How does Eris’s rocky interior differ from Pluto’s icy composition?

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Eris Possesses a Denser Rocky Core Compared to Pluto's Predominantly Icy Structure

Recent research indicates that the dwarf planet Eris has a rocky interior beneath an ice shell. In contrast, Pluto exhibits an icy exterior with rock beneath, but it contains a higher proportion of ice and is believed to possess a subterranean liquid ocean, a feature unlikely to exist within Eris. Eris's internal differentiation, where rock has settled to its centre, suggests it once reached temperatures high enough to melt its composition.
Internal Differentiation and Compositional Differences

Scientists have determined that Eris underwent a process where its rocky components sank to the core, implying a past molten state. This differentiation contrasts with Pluto, which is described as being "puffed up by ice" and is primarily composed of ice with rock underneath. Eris, conversely, is predominantly rock with an outer layer of ice.
Mass and Density Discrepancies

Due to its higher concentration of denser rock, Eris has approximately 25 per cent more mass than Pluto. While both celestial bodies are similar in size, with Eris having a diameter of about 1,445 miles (2,326 km) and Pluto slightly larger at 1,473 miles (2,370 km), Eris's greater rock content contributes to its higher mass.
Internal Activity and Ocean Potential

The ice shell on Eris is not static but is undergoing a slow churning motion, powered by residual internal heat. This internal activity leads researchers to believe that Eris likely does not harbour a liquid ocean. Pluto, however, with its higher ice content, is theorised to potentially contain such an ocean beneath its surface.

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How does Eris’s rocky interior differ from Pluto’s icy composition?

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