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

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 creates a shockwave that causes the outer layers of the star to explode in a massive explosion.

Which Event Marks the Beginning of a Supernova