What is the critical mass threshold the iron core must surpass to trigger a standard core-collapse supernova?
Answer
Approximately $1.44 M_ ext{ extdollar}$ (The Chandrasekhar Limit)
The direct trigger for collapse occurs when the iron core surpasses the Chandrasekhar Limit, which is roughly $1.44$ solar masses, at which point electron degeneracy pressure can no longer counteract gravity.
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