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Will Earth drift outside of the Goldilocks zone in the next half-billion years?

Ignoring debates about what constitutes the "Goldilocks zone", the issue of the Earth-Sun (AU) distance change is not terribly settled either. Howard appears to be using data from a somewhat ...
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Will Earth drift outside of the Goldilocks zone in the next half-billion years?

The Sun is a g2v main-sequence star with a lifetime of approximately 10 billion years. We're about half-way to its expiration date. Half a billion years, is 1/20th of its lifetime and there is little ...
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