As a star like the Sun exhausts hydrogen in its core, the outer layers of the star become hotter and more luminous.

Name: As a star like the Sun exhausts hydrogen in its core, the outer layers of the star become hotter and more luminous.
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Question

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As a star like the Sun exhausts hydrogen in its core, it expands and cools on the surface, becoming a red giant, although the core itself becomes hotter, leading to the outer layers becoming more luminous due to the increased size, not because they are hotter.

As a Star Like the Sun Exhausts Hydrogen in Its