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Debate hope to pin down what defines a planet
A heated debate over what defines a planet comes to a head this month at a meeting of the International Astronomical Union.
Astronomers have found many new worlds that are hard to classify: icy bodies beyond Neptune that don't seem big enough to be planets. Others are free floating bodies as big as Jupiter, with no parent star.
An an IAU meeting in Prague this month, astronomers are hoping to define what a planet is, something that could relegate Pluto's status.
A decision is expected in September.
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