Eris, the greek goddess of chaos and strife, is the new official name of that dwarf planet found last year that caused Pluto to lose its full-fledged planetary status. Previously catalogued as 2003 UB 313 and nicknamed Xena, the official name is appropriate given that the planet we know and love as Pluto was then downgraded to dwarf planet as a result of the find and the debate about it.