Chapter 1
The search for Planet X
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Chapter 2
The heart of Pluto
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Chapter 3
The weird worlds of the Kuiper Belt
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Chapter 4
The great planet debate
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Chapter 5
Beyond the icy frontier
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YOUR GOAL
Master of Pluto and the icy worlds of the Kuiper Belt
Ch 4 · The great planet debate
artiteacher The great planet debate
Out in the Kuiper Belt, Pluto's giant nitrogen heart is breathing wind across the ice!
Fun Fact
Plutoed slang term: In 2006, the American Dialect Society voted plutoed, meaning to demote or devalue something, as its Word of the Year.
Glossary
dwarf planet (noun)
A celestial body resembling a small planet but lacking certain technical criteria required to be classified as such. In 2006, the International Astronomical Union reclassified Pluto under this category, triggering intense global controversy.
A celestial body resembling a small planet but lacking certain technical criteria required to be classified as such. In 2006, the International Astronomical Union reclassified Pluto under this category, triggering intense global controversy.
Quiz
What category of celestial bodies was created in 2006 to classify Pluto and Ceres?