Ravn0s writes "Pluto, subject of much controversy since it's discovery, has now been demoted from a planet. The Rose Center for Earth and Space, which opened last year at the American Museum of Natural History in New York is now saying that Pluto is not necessarily a planet at all but just a smallish lump of ice. Essentially, Pluto is now a largish comet. Details in this article." Other groups disagree, as the article points out.