Pluto's 'almost twin' dwarf planet Eris is surprisingly squi

Pluto's 'almost twin' dwarf planet Eris has a rocky core blanketed by an icy shell, which appears to be flexing slowly.

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Chile , Greece , Greek , Mike Brown , Francis Nimmo , University Of California Santa Cruz , International Astronomical Union , Dwarf Planet Eris , Almost Perfect Pluto , California Santa Cruz ,