TCS: Categorical Errors: Pluto TCS: Categorical Errors: Pluto

TCS Daily: Categorical Errors discusses how we lost a planet and gained something else, through a reclassification of Pluto. The line had to be drawn somewhere, and it just became too obvious that the same category that included four giants should also include an object that is not that roundish, not very big, and not in an almost circular orbit.