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· Pluto, large, distant member of the solar system that formerly was regarded as the outermost and smallest planet. In a group of experts in the scientific community voted to give Pluto the new classification of dwarf planet. Learn more about Pluto in this article. · Pluto, from the perspective of an astronomer, was never a planet at all. But the Universe, no matter how you classify the objects within it, is all the richer on account of the rocky and icy. · Pluto, once considered the ninth and most distant planet from the sun, is now the largest known dwarf planet in the solar system. It is also one of the . Geerweg 46, Ter Aar · km · Pluto was reclassified from a planet to a dwarf planet in This is when the IAU formalised the definition of a planet as “A planet is a celestial body that (a) is in orbit around the Sun, (b) has sufficient mass for its self-gravity to overcome rigid body forces so that it assumes a hydrostatic equilibrium (nearly round) shape, and (c) has cleared the neighbourhood around its orbit.”. Pluto is the largest known dwarf planet in the Solar System, discovered in It was thought to be the 9 th planet of our system for 75 years until the discovery of Eris and other similar objects that led to its demotion from a planet to a dwarf planet in Key Facts & Summary. It was the first Kuiper Belt object to be discovered and is the largest known plutoid. Pluto is categorized as a dwarf planet. In , Pluto was categorized with three other objects in the solar system that are about the same small size as Pluto: Ceres, Makemake and aktionscampus.de objects, along with Pluto, are much smaller than the "other" planets. Prof Owen Gingerich of Harvard, who chaired the planet definition committee, revealed that only 10% of the 2, scientists who had attended the day meeting were present at the Pluto vote. · Pluto is a dwarf planet that lies in the Kuiper Belt, an area full of icy bodies and other dwarf planets out past Neptune. Pluto is very small, only about half the width of the United States and its biggest moon Charon is about half the size of Pluto.. Almost all the planets travel around the Sun in nearly perfect circles. But not Pluto. It takes an oval-shaped path with the Sun nowhere near. Pluto is a dwarf planet in the Solar System. Its formal name is aktionscampus.de dwarf planet is the ninth largest body that moves around the aktionscampus.de first, Pluto was called a planet. Now, it is the largest body in the Kuiper belt.. Like other members of the Kuiper belt, Pluto . About Pluto. For those of us who grew up learning about 9 planets, was a sad year. In , the International Astronomical Union (IAU) officially stripped Pluto of its status as our solar system’s 9th planet. Pluto is now technically classified as a “dwarf planet” because it does not meet all 3 of the IAU’s criteria for planet status.