What is a Red Giant?

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(B) Red Giant is a luminous giant star of low or intermediate mass in a late phase of stellar evolution. As the star exhausts the hydrogen fuel in its

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$A$ dying star in the late stages of stellar evolution.

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(B) Red Giant is a luminous giant star of low or intermediate mass in a late phase of stellar evolution. As the star exhausts the hydrogen fuel in its core,the core contracts and heats up,causing the outer layers of the star to expand and cool. This expansion gives the star a reddish appearance and a significantly larger radius compared to its main-sequence phase. Therefore,it is a dying star that has moved off the main sequence.

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