FILE - In this file image provided by NASA Feb. 22, 2006 from NASA's Hubble Space Telescope shows Pluto and three of it's moons. A team of scientists using the Hubble Space Telescope said Wednesday, July 11, 2012, they have discovered the tiniest moon yet around Pluto. That brings the number of known moons to five. (AP Photo/NASA,File)

Associated Press
FILE - In this file image provided by NASA  Feb. 22, 2006 from NASA's Hubble Space Telescope shows Pluto and three of it's moons.  A team of scientists using the Hubble Space Telescope said Wednesday, July 11, 2012,  they have discovered the tiniest moon yet around Pluto. That brings the number of known moons to five. (AP Photo/NASA,File)
FILE - In this file image provided by NASA Feb. 22, 2006 from NASA's Hubble Space Telescope shows Pluto and three of it's moons. A team of scientists using the Hubble Space Telescope said Wednesday, July 11, 2012, they have discovered the tiniest moon yet around Pluto. That brings the number of known moons to five. (AP Photo/NASA,File)
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