pluto (planet)
An astral body in the solar system that was discovered February 18, 1930. It was originally classified as a planet since 1930. In 2006 the International Astronomical Union (IAU) defined what they considered to be a planet, which exempted celestial bodies such as Pluto, and reclassified them as "dwarf planets" (which despite the naming are not considered planets, much like velvet ants are actually wingless wasps that simply look like ants). The IAU's definition of a planet was met with mixed responses, with those in favor of it and those who oppose it. For tagging purposes various large spherical planet or planet-like objects are to be tagged planet for simplicity sake.