Comment Re:Slow Down (Score 1) 117
That's surface temperature. This ocean is deep under the surface.
So the follow-up question would be: if it's deep under the surface, how will sunlight get there?
The answer is that sunlight isn't what's needed, it's the right amount of energy that's needed. The energy can come from a lot of other places. Tidal forces for example can heat the interior of the moon, radioactive decay can heat the core of a moon etc. so there may be quite a bit of subsurface energy. For example, if you look at the bottom of the oceans on Earth where there is no sunlight, there are oases of life around volcanic vents on the ocean floor (which are spewing all kinds of useful chemicals into the environment). So while the surface might be cold and lifeless, it's possible that there are significant amounts of subsurface liquid water at a temperature that's compatible with life of some description.