The Life and “Death” of iPTF14hl

http://now.northropgrumman.com/zombie-star-diaries-the-life-and-death-of-

"Scientists found evidence of another supernova explosion at the same location back in 1954. Some experts suggest this could be evidence of “pulsational pair-instability supernova” theory, which suggests that massive stars could generate both matter and antimatter in their cores, in turn leading to a series of explosions before the final curtain call. The problem? Energy released by iPTF14hls is more than the theory predicts. As a result, there’s no good explanation (yet) for this ever-exploding zombie."