Post by James Nicoll
Red dwarfs and what to do about them
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Tidelock is only a major problem on worlds in near-circular orbits wit little or no axial tilt.
If, OTOH, its orbit is similar to Mercury's, then almost half its surface will be in the "Twilight Zone" where the sun rises and sets. If the orbital period is only a few days, then the solar day in this zone won't be unduly long.
Ditto for axial tilt. If this in 45 degrees or so, then close to half the world lies withing the polar regions, where again the day and night will each be abt half the orbital period.
Finally a lot of stars have Jupiter-type planets quite close in. If the rocky world orbits at ten million miles, and there's a Jupiter at about forty million, the latter's gravity might well give the former a slow retrograde rotation, hence a solar day about half of its year - which could be quite short.
Mike Stone, Peterborough, England.
Always drink upriver fom the herd.