Meeting in Prague in 2006 International Astronomical Union, has created new regulations about what is a planet and what is not, and Pluto About twenty years after this decision, astronomers changed the definition of planet again.

Under the new regulations, planets will now be evaluated based on their mass. on July 17 proposed a new planet definition in August International Astronomical Union will be evaluated during the meeting. Because mass will be added to the existing definition, Pluto will continue to be called a dwarf planet.

How are planets determined?

To identify an object as a planet, astronomers are currently working three different criteria looking for. These criteria are as follows:

• revolve around the sun
• Ability to create enough gravity to form a round shape
• It wipes out the celestial bodies around it, except for satellites or moons.

from the University of British Columbia Astronomer Brett Gladman, “The problem in the past was that you had a word called planet, but it had no quantitative definition,” he said. Gladman stated that there may be problems in determining the planets due to the lack of a quantitative definition.

Interestingly, the definition of planet does not fit most planets. For example, Jupiter and Earth It has orbits that often cross with meteors. The celestial bodies we have discovered in other galaxies do not orbit the sun. Roundness The topic also attracts attention as a highly controversial and ambiguous topic. That is why researchers use data to classify similar objects to create an unbiased description. unsupervised clustering They used management. This method also did not include Pluto as one of the planets. The mass limit was chosen as 131×10^20 kilograms.