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Source-derived question
What new definition of 'planet' did the International Astronomical Union adopt in 2006?
Dwarf Planets and Kuiper Belt
Planetary Science
Sources that address it
Eris discovered, triggering Pluto's reclassification
almanac
Related questions
How did the discovery of Charon contribute to Pluto's 2006 reclassification as a dwarf planet?
What evidence led Percival Lowell to predict a ninth planet before Pluto was ever seen?
What orbital patterns in long-period comets led Jan Oort to propose a distant cometary reservoir?
What three criteria did the IAU's 2006 definition require for something to count as a planet?
Which specific criterion did Pluto fail to meet, and why?
Who proposed the name Pluto and why was it chosen?
Why was Pluto later reclassified in 2006, after seventy-six years as a planet?
How did Alan Hale and Thomas Bopp independently discover the same comet on the same night?