How does a supernova occur?

Supernova occurs when black holes stretch so much running out of nuclear fuel. When a star collapses to form a black hole, its mass increases. Supernovas have greater masses than black holes. One example application of this is the theory of Big Bang. From theories such as Ekpyrotic theory, White Holes, Matrix theory, and Quantum theory, the Big Bang theory is the theory mostly accepted by scientists. According to the theory, the universe started as a singularity, that is, from a black hole under extreme gravitational pressure and expanded (instead of exploded) and cooled. Its cooling, according to the theory, is still happening now as of the moment.