Main-sequence stars have about the same density as the Sun but giant stars have very low densities.

Name: Main-sequence stars have about the same density as the Sun but giant stars have very low densities.
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Main-sequence stars, like the Sun, share similar densities due to their similar states of nuclear fusion and structure. Giant stars, however, have expanded outer layers and a relatively small core, leading to much lower overall densities.

Main-Sequence Stars Have About the Same Density as the Sun