Thank you all very much for your continued help and discussion. I really appreciate it, and its been very educational for an amateur student of astronomy such as myself.
And I've learned something new: I never knew that comets can provide additional hydrogen to the sun. Thanks for posting that!
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Originally Posted by George
Can you think of other factors that might increase of decrease the life of our star?
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Well, I do recall that once the sun has used up its hydrogen supply, it will turn to fusing helium. If I recall correctly, this may allow the sun to continue to generate energy for another 100,000 years or so (don't quote me on that!) So, that is one factor that will increase the lifetime of our sun.