Since Neil-Tyson Griffer spearheaded the demotion of Pluto, turns out it is really quite interesting and should have been a planet all along!!!
Neil is an insufferable narcissist
When discovered, Pluto was considered larger than Mercury.
But since then, as the science improved, Pluto has shrunk.
The moons of Pluto were discovered and the albedo of it has increased. So now, its diameter is not even half of Mercury, its size about tenth of Mercury, the mass only about 1/25 of Mercury.
There are now several known bodies around the size of Pluto, and more to be discovered.
People studying planets do not want to learn about Quaoar and Makemake.
The cutoff of planets were raised and Pluto did not make it!
As a matter of fact Clyde Tombaugh, who discovered Pluto in 1930 was a very nice man and lived a long life.
Astronomers have not wanted to make him sad, so they waited until his death to downgrade Pluto!
When he finally passed in 1997, the downgrade discussion started immediately and Pluto was officially downgraded in 2006.