Water on Mercury has been confirmed, or rather water ice likely deposited by asteroids, melted and rained down on the cold side, lots of it. So here's my question.
If Mercury has polar ice due to the north pole being permanently in shadow it seems to me likely that there are zones on Mercury that would be more temperate, intermediate zones, say on the slopes of craters. Would this not add a bit of a skepticism to the ideal of goldilocks zones being the only likely places to find planets with life? I see no reason why an entire planet would have to be habitable to support life as long as the habitable zones were reasonably stable or shifted slowly enough for life to survive any turbulence.