If you don't know, this is the new name for the "Planet formerly known as Pluto." This will be a trivia question soon, so don't forget it. In other naming news, the rock in space that, in my opinion, got Pluto kicked out of the planet club, was also renamed. The "before" name was "2003 UB313" (by the International Astronomy Union). The "after" name is now Eris, after the Greek goddess of discord.
Here's the funny part. The nickname for "2003 UB313" was Xena, as in Xena: Warrior Princess, the TV show. I know this is not true, but to think that a television show had an impact on the universe, it makes me chuckle a little bit.
I think I have to let go of the "Pluto is a planet" thing. Time to move on.