Whether or not astronomers decide to classify a recently discovered solar system body as the 10th planet, this icy object now has a feature common to most other planets. Researchers announced Sept. 30 that the body, officially dubbed 2003 UB313 but nicknamed Xena, has a moon.
The newfound moon has a diameter about one-tenth that of Xena, which the scientists estimate is about 2,700 kilometers wide (SN: 8/6/05, p.
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