The red giant stage occurs after the main sequence stage in a star’s lifetime. When a star runs out of its nuclear fuel, it grows to be many hundreds of times its original size and cools, making it appear red.
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RED GIANTThe red giant stage occurs after the main sequence stage in a star’s lifetime. When a star runs out of its nuclear fuel, it grows to be many hundreds of times its original size and cools, making it appear red.