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science.nasa.gov | ||
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theconversation.com
In 2006, and after much debate, the International Astronomical Union came up with a new definition for a planet. And for the first time, the term "dwarf planet" was used. |
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spaceplace.nasa.gov
The icy bits past Neptune's orbit |
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www.space.com
Pluto isn't the only dwarf planet residing in our solar system. Try your hand at naming the others in our quiz! |
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blogs.nasa.gov
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