The International Astronomical Union has decided that Pluto no longer is considered a planet. This distant body has been reclassified as a “dwarf planet,” along with two other bodies, Xena and Ceres. While some may feel cheated, losing one of their beloved planets, the Smithsonian Air & Space Museum was quick to adopt the new standard. Within a week and a half, the museum had begun making changes to the solar system exhibit. The symbol of Pluto, which had been in a list of all the planets, was hidden behind a black plastic square.

Also, next to a detailed description of Pluto and Neptune a temporary poster had been set up explaining the recent change by the IAU and its effect on Pluto.

Looks like the Smithsonian has some work ahead–adding several new dwarf planets to the models and descriptions.