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The Sun's Temperature

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Do you think the Sun is gradually getting hotter or gradually cooler? Give a scientific explanation for the trend? If and when the Sun becomes a red giant star will it's Luminosity increase or decrease from today?

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Solution Summary

This solution discusses whether or not the Sun is getting hotter or cooler.

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As the star exhausts its hydrogen fuel, the rate of which nuclear fusion occurs decreases, hence the star becomes colder. The outer shells start to collapse under the star's own gravity. As they fall into the star, the outer layer hydrogen heats up.

The core of the star however, heats up dramatically due to the extreme gravity and starts ...

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