From the introduction: In this role-playing game...students play one of nine astronomers arguing the definition of a planet at a 1999 debate in New York City and a 2006 meeting of the International Astronomical Union. This game can be played with up to 27 students during one or two class periods as a substitute for or complement to traditional lectures on Pluto and the Kuiper Belt. It is recommended, but not required, that students have access to The Hunt for Planet X: New Worlds and the Fate of Pluto by Govert Shilling.