Question

after the supernova in a star’s life cycle, what else is formed in addition to a nebula?
red giant or protostar
neutron star or red giant
protostar or black hole
black hole or neutron star

Explanation:

When a massive star undergoes a supernova explosion, depending on its mass, it can form either a black - hole (if the mass is extremely large) or a neutron star. Red giants and protostars are formed at earlier stages in a star's life cycle, not after a supernova.

Answer:

D. black hole or neutron star