Question

why pluto is called a dwarf planet

Answer 1

Pluto is known as dwarf planet because it's size is very small compare to other planets but it is larger than asteroid.

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^_^

Answer 2

In 2003, astronomers discovered a new object beyond Pluto that they named Eris. That discovery caused astronomers to talk about the defining characteristics of a planet. They decided that because of its size and location, Pluto, along with Eris, were not planets. Pluto, Eris, and objects like them are now classified as dwarf planets.