In 2006, the International Astronomical Union concluded that Pluto does not meet the definition of “planet”. According to experts’ criteria, for a cosmic body to be considered a planet, it must revolve around the Sun, have an almost round shape, and clear the space around its orbit. Pluto does not fit the endpoint. The truth is that Pluto has no gravity. But they say Pluto dwarf planet.
Dwarf planets are small and do not correspond to the parameters characteristic of ordinary planets. Five such planets are known today. These are Ceres, Pluto, Eris, Makemake, Haumea.
Some experts disagree with the view of the International Astronomical Union. For this reason, Philip Metzger of the University of Central Florida in 2018 stated in his study that the current standard for classifying planets cannot be called scientifically sound. According to Metzger, an object should be named a planet based on its internal properties, not on the properties of its orbit.
Also, NASA’s Alan Stern noted that not all dwarf planets should be considered planets. This is because there are too many asteroids in the solar system, so not a single space object can clear its orbit around it.
Source: Ferra
