The reason behind the fact that no main-sequence star with mass less than 0.4 M Θ has yet converted all of its hydrogen to helium, even if there is evidence that proves the universe is about 13.7 billion years old.

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Chapter 19, Problem 5Q

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The reason behind the fact that no main-sequence star with mass less than 0.4 MΘ has yet converted all of its hydrogen to helium, even if there is evidence that proves the universe is about 13.7 billion years old.

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