Astronomers announced this weekend the discovery of the "10th planet" to orbit our Sun. Designated 2003 UB313, this is the largest object found in our Solar System since Neptune in 1846.
2003 UB313 is about 3,000km across (larger than Pluto) and is three times as far away as Pluto, in an orbit at an angle to the orbits of the main planets (44-degrees).
This "planet" will eventually get a cool name. I say "planet" because there is debate about whether Pluto is even a planet or a kuiper belt object.
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