Poor little Pluto! Space and planets are topics of endless fascination to kids and part of every grade-school curriculum. Yet because of the history-making reassignment of Pluto from "planet" to "dwarf planet" on August 24, 2006, all books on the solar system are now out of date. Enter When Is a Planet Not a Planet? The Story of Pluto by Elaine Scott, an esteemed writer of non-fiction for children. Scott is the first to put the answer to the title question into terms simple enough for a very young audience to understand, based upon the new definitions determined by the International Astronomical Union. Well researched, this exciting new audiobook makes clear what astronomers have argued about for decades.