The Daily Show - Neil deGrasse Tyson on Pluto

Neil deGrasse Tyson got hate mail from third graders because of Pluto.
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Tyson is wrong about Pluto. It is a planet because unlike most objects in the Kuiper Belt, it is large enough to have pulled itself into a round shape--a condition known as hydrostatic equilibrium. When this happens, objects become geologically differentiated, just like the larger planets and unlike shapeless, inert asteroids and KBOs. An object in hydrostatic equilibrium orbiting a star (and not a star itself) is a planet. If that means we have dozens of planets, then so be it. The universe was not designed for our convenience.

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