NASA's New Horizon spacecraft flew past Pluto, once known as the world's smallest planet, in July 2015, and the encounter created history. In 2006, the International Astronomical Union (IAU) announced an announcement to redefine the word "planet". The redefinition eliminated many objects that included Pluto. Scientists now think that the decision was incorrect and a more useful and logical definition of the word "planet" would encompass many more worlds.
As said by the planetary scientists, they spend a long time researching and exploring the objects orbiting the stars, and they use the word "planet" to define any world that has these properties. If you observe a world like Pluto with many similar features like nitrogen glaciers, icy mountains, and blue skies with smog layers, scientists can not stop calling for "planets" to describe and / or compare it to the other known planet.
Scientists even use the word "planet" to describe the largest "moons" in our solar system. The word "moon" indicates that they revolve around the other worlds that are themselves turning our star. However, if another world like that of Saturn ̵
These findings forced us to ask what objects found in the orbit of the other stars could be called planets, some of which are almost stars themselves and are known as "dwarf stars" and it makes sense somewhere, tiny ones To bring ice worlds like Pluto into another subcategory called "dwarf planet".