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

Respuesta :

I am pretty sure it is B because of its bigger surface area :)
zuesismyfurbaby

Answer:

B

Explanation:

The Sun's increased luminosity will heat the Earth's surface so much that the water oceans and atmosphere will evaporate away. Massive main sequence stars will expand much further to become supergiants.

HOPE I HELPED.

maybe i can get brainlist if did.:)

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