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New Pluto Moon Discovered By Hubble Space Telescope

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NEW PLUTO MOON
This image provided by NASA combines two labeled images of the Pluto system taken by the Hubble Space Telescope's Wide Field Camera 3 ultraviolet visible instrument with a newly discovered fourth moon P4 circled. NASA announced Wednesday, July 20, 2011 that the Hubble Space Telescope has found a fourth moon circling Pluto, which had been demoted from full planet to dwarf planet. The image on the left was taken on June 28, 2011. The image on the right was taken on July 3, 2011. (AP Photo/NASA, ES | AP

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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