What happens when a star exhausts its core hydrogen supply?
a. It contracts, becoming smaller and dimmer.
b It contracts, becoming hotter and brighter.
c. It expands, becoming bigger but dimmer.
d. Its core contracts, but its outer layers expand and the star becomes bigger and brighter.
e. Its core contracts, but its outer layers expand and the star becomes bigger but cooler and therefore remains at the same brightness.
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What happens when a star exhausts its core hydrogen supply?
a. It contracts, becoming smaller...
a. It contracts, becoming smaller...
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