Question

what happens during the life cycle of a star with one stellar mass?

Answer 1

Answer:

Stage 5 - A star of one solar mass remains in main sequence for about 10 billion years, until all of the hydrogen has fused to form helium.

Stage 6 - The helium core now starts to contract further and reactions begin to occur in a shell around the core.

Answer 2

Answer:

a star with 2-3 stellar masses would become a red supergiant

then a supernova and then become a neutron star.