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.
Unlike its bigger sister Pluto, dwarf planet Makemake doesn't have an atmosphere, new observations have revealed.
NASA's New Horizons spacecraft - now just two years away from Pluto - is on a riskier mission than previously realized, thanks to the threat posed bty the planet's moons and possible rings.
NASA has confirmed the discovery of a fifth moon orbiting the icy dwarf planet Pluto.
Eris - the dwarf planet that led to Pluto's demotion from planetary status - appears actually to be smaller than Pluto after all.
Quite by accident, astronomers using the Hubble Space Telescope have discovered a fourth moon orbiting the (dwarf) planet Pluto.
The latest set of pictures from NASA's Hubble Space Telescope provide the most detailed images yet of Pluto.