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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 >>

Pluto - Wikipedia

en.wikipedia.org/wiki/Pluto

Pluto (minor-planet designation: 134340 Pluto) is a dwarf planet in the Kuiper belt, a ring of bodies beyond Neptune. It was the first Kuiper belt object to be discovered. Pluto was discovered by Cl...

Why Is Pluto No Longer a Planet? | Wonderopolis

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

Because it does not follow this rule, Pluto is no longer considered a planet. ... Dwarf planets, like Pluto, have not yet cleared the neighborhoods of their orbits ...

Why Pluto is No Longer a Planet - Universe Today

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

Nov 27, 2009 ... 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 ...

Why is Pluto no longer a planet? - BBC News - BBC.com

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

Jul 13, 2015 ... In 2006, Pluto was demoted from planet status. Why was it removed from the planet club?

Why is Pluto no longer considered a planet? | HowStuffWorks

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.

Why Is Pluto No Longer A Planet - Planets For Kids

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, ...

What Is Pluto? | NASA

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.

Why is Pluto not a planet? – Greg Laden's Blog - ScienceBlogs

scienceblogs.com/gregladen/2015/07/13/why-is-pluto-not-a-planet/

Jul 13, 2015 ... The simplest reason that Pluto is not a planet is that planet experts say so, .... there are (were) 35 (known bodies that were considered) planets.

Why is Pluto no longer a planet? (Everyday Mysteries: Fun Science ...

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

Essentially Pluto meets all the criteria except one- it “has not cleared its ... A “ dwarf planet,” as defined by the IAU, is a celestial body in direct orbit of the Sun that ... and considered the name for the god of the underworld appropriate for such a ...