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What is a red giant star?

Answer 1

A red giant star is a dying star in the last stages of stellar evolution.

In only a few billion years (estimated), our own sun will turn into a red giant star, expand and engulf the inner planets, destroying the planets closest to it.

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Answer 2

Nova Adams

A red giant star is a late-stage star in its evolutionary process that is distinguished by its size, low temperature, and red color. Red giants are usually hundreds to thousands of times larger than the Sun and can be tens of thousands of times brighter. They arise when a star similar to the Sun runs out of hydrogen fuel in its core and begins to burn helium, which causes the star's outer layers to expand.

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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.