The so-called 10th planet – which was discovered on January 5, 2005, and which caused the demotion of [[Pluto]] to dwarf planet status – was officially named Eris on September 13, 2006. The name was suggested because this dwarf planet, like its Greek namesake, caused much discord and strife among the astronomical community.<ref>[http://www.gps.caltech.edu/~mbrown/planetlila/ Eris Named]</ref> | The so-called 10th planet – which was discovered on January 5, 2005, and which caused the demotion of [[Pluto]] to dwarf planet status – was officially named Eris on September 13, 2006. The name was suggested because this dwarf planet, like its Greek namesake, caused much discord and strife among the astronomical community.<ref>[http://www.gps.caltech.edu/~mbrown/planetlila/ Eris Named]</ref> |