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The passage discusses how Pluto was reclassified from a planet to a dwarf planet in 2006. The main idea is that astronomers came up with a new three-part definition for what qualifies as a planet, and Pluto did not meet one of the criteria - that a planet must have "cleared its neighborhood" of other objects in its orbit. Specifically, Pluto shares its orbit with many other rocky and icy objects that it cannot clear away. While Pluto

Author

Noelia Bibbo

Language

EN