It was on this day, the 14th of November, in 2003 that astronomers discovered 90377 Sedna. It’s a dwarf planet. “Dwarf planets” are one of a three-part categorization offered by Alan Stern, one of the premier scientists concerned with the matter. In his scheme there are “classic planets,” “dwarf planets,” and “satellite planets.” While this categorization has some compelling logic behind it, and is in partial use, as yet it is not fully recognized by the International... Read more