Today, Xena is no longer Xena but has been officially renamed Eris, after the Greek goddess of strife and discord—which hints at the climate in planetary science at the time. Its moon has a similarly appropriate name, Dysnomia (lawlessness) in Greek mythology, the daughter of Eris. Observations of Eris and Dysnomia have confirmed that Eris is 27 per cent more massive than Pluto, though of a similar diameter.