Why is Pluto not accepted as being a planet?

First, lets gain some perspective on how small Pluto really is. It measures at just under 1500 miles in diameter. That's roughly the length of Greenland from north to south. read more

At that time the number of planets was nine. But later, in a proper manner, Pluto was unanimously excluded from Planet List in 2006. Although the Pluto planet will not be there, the debate has not yet ended. A few days back, Pluto was discussed as a plan to rebuild the planet but eventually Pluto did not return to the planet's status. read more

Pluto participates in being a planet to the extent that its spherical shape and solar orbit are the physical manifestation of the Universal Ideas of Being a Planet. AND Pluto participates in not being a Planet to the extent that it’s mass is not sufficient for it to clear it’s orbit of other Kuiper objects. read more

Third, direction of orbit. We've seen super Earths orbit the wrong way, and super Jupiters. We can't call those dwarf planets! Pluto's orbit is consistent with it being a very ancient planetary body. So, Pluto's “oddities” can be pinned down to Jupiter, Pluto and maybe Neptune being the three oldest planetary bodies. Saturn and Uranus formed second. read more