It's not really a new insight that planetary bodies outside the "habitable zone" can have large bodies of liquid water. The moon Europa, orbiting Jupiter, is known to have an ice-covered ocean for quite a while now. The reason for the liquid water are graviational effects, kind of like squashing a tennis ball. But there are many other reasons such a body might be warm enough for water to be liquid.<p>Anyway, contemplating extremophiles (lifeforms, mostly bacteria, that thrive in extreme conditions), I personally think some forms of life might not even need liquid water. Then again, this is all speculation.<p>It's incredibly unlikely that we're alone in the universe. That makes it more interesting why we haven't found any extraterrestial life yet.