20 years ago, the discovery of Eris spelled doom for planet Pluto

Eight billion miles (14 billion kilometers) from Earth, at the solar system’s ragged edge, lies Eris — a planet-sized oddball of a world that emerged unexpectedly from the darkness 20 years ago. Named for the capricious Greek goddess of discord, trouble-stirring Eris would doubtless be pleased that her celestial namesake caused even mild-mannered astronomers toContinue reading “20 years ago, the discovery of Eris spelled doom for planet Pluto”
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