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kyaramarie318 kyaramarie318
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A month ago

What happens to cores of main-sequence stars as they age?



They cool down because they run out of hydrogen fuel.



They cool down because they expand.



They heat up because they contract.



They heat up because helium is more tightly bound than hydrogen.

Textbook 
ASTRO

ASTRO


Edition: 3rd
Authors:
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ecunis1ecunis1
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A month ago
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kyaramarie318 Author
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A month ago
Smart ... Thanks!
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You make an excellent tutor!
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2 hours ago
Just got PERFECT on my quiz
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