When astronomers found a large world farther out than Pluto, it became one of the final nails in the coffin of our ninth ...
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20 Years Ago This Week, The Planetary Downfall Of Pluto Began!It saw the discovery of dwarf planet Eris and how those very observations ... It has only one known Moon, called Dysnomia, and it orbits the Sun in just over 559 years. At its closest approach ...
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