Here's why some scientists think Pluto should still be a planet

Business Insider 2019-08-28

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Through the early 90's, Pluto was considered a planet. But everything changed after scientists discovered new worlds nearby that looked and behaved like Pluto, but unlike every other planet in our solar system. This caused astronomers to redefine what makes a planet a planet, and reclassify Pluto as a dwarf planet.

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