| NOUN | object | Sedna | a planetoid of rock and ice about three-quarters the size of Pluto discovered in 2003 |
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| Meaning | A planetoid of rock and ice about three-quarters the size of Pluto discovered in 2003; the most distant object known to orbit around the sun. | |
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| Instance of | minor planet, planetoid | Any of numerous small celestial bodies that move around the sun |
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