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Maths confirms Pluto’s not a planet

A new formula seeks to define a planet. As Rick Lovett reports, 99% of the exoplanets found so far qualify, but Pluto does not. 

Images of Pluto taken by New Horizons have awakened affection for the distant body. But should sentiment determine whether it is a planet?
Images of Pluto taken by New Horizons have awakened affection for the distant body. But should sentiment determine whether it is a planet?
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