Before a billion years are up and our sun expands to become
a red giant and incinerates the inner planets we will hopefully have figured
out how to move those inner planets, including Earth, out to a safe distance.
Why not just save Earth? Venus is to be terraformed. Would moving
Venus further away from the sun help to bring about an end to its runaway
greenhouse effect? Or is removing the carbon dioxide more important than reducing the planetary temperature?
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