8q4d
contestada

When a high-mass main sequence star runs out of both hydrogen and helium in its core, the core begins to fuse
.

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

Respuesta :

Answer:

Supernova

Explanation:

Stars have fixed lifespan. They are born and eventually die when they run out of fuel. An average mass star like sun ends of as white dwarf whereas a high mass star ends up as either neutron star or a blackhole. A high mass star when runs out of fuel first expands to become a supergiant red star and then blows of most of its mass on going supernova. The remnant core is either a neutron star or a blackhole.During supernova, all the heavy elements formed in fusion process is released.