For 76 years, official astronomy believed that there were 9 full-fledged planets in the solar system, among which Pluto is the most distant from the Sun. But since 2006, it has been classified as «minor planets and asteroids.» The discovery of Ceres and Eris forced the scientists to revise the classification. They, like Pluto, have not yet cleared their orbit of foreign celestial bodies. In addition, Pluto cannot be considered the most massive body in its area. Therefore, despite the presence of an atmosphere and its own satellite, it is still not considered the ninth planet.
Why is Pluto no longer considered a planet?
