Question

When nuclear fusion ends in a high-mass star, the heavy elements formed in the star’s core are released through a

Answer 1

Once the universe was created by the Big Bang, the only abundant elements present ... by which a star"shines" higher mass elements were formed inside the stars. ... a star to shrink and collapse, but the energy released by nuclear reactions .... increase the fusion rates in the core and the surrounding shells, thus using up ...

Answer 2

The answer is a supernova.