Why Was Pluto Kicked Out of the Solar System?

For advanced readers, parents, and educators interested in exploring this idea more here are a few resources to get started with:

Moons are planets: Scientific usefulness versus cultural teleology in the taxonomy of planetary science: https://www.sciencedirect.com/science/article/pii/S0019103521004206 (This paper gives an excellent overview of the history and current usage of the term planet.)

Geophysical Planet Definition: https://www.hou.usra.edu/meetings/lpsc2017/pdf/1448.pdf

News article about planetary scientist letter to IAU: https://spaceref.com/press-release/planetary-scientists-and-astronomers-oppose-new-planet-definition/

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