Final answer:
To determine if a star is turning into a red giant, observe if the star's core shrinks, heats up, and causes its outer layers to expand, leading to the star becoming larger, brighter, and cooler, glowing red as it transitions into a red giant star.
Explanation:
When the hydrogen in the center of a star is depleted, the star's core shrinks and heats up, causing the outer part to expand. This expansion leads to the star becoming larger, brighter, and cooling, making it glow red and transforming into a red giant star. For example, Betelgeuse is a known red giant star.
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