New moon found circling Pluto
Houston - Distant and tiny Pluto has been hiding something from Earth: another moon.
Nasa announced on Wednesday that the Hubble Space Telescope has found a fourth moon circling Pluto, which had been demoted from full planet to dwarf planet. Astronomers had been looking to see if Pluto had a ring, but instead they found another object circling the dwarf planet that is 4.8bn km from Earth.
But it is a mini-moon. It is only eight to 33km wide. Pluto's biggest moon, Charon, is 80 times bigger. The other two moons are Nix and Hydra.
Until astronomers decide a name, this moon is called P4.