New Pluto Moon Discovered By Hubble Space Telescope

07/20/2011 12:39 pm ET | Updated Sep 19, 2011

HOUSTON -- Distant and tiny Pluto has been hiding something from Earth: another moon.

NASA announced 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 3 billion miles from Earth.

But it is a mini-moon. It is only eight to 21 miles wide. Pluto's biggest moon, Charon (SHARE-on), is 80 times bigger. The other two moons are Nix and Hydra.

Until astronomers decide a name, this moon is called P4.

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