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Back in 2006, a science organization changed the classification of Pluto as a planet, sparking a debate in both the astronomical community and pop culture. More than 15 years later, a new paper is reigniting that debate.

Back in 2006, a science organization changed the classification of Pluto as a planet, sparking a debate in both the astronomical community and pop culture. More than 15 years later, a new paper is reigniting that debate.

Planetary scientists want Pluto classified as a planet again, and a petition to reconsider planet hood is gaining momentum.