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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 ... The IAU has not formalized a definition for binary dwarf planets, and Charon is officially classifi...

Why Is Pluto No Longer a Planet? | Wonderopolis

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.

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 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? (Everyday Mysteries: Fun Science ...

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 ...

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 a dwarf planet in our solar system. ... But Pluto does not orbit in a circle. The orbit of Pluto ..... Large debris could be satellites that are no longer working.

Pluto Not a Planet, Astronomers Rule - National Geographic News

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."

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.