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This question already has an answer here:

How long would it take? Is it likely in the life of our sun?

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marked as duplicate by Kyle Oman, CuriousOne, Qmechanic Aug 5 '16 at 20:23

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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    $\begingroup$ Duplicate of physics.stackexchange.com/q/776 $\endgroup$ – user108787 Aug 5 '16 at 19:49
  • $\begingroup$ Arthur C Clarke's book 2010 talks about that. I wonder how accurate that is? $\endgroup$ – Bill Alsept Aug 5 '16 at 20:04