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When the sun has fused all of the hydrogen atoms into helium atoms
it will be finished. It would then start to cool and expand. Unfortunately
we think it would expand out beyond earth's orbit. We would be cooked.
This is not expected to happen for millions of years. It is hard
to think that humans will still be around. We will have left or
may not have survived. Nothing to worry about for the next several
million years.
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