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Why do red giant stars produce energy?

Answer 1

They have a lot of mass.

The same factor that causes all stars to produce energy is their mass; in the case of stars, this enormous mass results in a crushing gravitational force that is so strong that it actually causes particles to fuse, releasing energy and creating heavier elements.

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Answer 2

Alexander Acosta

In order to keep themselves stable and able to withstand gravitational collapse, red giant stars undergo nuclear fusion reactions in their cores. These reactions mainly involve the conversion of hydrogen into helium, which releases a large amount of energy in the form of heat and light.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.