Lecture 45: Is Pluto a Planet?
What is a planet? Is Pluto a planet? This lecture traces the debate on\nthe nature of what it means to be a planet by taking an historical approach, \nlooking at how the question has arisen with the discovery of the asteroids and\nlater Pluto and the Kuiper Belt. Many of the issued raised at the 2006\nIAU General Assembly meeting were raised two centuries before after the\ndiscovery of Ceres and Pallas. We will end with the new definition of a\nplanet, and why Pluto is better understood as a Dwarf Planet, among the\ntwo largest objects of the class of small icy bodies of the outer solar\nsystem, than as the smallest of the planets. Recorded 2006 Nov 30 in\n100 Stillman Hall on the Columbus campus of The Ohio State University.