How can cool red giant be more luminous than a warmer main sequence star?
a) It is not possible for a cool red giant to be more luminous than a warmer main sequence star.
b) The red giant will be more luminous if it is smaller than the main sequence star.
c) The red giant will be more luminous if it is bigger than the main sequence star.
d) Cool red giants are always more luminous than a warmer main sequence star because they give off more energy.
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