How is a planet classified a planet?

A planet was defined as anything that could be known to orbit the Sun and be larger than a specific amount.

When Ceres was first discovered, it was classified as a planet. Later, however, it was discovered that Ceres was actually an asteroid because it belonged to a group of objects that were classified as asteroids.

A problem arose when numerous objects, especially those found outside of Neptune, were discovered in more recent times: should they all be considered planets?

In 2006, the IAU issued a resolution that included certain definitions. A planet needs to meet three requirements:

Because Pluto failed to satisfy the third requirement, it was downgraded to a dwarf planet.

It's ironic that Jupiter may not satisfy the third requirement due to the large number of bodies in its orbit around the trojan points.

A planet is classified as a planet based on three main criteria: it orbits around the Sun, it has sufficient mass for its self-gravity to form a nearly round shape, and it has cleared its orbit of other debris.