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The distant Kuiper Belt dwarf planet is more massive than Pluto. The figure is taken from NASA Science, which is linked in full on this page. Every fact on Mondo Knows names its source rather than repeating an unsourced claim.

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Eris discovery prompted the reclassification of Pluto

The distant Kuiper Belt dwarf planet is more massive than Pluto

Discovered in 2005 beyond Neptune, Eris was found to be slightly smaller in diameter than Pluto but roughly 27 percent more massive. The discovery of an object rivaling Pluto forced astronomers to formalise the definition of a planet in 2006, placing both worlds into the dwarf planet category.

Where this comes from

NASA Science

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Tags: eris, pluto, dwarf planet

Eris discovery prompted the reclassification of Pluto: the short answers

Where does this come from, and can I check it?: The distant Kuiper Belt dwarf planet is more massive than Pluto. The figure is taken from NASA Science, which is linked in full on this page. Every fact on Mondo Knows names its source rather than repeating an unsourced claim.
Is this really a space fact?: Yes. It sits on the Space shelf, one of 1,090 sourced facts grouped into space, animals, the human body, history, science and more. Category pages collect every fact in the same field.
What else can I read about it?: The links under the fact point to a quiz, game, puzzle or calculator on the same subject, and the shelf below shows related facts. The wording here is original, and quoted phrases are marked as quotations.