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The Sun and Earth in the distant future Can we postpone the extinction

The Sun and Earth in the distant future Can we postpone the extinction of life? Options: terra-forming Mars? Space stations drifting out through the solar system? Colonise the Galaxy? None would save more than a tiny fraction of life on Earth Move the Earth itself outwards?! Serious proposal (Korycansky et al, Ap&SpSci, 275, 349, 2001) to use Kuiper Belt objects in close fly-by to nudge the Earth every 6000 years so that it moves out at just the right rate Energetically possible, and could be technically possible in the near future (a few centuries) Very dangerous! But could extend habitability of Earth for whole MS lifetime of Sun (~6 Gy) – a big gain.

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