Ron says.. if you look at the chart in the article you see that it is about the size of our moon.
BBC NEWS | Science/Nature | Distant world tops Pluto for size: "Distant world tops Pluto for size
By Jonathan Amos
BBC News science reporter
Artist's concept of the 10th planet and its moon (R Hurt, IPAC)
An artist's concept of the '10th planet' and its moon
An icy, rocky world found last year to be orbiting the Sun in the distant reaches of the Solar System really is bigger than Pluto, scientists say.
New observations of the object, which goes by the designation 2003 UB313, show it to have a diameter of some 3,000km - about 700km more than Pluto."
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