It's because Pluto is not the dominant object in the neighbourhood of its orbit.
It wasn't discovered to not be a planet, it was decided to no longer be a planet. Recently, the last 2 or 3 years scientist decided (not all) it was not an official planet.
Technically, the planetary status of pluto is no longer a planet, but the term "planet" is simply a name. Scientists have decided that Pluto is no longer a planet mainly because it is just too small. Larger planetary objects have been discovered, and those are not considered planets, so just to keep things simple, Pluto is not considered a planet but as a large planetary object.
Neptune. It would be Pluto, but Pluto is a dwarf planet ( a planet that was a planet, but decided that it wasn't a planet)
Pluto, it is now a dwarf planet or planetoid.
Pluto is no longer considered a planet.
Neptune. It would be Pluto, but Pluto is a dwarf planet ( a planet that was a planet, but decided that it wasn't a planet)
Pluto is an object that is no longer a planet,Now it is a Dwarf Planet.Well it used to be a planet.
The recent discovery in astronomy, is that Pluto is no longer a planet. Because the mass of Pluto is far less than the mass of other planets in our solar system, they have decided to take the title "planet" away from Pluto. But because it is still much bigger than any meteor or astroide, they have decided to name it a sub-planet.
No, Pluto is no longer classified as a plant. It is now known as a dwarf planet.
No. The fifth planet is Jupiter. Pluto was once considered the ninth planet, but is no longer considered a planet.
"Planet X" was originally a term for a hypothetical TENTH planet, BEYOND Pluto. Also, Pluto is no longer considered a planet.
The size of planet Pluto is 1410 miles. But Pluto is now no longer a planet o body knows what actually happened at the precise time.