A solar mass star will evolve off the main sequence when:

Question

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A solar mass star will evolve off the main sequence once it builds up a core of inert helium. As the core shrinks and heats up, the outer layers of the star expand and cool down, causing the star to become a red giant. A solar mass star will evolve off the main sequence when it builds up a core of inert helium. This happens after the star has fused all of the hydrogen in its core into helium, creating a helium core that cannot fuse into heavier elements. As a result, the outer layers of the star start to expand and cool, causing the star to become a red giant.

A Solar Mass Star Will Evolve Off the Main Sequence