In a Supernova Like SN1987A, Once the Crisis of Iron

question 20

Multiple Choice

In a supernova like SN1987A, once the crisis of iron fusion has begun, roughly how long does it take the star's core to collapse?

• A) 10 million years
• B) 10 thousand years
• C) a hundred years
• D) one year
• E) a few tenths of a second

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