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 ...

6, 2006, Pluto and the others were formally recategorized not as planets but as “dwarf planets” — objects ... A tiny moon, named Dysnomia after the mythological Eris’ daughter and the ...