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 in a star with mass comparable to that of the Sun
C)the beginning of neon burning in an extremely massive star
D)the sudden outpouring of X- rays from a newly formed accretion disk
E)the expansion of a low- mass star into a red giant

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 triggers a massive release of energy that drives the explosion of the outer layers of the star.

Which Event Marks the Beginning of a Supernova