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2026
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Source-derived question
Who discovered Eris, and why did its mass relative to Pluto create a classification problem?
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?
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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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