^ well today they reclassifed it as not being a planet
"On August 24, 2006, however, the previous draft was reversed, according to the newly passed rule, Pluto was demoted from planetary status to a dwarf planet. There are three main conditions for an object to be called a 'planet', according to the IAU resolution. The first is that the object must be in orbit around a star, but not be a star itself. Secondly, the object must be massive enough to be a sphere by its own gravitational force. Thirdly, it must have cleared the neighborhood around its orbit. Pluto fails to meet these conditions but will act as a prototype for a yet to be named category of Trans-Neptunian objects."