Further observations of an object dubbed 2003 UB313, which lies beyond Neptune, show that its diameter is around 3,100 kilometres. This makes it larger than Pluto, the smallest ‘traditional’ Solar System planet.
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Sheppard, S. A planet more, a planet less?. Nature 439, 541–542 (2006). https://doi.org/10.1038/439541a
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DOI: https://doi.org/10.1038/439541a
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