From space.com:
"Astronomers know that over the next few billion years, the sun will swell so large as to envelop Earth. If we're still here, we will probably fry and the planet will be vaporized. There's a chance, however, that the changing mass of the sun will cause Earth to move into a more distant and pleasant orbit. One mathematical calculation shows it would be theoretically possible for humans to engineer such a move before it's too late."
Whew. For a bit there, I was worried.
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