Very interesting. Most of us weren't even born when Pluto was discovered in 1930. Pluto is automatically disqualified because its oblong orbit overlaps with Neptune's. Instead, it will be reclassified in a new category of "dwarf planets," similar to what long have been termed "minor planets." The definition also lays out a third class of lesser objects that orbit the sun — "small solar system bodies," a term that will apply to numerous asteroids, comets and other natural satellites. I am thinking- how many textbooks need to be updated due to this downsizing decision.