What occurs in a massive star to cause it to explode?

What occurs in a massive star to cause it to explode?What occurs in a massive star to cause it to explode?Basically every star maintains a careful balance between the pressure of the gases it releases and it's own gravitational force, when the star runs out of energy to sustain the balanced state it somewhat implodes on its core, causing a plume of fire to come out of one of the poles, this fire plume travels to the opposite pole and reenters, causing the supernovaWhat occurs in a massive star to cause it to explode?The standard answer is that, once that star has reached a point where it has used up most of the fuel in its core, it can no longer maintain the heat output, formerly producing the pressure which supported the outer layers, which then collapse inwards, gravitationally, until they reach the point of incompressibility: with the resulting shock wave causing the supernova. However, I have always wondered if there is more to it than that. There is a lot of unused fuel in those outer layers, and the huge increase in temperature, as it all collapses (like a diesel engine) may well reach the point of detonation, where nuclear re-ignition occurs, in a very limited volume, converting a large amount of matter into energy, in a very short time, in the shell surrounding the already collapsed, incompressible core, and this adds to the force of that explosion, which can provide sufficient energy to accelerate the ejected material to a high percentage of the speed of light.What occurs in a massive star to cause it to explode?Temperature inside gets too high, raising the pressure of its innards to a point that its gravitational field cannot hold it in any more.

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