Adler Planetarium lecture: Michael E. Brown, California Institute of Technology astronomer
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Brown lectures on the possibility of there being a ninth planet in our solar system. "The past decade has seen an explosion in the discoveries of Pluto-sized and near-Pluto-sized bodies in the outer solar system, giving rise to a new classification of 'dwarf planets'," according to an announcement. "Like Pluto, each of these bodies has a unique story to tell about the history and evolution of the solar system.