https://solarsystem.nasa.gov/planets/dwarf-planets/pluto/overview/

Jan 28, 2019 ... Pluto is the best known world of the vast, intriguing Kuiper Belt. ... in Size, But Not in Importance. Pluto is officially classified as a dwarf planet. 5 ...

https://en.wikipedia.org/wiki/Pluto

According to this resolution, there are three conditions for an object in the Solar System to be considered a planet: The object ...

https://www.space.com/25986-planet-definition.html

Apr 7, 2018 ... Astronomers define a planet as an object that orbits the sun (but not ... This definition meant that Pluto — considered a planet at the time — was ...

https://www.space.com/40550-pluto-planet-debate-flares-up-again.html

May 11, 2018 ... Under this definition, Pluto and other dwarf planets, such as Ceres and Eris, are considered planets, as are large moons like Jupiter's Europa, ...

https://www.space.com/why-pluto-is-not-a-planet.html

Mar 28, 2019 ... Pluto has always been an oddball, but here's why it's no longer considered a planet.

https://www.space.com/41769-pluto-planet-definition-debate-rages-on.html

Sep 10, 2018 ... Scientists have spent 12 years arguing over how to classify Pluto, and a recently published paper offers a new — but surprisingly old — reason ...

http://blogs.discovermagazine.com/outthere/2018/06/05/the-is-pluto-a-planet-debate/

Jun 5, 2018 ... Pluto went through a similar evolution. It was classified as a planet about as long as Ceres was, but with some differences. For more than 60 ...

https://www.cnn.com/2018/09/10/world/pluto-planet-status-trnd/index.html

Sep 10, 2018 ... Their research suggests the rationale used to downgrade Pluto from a planet to a dwarf planet was not valid.

http://now.northropgrumman.com/pluto-discovery-debacle-is-pluto-a-planet-again/

Jan 4, 2019 ... Pluto easily meets the first two criteria, but fails the third. The result? Pluto — along with Eris, Sedna and other large TNOs — were re-classified ...

https://phys.org/news/2018-09-pluto-reclassified-planet.html

Sep 7, 2018 ... The reason Pluto lost its planet status is not valid, according to new ... 1802—that used the clearing-orbit requirement to classify planets, and it ...