Clyde Tombaugh discovered Pluto in 1930 at Lowell Observatory in Flagstaff. Here's how Pluto won - and lost - its planetary ...
If you answered "Pluto's planethood," your grasp ... satisfy one of three newly defined criteria to be a planet. They were: The body must orbit its host star, just as Earth and Jupiter orbit ...
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Is Pluto a planet or not? Who cares! Our love for the King of the Kuiper Belt is stronger than ever 95 years laterPluto fails the third criterion because its orbit overlaps with objects in the Kuiper Belt, a region of icy bodies beyond Neptune. So, a new class of celestial object — the dwarf planet — came ...
The International Astronomical Union reclassified Pluto as a dwarf planet because it does not clear its orbit of other debris. Pluto was the little planet that could — until it couldn’t.
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