Sentence:  Today, Xena is no longer Xena but has been officially renamed <WSD>Eris</WSD>, 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 <WSD>Eris</WSD> and Dysnomia have confirmed that <WSD>Eris</WSD> is 27 per cent more massive than Pluto, though of a similar diameter. 
Meaning of the word marked with <WSD> tags:  (Q611) The celestial body 136199 Eris, the most-massive known dwarf planet in the Solar System and the largest known object in the scattered disk; "formerly nicknamed Xena".