In part one, your astronomers read an interview dialogue between a reporter and Dr. Maria Ocasio, the chair of the group that assigns names to celestial objects. The topic in question is Pluto's status. Learners research Plutinos and discuss the information gathered. In part two, they read about the need to define planets. Where this lesson is mostly reading and discussion, it is a recent topic. Since its publication, a definition has been adopted and Pluto has been reclassified.