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http://www.universetoday.com/2008/01/31 … red-giant/
Over the next 7 billion years the habitable zone of the solar system will slowly shift from 0.95-1.4 AU out to 50-70 AU, visiting each planet in turn.
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7 billion years? The Sun has 5.5 billion years left till it dies completely, or so I've been told.
'cept all that goes against what humans might do.
Use what is abundant and build to last
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The paper referenced by the article says 7.7 billion until the peak of the red giant phase, 3 billion until the Sun swallows the Earth, and 1 billion until the Sun grows bright enough to boil Earth's oceans.
After the red giant phase the Sun will cool to a white dwarf, which can probably be thought of as its death.
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