What makes Pluto not exist anymore?

Pluto was discovered in 1930 by US astronomer Clyde Tombaugh, who was using the Lowell Observatory in Arizona. ... Gingerich of Harvard, who chaired the planet definition committee, revealed that only 10% of the 2,700 scientists who had attended the 10-day meeting were present at the Pluto vote. read more

Four of the dwarf planets — Pluto, Makemake, Haumea and Eris — are located beyond Neptune. The fifth dwarf planet, Ceres, lives in an asteroid belt between Mars and Jupiter. Facts about Pluto: Pluto is about the size of the moon. It takes approximately 248 Earth years for Pluto to make one trip around the sun. read more

Actually, I still think this definition makes very little sense. Not because of Pluto: Pluto’s status is, or should be, pretty much irrelevant in the debate, but because of other things: – The “clearing the neighborhood” thing is totally arbitrary in what constitutes a “clean neighborhood”, or even a “neighborhood”. read more

Pluto used to be called the ninth planet from the sun, but today it is called a "dwarf planet." read more