers using the Hubble Space Telescope have discovered a fourth moon orbiting the (dwarf) planet Pluto.