tenth planet
2003UB313, a Kuiper Belt Object about 97AU from the sun, has been determined to be at least as big as Pluto (ie ~2600 km diameter; Pluto is about 2250 km), making it the tenth planet of our sun. This is considerably bigger than Quaoar, which had been the best previous candidate to be the tenth planet until its diameter was determined to be 1250 km, about the same size as Pluto's moon Charon. There are probably a handful of other similarly-sized Kuiper Belt Objects yet to be discovered.
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