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2026
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Source-derived question
Why did Pluto fail to meet the IAU's new orbital-clearing criterion?
Dwarf Planets and Kuiper Belt
Sources that address it
Eris discovered, triggering Pluto's reclassification
almanac
Related questions
How did Chad Trujillo and Michael Brown detect and confirm Quaoar as a trans-Neptunian object?
How did Clyde Tombaugh's method of comparing photographic plates actually reveal Pluto's movement?
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How did bombarding uranium-238 with deuterons in a cyclotron produce a brand-new element?
How did the IAU's 2006 vote to reclassify Pluto as a dwarf planet provoke such widespread public reaction?
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How far is Quaoar from the sun, and how long does it take to complete one orbit?
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