If someone were to ask you to name the ninth largest object that directly orbits our sun, odds are you would respond with Pluto. After all, even if you can't call Pluto a planet anymore, it's still the ninth biggest rock in local solar neighborhood, right? Actually, no. The ninth biggest rock directly orbiting the sun is Eris, a dwarf planet named for the Greek goddess of discord. Considering how much disagreement was engendered by the discovery of Eris and her sibling dwarf planets, there's probably no better mythological namesake for this local celestial object.
You see, lots of folks are still bent out of shape that Pluto was demoted from actual planet to dwarf planet. Fan though I am of that most famous of trans-Neptunian objects, Pluto's claim to planethood was shaky at best. Besides being outsized by Eris, Pluto is actually smaller than seven moons in the local solar system. Its orbit is rather eccentric, slipping occasionally closer to the sun than Neptune before swinging further away again. In fact, Pluto was in many respects considered a planet simply because it was found during Percival Lowell's attempts to locate the mythical Planet X beyond Neptune, and because initial estimates of its size were far larger than Pluto's true mass. Put another way, Pluto earned planet status mostly because it was found at the right time and by the right people, who made the right mass-estimate mistakes.
Still, some argue that because Pluto was considered a planet for so long — more than 75 years — it should be grandfathered into the planet club. That notion breaks down when you cite the Ceres precedent. Asteroid Ceres was listed as a planet for more than 50 years, mostly because no one knew what else to call it. Ceres led directly to the coining of the term asteroid to describe sub-planetary rocks of significant size, a title it inherited once it was stricken from the roster of planets. Because of Eris, Pluto went through the same it's-not-really-a-planet-so-let's-invent-a-new-category process, giving us dwarf planets.
So, if Eris stirred up such an astronomical hornet's nest, why haven't you heard of it? Actually, you probably have. For a long while, Eris was listed by its minor planet name, 2003 UB313. That catalogue number was a little cumbersome, so the discovery team nicknamed it Xena, after the famous fictional warrior princess portrayed on television by Lucy Lawless. (Yes, many astronomers are sci-fi/fantasy geeks. Duh.) The Xena title got a lot of media play, as did the nickname Lila. Funny thing is, nobody ever actually called 2003 UB313 Lila, despite media reports to the contrary. It was all just a rather comical misunderstanding bred by ignorance of — believe it or not — the Internet.
WHAT INTERNET-RELATED MISTAKE LED TO THE DWARF PLANET ERIS BEING MISLABELED AS LILA IN NEWS REPORTS?Get the answer.
Jay Garmon has a vast and terrifying knowledge of all things obscure, obtuse, and irrelevant. One day, he hopes to write science fiction, but for now he'll settle for something stranger — amusing and abusing IT pros. Read his full profile. You can also follow him on his personal blog.