WHY PLUTO IS NOT A PLANET ANYMORE?

 Pluto was discovered by Clyde Tombaugh in 1930

 It is not considered a planet anymore in 2006 because  astronomers of IAU gave a new definition to the word planet

According to the new definition, a planet is a celestial body, which is in orbit around the sun, is spherical in shape and it has cleared the neighborhood around its orbit what does this mean?it basically means that using its gravity. A planet has removed steroids and dwarf planets, out of its path. pluto is in orbit around the sun and spherical in shape. But since Pluto neighborhood has many other objects, and it is not cleared its neighborhood it is not called a planet anymore