A recently-observed supernova is making some astrophysicists doubt prevailing theories for how stars die. The massive star, located in galaxy UGC 4904 about 77 million light-years from Earth in the constellation Lynx, threw off a huge amount of material on October 20, 2004. This star, which may have been what's known as a Luminous Blue Variable (LBV), was mistaken for a supernova, as LBV's often are. In fact, some observers refer to them as "supernova imposters." Then, in the fall of 2006, the star exploded into a full supernova, much sooner than expected. Dubbed Supernova 2006jc, the dying star's blast...