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Why would we want to...by the time the Sun starts to expand as a red giant, the Earth will have already been a dead planet for a very long time.
We also seriously underestimate just how advanced we will be if we manage to last that long....5 billion years, think about it. Scientist by and large have rather limited imaginations. Using asteroids to shift the Earth's orbit...how prosaic and unimaginative can you be.
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