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What is believed to be the usual process which causes the actual explosion in a type II supernova ...

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What is believed to be the usual process which causes the actual explosion in a type II supernova ...

What is believed to be the usual process which causes the actual explosion in a type II supernova (massive star exploding)?

(a)   The core collapses inwards gravitationally until it has the density of an atomic nucleus, and then rebounds. The envelope collapsing against this rebounding core then explodes outwards.
(b)   The core collapses inwards gravitationally to become a black hole. The envelope collapsing inwards towards this black hole is heated to the point that catastrophic nuclear reactions begin in it, explosively ejecting the envelope.
(c)   Explosive nuclear reactions begin in the core when the central temperature reaches about 109 K, disrupting the entire star.

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Discovering the Universe

Edition: 7^th

Authors: Kaufmann, Comins

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Only two things are infinite, the universe and human stupidity, and I'm not sure about the former.

Albert Einstein

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