At which stage in a Sun-like star's life is its core the least dense?

Name: At which stage in a Sun-like star's life is its core the least dense?
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Question

Quizplus · Accepted Answer

During the Main Sequence stage, a Sun-like star fuses hydrogen into helium in its core, which is less dense compared to later stages where the core contracts and temperatures and densities increase to enable fusion of heavier elements or the star becomes a compact white dwarf.

At Which Stage in a Sun-Like Star's Life Is Its