The fact that Pluto was reclassified as a dwarf planet in 2006 still causes debates in scientific circles. For instance, Dr. Alan Stern, a planetary scientist who leads NASA’s New Horizons mission, thinks that the International Astronomical Union has made a hasty and wrong decision. According to Dr. Stern, the definition of a planet created by the IAU is poorly worded and doesn’t make scientific sense. Nevertheless, officially, Pluto remains a dwarf planet alongside Eris, Ceres, Haumea, and Makemake.