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Stars spend about 90% of their fusion lifetimes on the main sequence.

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Q: How does the main-sequence lifetime of a star compare to its entire fusion lifetime?
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How does the source of the sun's energy compare with the process of nuclear fusion in the sun?

They are the same.


What part of th sun produces energy through nuclear fusion?

The entire sun does it. As long is it is hot enough, it will be causing nuclear fusion.


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Compare and contrast nuclear fission and nuclear fu sion?

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Compare the elements formed in the big bang with elements formed through nuclear fusion in stars?

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