NASA is reporting that 2003 UB313, the 'tenth planet' of the Solar System, is about 30% larger than Pluto. Dubbed Xena, the planet has a diameter of 1,490 miles, which is bigger than Pluto's 1,422 miles. The Hubble Space telescope was used to measure the planets' diameters.Photo credit: NASA, ESA and A. Schaller (for STScI)
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