Smallest planet yet found outside solar system

FILE - This file image provided by NASA on Feb. 22, 2006 from it's Hubble Space Telescope shows Pluto and three of it's five moons. Astronomers announced a contest Monday, Feb. 11, 2013 to name the two tiny moons of Pluto discovered over the past two year Photo by HOPD
FILE - This file image provided by NASA on Feb. 22, 2006 from it's Hubble Space Telescope shows Pluto and three of it's five moons. Astronomers announced a contest Monday, Feb. 11, 2013 to name the two tiny moons of Pluto discovered over the past two year Photo by HOPD
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