The discovery of Eris, a Kuiper belt object larger than Pluto, led to Pluto's demotion from a planet to a dwarf planet. Now Eris is back, smaller than before, but still causing trouble – November 26, 2010
The discovery of Eris, a Kuiper belt object larger than Pluto, led to Pluto's demotion from a planet to a dwarf planet. Now Eris is back, smaller than before, but still causing trouble – November 26, 2010
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