The definition of red giant star, the conditions that lead to its formation and the reason behind a red giant becoming brighter than it was as a main sequence star, if it now has a lower surface temperature.

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Chapter 14, Problem 18QFT

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The definition of red giant star, the conditions that lead to its formation and the reason behind a red giant becoming brighter than it was as a main sequence star, if it now has a lower surface temperature.

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