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Which argument supporting the classification of Pluto as a planet is the weakest?

A Pluto has been classified as a planet for more than sixty years since the discovery.

This is the weakest argument because it is justified with authority, tradition, and past belief, rather than scientific facts. People have been wrong in the past, and noting that something has been done a certain way for years does not mean that there are no better ways, and it is not a convincing scientific argument.

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