Yes, except that planets are not determined 'directly' by mass or size. But the actual requirement that a planet "clears its orbital neighborhood of other objects" (IAU, 2006) is necessarily a result of a singularly massive body.
No. "Planet X" is a temporary, basically meaningless, designation for a planet, given until the planet can be assigned a proper name. It does not refer to any specific planet. For a while, Pluto was referred to as 'Planet X.' However, the title may be given to any type of planet.
no, they are dwarf planets. Pluto is not a planet, it is a dwarf planet. The difference is that dwarf planets have an eccentric or elliptical orbit, and that they are small. the dwarf planets in our solar system are kuiper belt objects.
Pluto
No, because Pluto is no longer a planet because it's orbit sometimes crosses Neptune's(no planetary orbits cross over each other.
---- Saturn is a planet, the only dwarf planet is pluto. ---- It's a gas giant!
In order from least to greatest in mean radius:Vesta (protoplanet)Pallas (protoplanet)Charon+ (dwarf planet)Orcus (dwarf planet)Quaoar (dwarf planet)Ceres (dwarf planet)Sedna (dwarf planet)"Snow White" [2007 OR10]* (dwarf planet)Haumea* (dwarf planet)Makemake (dwarf planet)Pluto+ (dwarf planet)Eris (dwarf planet)Mercury (terrestrial planet)Mars (terrestrial planet)Venus (terrestrial planet)Earth (terrestrial planet)Neptune (ice giant)Uranus (ice giant)Saturn (gas giant)Jupiter (gas giant)*There is a slight discrepancy as to how Haumea ought to be measured, due to its unusual shape. This makes it slightly unclear as to which is considered larger between Haumea and "Snow White."+Binary planet
The position of the planets are, in order from the Sun: Mercury, Venus, Earth, Mars, Ceres [dwarf planet], Jupiter, Saturn, Uranus, Neptune, Pluto [dwarf planet], Haumea [dwarf planet], Makemake [dwarf planet] and Eris [dwarf planet].
Eris
No, Uranus is still considered a planet. Pluto has been the only planet so far down graded to dwarf planet status.
The dwarf planet Pluto.The dwarf planet Pluto.The dwarf planet Pluto.The dwarf planet Pluto.
Pluto the dwarf planet is an example of of a dwarf planet.
A dwarf planet it used to a be a planet
Mercury is not a dwarf planet. It is a planet.
dwarf is a dwarf planet because it is to small to be in the solar system.,
Its still a dwarf planet
Pluto is referred to as dwarf planet.
Ceres is a dwarf planet. There is no such thing as a gas dwarf planet - Yet!
Hiʻiaka is the larger, outer moon of the dwarf planet Haumea.It is NOT a dwarf planet.
Quaoar is an official dwarf planet.
That planet, a dwarf, is called Pluto.
It was a planet until 2006, it is now designated a dwarf planet