There once was a time the solar system consisted of nine planets. But in 2006, the unthinkable happen. We lost the beloved planet, Pluto and gained a new way to classify celestial objects. And our lives have never been the same. Pluto had a rough go as a planet. He was the runt of the solar system, always in the back of the line and in 2006, he was kicked out of the planet club.
As of 2006, there are three criteriums a celestial body has to meet to be considered a planet. And Pluto meets two of these criteriums. He has enough mass and gravity to hold a spherical shape and he orbits the sun. But he doesn’t “clear the neighborhood” around his orbit. The eight other planets are gravitationally dominant, meaning there are no other celestial bodies in their orbital path this isn’t the case for Pluto. So he got reclassified as a Dwarf Planet.