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There's more in the article, but there are the key points.
"The scientific community has realised that the classification used for Pluto for 75 years was not correct" says Gonzalo Tancredi of the University of the Republic in Montevideo, Uruguay.
Tancredi was part of the group who lobbied to change the original draft definition, which would have included Pluto as a planet and possibly hundreds more icy objects. "I'm pretty happy," Tancredi told New Scientist.
So where does that leave the solar system? There are eight planets: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune.
Then there are three recognised dwarf planets: Pluto, Ceres (formerly an asteroid), and the largest dwarf, UB313, popularly known as Xena. Many more dwarf planets will follow. Most will be icy middleweight objects in the Kuiper Belt out beyond Neptune, and one or two may be asteroids.
There's more in the article, but there are the key points.