From Centauri Dreams

It may be a stretch to imagine BD planets with sentient life, but it's fascinating to ponder "invisible" solar systems, that might be surprisingly close.

It’d be interesting to come up with some scenarios for evolution on such a planet whose star decreases in luminosity as it ages (as opposed to more conventional stars that brighten as they age) – perhaps life might begin in the cloud layers of an initially Venus-like planet, moving to the surface as the atmosphere cools and the oceans rain out of the atmosphere, and finally moving to a more Europa-like state with the oceans frozen under an ice layer.

Now that’s a chewy science fiction scenario for the writers who frequent these pages to work on.