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Live Science

Why is Pluto not considered a planet?

Live Science
Summary
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77% Informative

The International Astronomical Union demoted Pluto from a planet to a dwarf planet in 2006 .

Some scientists want to revise the definition of a planet.

Pluto's demotion remains controversial for some scientists, though, in part because of the way it was reclassified.

Many people grew up thinking of Pluto as a planet, and they are still emotionally invested in it.