Since all the Trappist-1 planets have circular orbits, it is entirely likely that all them are tidally locked.
If so, which ones of the planets may have temperate zones either on the bright or dark sides?
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2$\begingroup$ Different but related to this unique and resonant system: Just how “locked” are resonant-chains of exoplanets thought to be? (e.g. K2-138 and TOI-178) and Are the planets in the TRAPPIST-1 system so close that inhabitants on one planet could see surface details on the other planets? and How many things are wrong in this “artist view” of the TRAPPIST-1 system? Those are about orbital resonance, but this is about tidal locking. $\endgroup$– uhohApr 21, 2021 at 0:53
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