Why did the scientists/astronomers accept then discard Pluto as one of the 9 major planets in the solar system?

I think Pluto is no longer treated as a planet under the Solar system. According to The International Astronomical Union (IAU), a celestial or astronomical body should fulfill the following requirements for being treated as a planet: 1. The object must orbit the sun.

The object cannot orbit another planet or another celestial object. The object can only be a satellite of the sun. 2.

The object must be a sphere. The self-gravity of the object must be strong enough to smooth out any ridges or bumps and become spherical in structure. 3.

The object must be cleared of its orbital neighborhood. There should be no other bodies in its orbit. During its formation, it must have already cleaned or absorbed any object or debris in its orbit except moons.In simpler terms, a planet should be the dominant gravitational body in its orbit.

When a planet comes across other smaller objects, the planet should either sling them away or consume them. As Pluto which was treated formerly as a planet doesn't meet these standards, the IAU classifies Pluto as a dwarf planet rather than a full-fledged planet.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.