It appears that the Trappist-1 system - the one with all those exoplanets - has a problem.
Too much water.
It seems likely that the planets are all covered with global oceans - which, unfortunately, isn't good for thermoregulation and thus for life. It tends to stagnate the atmosphere. World oceans are a science fiction trope that doesn't work well in the real world.
We won't know for sure without going there...and that's not likely to happen any time soon, unfortunately.
(Still holding out for that warp drive).
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