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Home Q & A Board Science-Related Homework Help Physics
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barry barry
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10 years ago
How has the chemical composition of the core of the Sun changed in the past 4.5 billion years?  Are earthlings (if any) likely to freeze in another 4-5 billion years?  Explain.
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doseofmegandoseofmegan
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10 years ago
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barry Author
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#2
10 years ago
Thanks Smiling Face with Open Mouth
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#3
10 years ago
The core of the Sun had an initial composition of 90% hydrogen and 9% helium.  As hydrogen fusion has continued over the past 4.5 billion years the amount of helium produced has steadily increased.  The center of the core now has about 85% helium and very little hydrogen.  As a main sequence star the Sun will continue to brighten slowly.  In another 4-5 billion years the Sun will have a core dominated by helium.  This will force it to change into a red giant.  Therefore, the Sun will only continue to brighten over time and the Earth will only get hotter, never colder.
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Eric Clapton
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#4
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2 years ago
Sun continues burn hydrogen into helium in its core, hence core has less hydrogen and more helium.
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