Question

Which event marks the beginning of a supernova?

a.The onset of helium burning after a helium flash.
b.The sudden collapse of an iron core into a compact ball of neutrons.
c.The sudden initiation of the CNO cycle.
d.The beginning of neon burning in an extremely massive star.

Answer 1

Answer:

The event that marks the beginning of a supernova is:

b. The sudden collapse of an iron core into a compact ball of neutrons.