What is a Dwarf Planet?

A dwarf planet, or "dwarf planet", has a volume between planets and asteroids and orbits stars. Its mass is sufficient to overcome solid gravity to achieve hydrostatic equilibrium (near a sphere) shape. It does not empty other celestial bodies in its orbit. , And not a satellite.

On August 24, 2006
Dwarf planets are characterized by the outer mantle and the surface of which are composed of some low-melting compounds composed of frozen water and gas elements, and some of them are mixed with some rocky minerals composed of heavy element compounds, the thickness of which covers the radius of the star The proportion is relatively large, but the relative mass of the constellation is not large. There may be a core of rock within the main material component, which accounts for most of the celestial mass. The volume and total mass of the constellation are not large, and the average density is small. Some large planet moons also have this ice-dwarf-like structure, such as Europa, III, IV,
Resolution 6A of the 26th General Assembly of the International Astronomical Union recognizes that Pluto is
The upper and lower limits of the mass and size of dwarf planets are not regulated in the 5A resolution of the International Astronomical Union Member Conference.
The lower limit is whether it can be reached
name classification diameter quality
year 2006
The International Astronomical Union's Resolution 6a of 2006 considered that Pluto is a new type of prototype of the outer object of Neptune. Although this type of naming and exact nature has not yet been designated by the International Astronomical Union, it will be confirmed in the future; in the debate seeking conclusions, both pluton and plutonian were rejected and failed to pass.
On June 11, 2008, the executive committee of the International Astronomical Union announced a new term-quasi-dwarf planets, which is defined as: all dwarf planets outside Neptune are quasi-dwarf planets.
American scientists have discovered a new dwarf planet 2014 UZ224 outside Pluto in the solar system, and the American Asteroid Center has confirmed its existence.
University of Michigan professor of astronomy David Geddes told the National Public Radio (NPR) that according to the standards published by the International Astronomical Union, which will downgrade Pluto to a dwarf planet, the 2014 UZ224 should It is a dwarf planet, but it may be considered too small to be called a dwarf planet, which will eventually need to be determined by the federation. [3]

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