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Title: What happens to the helium-rich core of a star after the core runs out of hydrogen? Post by: doit_the_clown on Mar 19, 2017 What happens to the helium-rich core of a star after the core runs out of hydrogen?
A) It cools down and contracts. C) It heats up and expands. B) It expands and cools down. D) It contracts and heats up. Title: Re: What happens to the helium-rich core of a star after the core runs out of hydrogen? Post by: hyponotica on Mar 19, 2017 Content hidden
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