Xena dazzles

April 2006
New Scientist;4/22/2006, Vol. 189 Issue 2548, p7
This article presents information about the newly discovered 10th planet, Xena. Xena, it seems, is only slightly larger than Pluto--not 30 per cent bigger as previously thought. It is officially called 2003 UB313 and lies about three times as far from the sun as Pluto. To reveal Xena's size more accurately, Mike Brown at the California Institute of Technology in Pasadena, California, and colleagues analyzed Hubble images taken in December 2005. They found Xena is 2400 kilometers across, only about 5% larger than Pluto.


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