A group of scientists have redefined the meaning of a planet. According to the team of scientists, a planet is a sub-stellar mass body that has never undergone nuclear fusion and that has enough gravitation to be round due to hydrostatic equilibrium regardless of its orbital parameters. This means that Pluto once again, is now considered a planet.
A Scientist named Mike Brown stated that this team of scientists want Pluto to be a planet because they want to be flying to a Planet. Looks like your Geology and Astronomy classes just become much harder, that is, if your professors want to you memorize every single planet. Good luck!