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Object Bigger than Pluto Discovered, Called 10th Planet
29 July 2005
Astronomers have discovered an object in our solar system that is larger than Pluto. They are calling it the 10th planet, but already that claim is contested.
The new world's size is not at issue. But the very definition of planethood is.
It is the first time an object so big has been found in our solar system since the discovery of Pluto 75 years ago.