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Pluto’s Not a Planet: Discussion Guide


Overview 

When the International Astronomical Union (IAU) met on August 24, 2006, astronomers  voted to reclassify Pluto from a planet to a dwarf planet. Explore the new definition of a  planet and the downsizing of the solar system to eight “true” planets — changes that have  sparked public debate as well as new understandings of the evolving nature of science.  Learn too why Pluto has been at the center of controversy ever since it was first  recognized in 1930. As technology advanced, Pluto’s position in the scientific  community declined. 

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