What happens to the core of a high-mass star after it runs out of hydrogen?
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What happens when a main-sequence star exhausts its core hydrogen fuel supply?
What happens when a star exhausts its core hydrogen supply?
A. Its core contracts, but its outer layers expand and the star becomes bigger and brighter.
B. It contracts, becoming smaller and dimmer.
C. It contracts, becoming hotter and brighter.
D. It expands, becoming bigger but dimmer.