Astronomers' arguments over the definition of "planet" have intensified since the discovery of a new object orbiting the Sun. This new object, tagged "2003 UB313", is spherical, and larger than Pluto. In fact, at 1860 miles across, it's nearly half the diameter of Mars.
If this object is not a planet, then it's hard to justify calling Pluto one. If Pluto isis a planet, there may be a whole bunch of objects that qualify as planets, buried out in the Kuiper belt, and maybe even in the Oort cloud.
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