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timeasmymeasure
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Date: 2021-05-22 04:26 pm (UTC)The Sun should be about 10% brighter than it is now. It might be a good idea to put a nice big station out at the L1 Lagrangian point with adjustable sunshading. On those timescales, moving a nice big asteroid there is feasible. It's about 3-4x the distance to Luna.
A billion years is a substantial time for evolution. Multicellular life is only about half that old. There will probably be several die-offs and superspeciation events in that time period.