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Pluto does not meet all three criteria that now define a planet. A planet must orbit around the Sun, have sufficient mass to maintain a nearly round shape, and it must have cleared the neighborhood around its orbit.
Pluto has not cleared the neighboorhood around its orbit. It has been reclassified as a "dwarf planet". More >>

wonderopolis.org/wonder/why-is-pluto-no-longer-a-planet

The truth is, nothing about Pluto changed, but the definition of a planet did. Once these changes became official, Pluto no longer fit the definition of a planet.

www.bbc.com/news/science-environment-33462184

Jul 13, 2015 ... Nasa's New Horizons mission made a close pass of Pluto this week. For more than 70 years, Pluto was one of nine planets recognised in our ...

www.universetoday.com/13573/why-pluto-is-no-longer-a-planet

Jan 5, 2012 ... Let's find out why Pluto is no longer considered a planet. Pluto was first discovered in 1930 by Clyde W. Tombaugh at the Lowell Observatory in ...

www.loc.gov/rr/scitech/mysteries/pluto.html

The International Astronomical Union (IAU) downgraded the status of Pluto to that of a dwarf planet because it did not meet the three criteria the IAU uses to ...

www.nasa.gov/audience/forstudents/k-4/stories/nasa-knows/what-is-pluto-k4.html

Pluto is not very big. It is only half as wide as the United States. Pluto is smaller than Earth's moon. This dwarf planet takes 248 Earth years to go around the sun.

www.planetsforkids.org/why-is-pluto-no-longer-a-planet.html

Pluto used to be known as the smallest planet in our solar system, and the furthest planet from the sun. Pluto was discovered in 1930 by Clyde Tombaugh, ...

news.nationalgeographic.com/news/2006/08/060824-pluto-planet.html

Aug 24, 2006 ... Pluto is no longer a planet, according to a new official definition. Instead the icy sphere will be considered one of more than 40 "dwarf planets."

science.howstuffworks.com/pluto-planet.htm

Aug 24, 2006 ... Pluto, shown as the outermost ring in both illustrations, has the most irregular orbit of all of the objects previously considered planets.

www.ask.com/youtube?q=Why+Is+Pluto+No+Longer+a+Planet%3F&v=pTZMgoh663I
Apr 15, 2014 ... ya know pluto was considered as a planet but on 2006 not anymore ... People cry about how pluto not being a planet anymore but no one cries over the moon not being a planet anymore .... Why Pluto is No Longer a Planet?