Answer:
Sample Response: 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.
Explanation:
Pluto is called a dwarf planet because it is not big enough to exert its orbital dominance.
This is defined as a large round celestial body in space which moves around a star.
Pluto isn't able to clear the neighborhood surrounding its orbit because it is not big enough to exert its orbital dominance.
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