Which event marks the beginning of a supernova?
A)the sudden collapse of an iron core into a compact ball of neutrons
B)the sudden initiation of the CNO cycle
C)the onset of helium burning after a helium flash
D)the beginning of neon burning in an extremely massive star

Question

Quizplus · Accepted Answer

The sudden collapse of an iron core into a compact ball of neutrons marks the beginning of a supernova. This collapse causes the core to exceed the Chandrasekhar limit, leading to a runaway fusion reaction and the eventual explosion of the star.

Which Event Marks the Beginning of a Supernova