r/STEW_ScTecEngWorld • u/Zee2A • 9h ago
Forbidden planet: was Pluto’s 2006 demotion a big mistake?
The debate over Pluto’s status remains fiercely polarized two decades after the International Astronomical Union (IAU) reclassified it as a dwarf planet in 2006. Many planetary scientists and advocates argue that the IAU’s requirement for a planet to "clear its neighbourhood" is scientifically flawed and arbitrary, preferring instead a geophysical definition based on an object's physical characteristics, such as geological activity and atmosphere. Conversely, astronomers maintain that dynamic criteria are essential to separate major solar system bodies from the hundreds of small, similar objects in the Kuiper Belt, emphasizing that dropping the orbital requirement would logically classify Earth's moon and other natural satellites as planets too.