It was called SN 2006gy it was 150 times the size of our sun.In just 2 months it emitted more radiation then our sun will ever emit. The explosion produced more light then the galaxy it came from. Because of the stars unusually large size the accepted theory of star death doesn't work. In this case it seems that the stars core was unusually hot. They suppose that the heat caused the gamma rays within the core to destroy each other. Gamma rays are the only things that hold the star together so there destruction caused the explosion.
Kyle and Eli