https://www.britannica.com/story/why-is-pluto-no-longer-a-planet
What was once a loose word used to describe a large object within the solar system was now specific: planets are celestial objects large enough to be made rounded by their gravitational orbit around the Sun and to have shooed away neighboring planetary objects and debris. Pluto is now classified as a dwarf planet because, while it is large

https://www.loc.gov/everyday-mysteries/astronomy/item/why-is-pluto-no-longer-a-planet/
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 define a full-sized planet. Essentially Pluto meets all the criteria except one—it "has not cleared its neighboring region of other objects.". The Rich Color Variations of Pluto.

https://www.bbc.com/news/science-environment-33462184
On 24 August, the last day of the assembly, members voted to adopt a new resolution outlining criteria for naming a planet: IAU. Pluto met the first two of the these criteria, but the last one

https://www.popsci.com/why-is-pluto-no-longer-planet/
Pluto is not a planet because it fails a three-part astronomy test. NASA / Johns Hopkins University Applied Physics Laboratory / Southwest Research Institute. When I need to remember the order of

https://www.cnn.com/2019/08/24/world/pluto-no-longer-planet-space-scn/index.html
01:03 - Source: CNN. CNN —. Pluto was long considered our solar system's ninth planet. Although small, it orbits the sun and has the spherical shape required to be considered a planet. Pluto

https://www.space.com/why-pluto-is-not-a-planet.html
Pluto, officially a dwarf planet, has surprising complexity on its surface. While certainly a world, not everyone agrees it is a planet.

https://www.npr.org/2024/06/22/g-s1-5023/pluto-dwarf-planet-solar-system-ceres
Planet or not, Pluto is useful for understanding how planets form. "As a scientist who studies how planets form, Pluto is a brick that helps me understand the building," says Lyra.

https://www.nationalgeographic.com/science/article/pluto-planet-dwarf-planetoid-solar-system
Experts debate. It's been 18 years since Pluto's celestial status was called into question—yet the matter seems far from settled. We asked experts from both sides to make their case. This

https://www.nationalgeographic.com/science/article/dwarf-planet-pluto-astronomy
Pluto has been voted off the island. The distant, ice-covered world is no longer a true planet, according to a new definition of the term voted on by scientists today. "Whoa! Pluto's dead," said

https://www.wonderopolis.org/wonder/why-is-pluto-no-longer-a-planet
Some of the objects may crash into the planet, others may become moons. Pluto follows the first two rules: It is round, and it orbits the sun. It does not, however, follow the third rule. It has not yet cleared the neighborhood of its orbit in space. Because it does not follow this rule, Pluto is no longer considered a planet.

https://www.theatlantic.com/science/archive/2021/08/why-isnt-pluto-a-planet/619907/
The New Horizons flyby found evidence that Pluto—little Pluto!—might even have an ocean beneath its surface. "The name doesn't matter," Sanjay Limaye, a planetary scientist at the

https://www.usatoday.com/story/news/2022/08/31/why-is-pluto-not-planet/10249425002/
They determined the Solar System contains eight planets: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune. Pluto does not meet the third criteria because it is not gravitationally

https://www.universetoday.com/13573/why-pluto-is-no-longer-a-planet/
In 2006, the IAU voted to remove Pluto from the list of planets in the Solar System. Instead, Pluto, and other large objects would be classified as Dwarf Planets. Why Pluto is no longer a planet.

https://science.howstuffworks.com/pluto-planet.htm
But this may not be the last word on Pluto. In 2014, after a debate among scientists sponsored by the Harvard-Smithsonian Center for Astrophysics, the majority of the nonexpert audience voted for a simpler definition of planet — basically, that a planet had to be spherical and orbit around a star or the remnants of one — that included Pluto, according to an article on the center's website.

https://www.scienceabc.com/nature/universe/journey-of-pluto-why-it-lost-its-status-as-a-planet.html
The reason why Pluto is not considered a planet anymore is because it does not satisfy the third requirement of being a planet, which is that it must have "cleared the neighborhood" of its orbit. This means that a planet must be the basic dominant gravitational body in its orbit, and Pluto is not. There are many objects similar to Pluto in

https://phys.org/news/2022-08-pluto-planet-longer.html
Here's why Pluto isn't officially considered a planet anymore. Why is Pluto not a planet? Pluto came into the lexicon in 1930 when astronomer Clyde Tombaugh discovered it when searching for signs

https://www.astronomy.com/science/pluto-is-the-most-famous-demoted-planet-but-its-not-the-first/
When I am asked directly if I think Pluto is a planet, I tell everyone my answer is no. It all goes back to the origin of the word "planet.". It comes from the Greek phrase for "wandering

https://www.washingtonpost.com/lifestyle/kidspost/pluto-not-a-planet/2021/08/23/ae8fd57c-fbb8-11eb-8a67-f14cd1d28e47_story.html
But 15 years ago, a group of scientists known as the International Astronomical Union voted to make the definition of "planets" more specific, and Pluto no longer made the cut. According to

https://www.youtube.com/watch?v=n6dbT9StGCE
If you were in elementary school before 2006, there's a good chance you had to memorize the order of the 9 planets in our solar system; Mercury, Venus, Earth

https://www.bbc.co.uk/news/science-environment-33462184
On 24 August, the last day of the assembly, members voted to adopt a new resolution outlining criteria for naming a planet: IAU. Pluto met the first two of the these criteria, but the last one

https://www.youtube.com/watch?v=FO11xLAEOZQ
Ever wondered why Pluto is no longer considered a planet? In this video, we unravel the story behind Pluto's reclassification. Discover the criteria set by t

https://www.forbes.com/sites/quora/2019/12/16/why-is-pluto-no-longer-considered-a-planet/
Pluto was discovered because Neptune's orbit showed an anomaly that indicated that there was something else out there. So they looked and eventually Clyde Tombaugh discovered Pluto. Right from

https://www.newscientist.com/article/2439717-a-new-formula-for-defining-a-planet-still-keeps-pluto-out-of-the-club/
The official definition of a planet, which famously saw Pluto demoted to dwarf planet status in 2006, doesn't really work for worlds outside of our solar system. Now there is a fix - but Pluto

https://www.reddit.com/r/explainlikeimfive/comments/r5tre/why_is_pluto_no_longer_a_planet/
That's not true. Ceres, the largest asteroid, is formally classified as a dwarf planet. Size doesn't really matter, as long as the body is massive enough to retain a relatively spherical shape. Pluto was demoted to a dwarf planet because it didn't "clear its neighborhood", i.e. its orbit overlaps with other things.

https://gizmodo.com/planet-definition-exoplanets-sorry-pluto-2000469745
That's why the team put an upper bound on mass in their definition of a planet. And in case you're wondering, Pluto weighs approximately 2.89*10 22 (1.31*10 22 kg).

http://scienceline.ucsb.edu/getkey.php?key=1504
For now, there are three official classes of objects in our Solar System: planets, dwarf planets, and small solar system bodies. Planets include the eight traditional planets from Mercury to Neptune, but no longer Pluto. Pluto is joined amongst the dwarf planets. Pluto_1 Hope it helps! I will admit I was a little surprised when Pluto was

https://www.msn.com/en-us/news/technology/pluto-s-not-coming-back-but-astronomers-want-to-redefine-planets-again/ar-BB1pP3R1
A group of astronomers want to change the definition of a planet. Why it matters: Their new proposed definition wouldn't bring Pluto back into the planetary fold, but it could reclassify thousands

https://pluto.jhuapl.edu/
The New Horizons spacecraft launched on January 19, 2006 — beginning its odyssey to Pluto and the Kuiper Belt. New Horizons now continues on its unparalleled journey of exploration with the close flyby of a Kuiper Belt object called 2014 MU69 — officially named Arrokoth — on January 1, 2019.

https://www.cnn.com/2024/07/04/climate/heat-waves-air-conditioning-climate/index.html
Drastically cutting planet-heating pollution is the best long-term defense against heat and extreme weather, but the world is already committed to several decades of rising temperatures, Stone said.

https://science.nasa.gov/neptune/neptune-facts/
Neptune is the only planet in our solar system not visible to the naked eye. In 2011 Neptune completed its first 165-year orbit since its discovery in 1846. ... Sometimes Neptune is even farther from the Sun than dwarf planet Pluto. Pluto's highly eccentric, oval-shaped orbit brings it inside Neptune's orbit for a 20-year period every 248 Earth