8. Our sun is in which phase of its life? Nuclear fusion will burn all of the hydrogen in its core and then it will begin its next phase of life. Astronomers estimate this will be when?
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Main Sequence; 5 billion years
Protostar; 5 billion years
Main Sequence; 2 billion years
Red Giant; 5 billion years
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Our sun is currently in the Main Sequence phase of its life. Nuclear fusion will continue to burn all of the hydrogen in its core, and it is estimated that this process will continue for about 5 billion years before it transitions to the next phase of its life.
So the correct answer is: Main Sequence; 5 billion years.
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