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If you mean the dwarf planet 136199 Eris then I can answer to the question. Eris has a rocky core and icy mantle like other large trans-Neptunian objects like 20000 Varuna, 28978 Ixion, 38628 Huya, 50000 Quaoar, 90377 Sedna, 90482 Orcus, 134340 Pluto, 136108 Haumea, 136472 Makemake and 225088 (2007 OR10) for example.

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14y ago

What else can I help you with?