Eris is bigger and heavier than our Solar System's 'ninth planet'.
References
Brown M. E. & Schaller E. L. Science, 316. 1585 (2007).
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Sanderson, K. Dwarf planet found to be heftier than Pluto. Nature (2007). https://doi.org/10.1038/news070611-10
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DOI: https://doi.org/10.1038/news070611-10
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