This is hardly a scientific comment. What makes a planet “special?” Who decides? Why can there not be many subcategories of planets, each with their own unique features? The alternative conclusion, which Brown rejects, that many other things are planets, makes far more sense. If that means we end up with a solar system of 100 planet, so be it. Changing designations just for our convenience is not a scientific decision. The IAU’s classification of a dwarf planet as not a planet at all makes no sense either. And we already knew Eris was bigger than Pluto so it makes sense that if their composition is very similar, Eris would also be more massive. That changes nothing; it does not preclude Pluto and Eris from being the solar system’s ninth and tenth planets. Dr. Brown’s discovery of Eris is a tremendous accomplishment, but it does not give him the right to dictate and impose his view of “just the way it is.”