Is Pluto still a big planet in the solar system? Are there still nine planets?

Draft one

Three conditions must be met to determine the eight "planets": celestial bodies should revolve around the sun; With enough mass, it can rely on its own gravity and make its shape approximate to a sphere through hydrostatic balance; This celestial body plays a leading role in the revolution area and is not disturbed by the adjacent celestial bodies in orbit. According to this plan, Venus, Saturn, Jupiter, Mercury, Earth, Mars, Uranus and Neptune are the eight planets in the solar system. A dwarf planet must meet four conditions: the celestial body should revolve around the sun; With enough mass, it can rely on its own gravity and make its shape approximate to a sphere through hydrostatic balance; This celestial body does not play a leading role in the revolution area and is interfered by the adjacent celestial bodies in orbit; Celestial bodies are not satellites. Accordingly, Pluto, Ceres, Ka Rong and 2003UB3 13 (Zena) will be classified as dwarf planets. The International Astronomical Union (IAU) will establish a project to evaluate the objects near dwarf planets and other classification boundaries. In addition, all other celestial bodies revolving around the sun are called "small celestial bodies in the solar system", such as comets and asteroids.

Draft II

Determine the "classic planet" change the "planet" in the first draft to "classic planet", and everything else is the same. According to this plan, Venus, Saturn, Jupiter, Mercury, Earth, Mars, Uranus and Neptune are the eight classic planets in the solar system.

Draft III

Identify new celestial bodies. Based on the definition of Pluto's dwarf planet in draft I and draft II, it is determined as the embryonic form of a new class of overseas celestial bodies.

Draft IV

On the basis of draft 3, the name of the new celestial body is determined. The prototype of this celestial body is called "Pluto-like celestial body".