The deep sea vents providing electricity differences sounds pretty important, so I guess that would make Mars and Venus less likely (I've never heard anyone dis

The deep sea vents providing electricity differences sounds pretty important, so I guess that would make Mars and Venus less likely (I've never heard anyone discuss deep sea vents in their oceans, and neither is all that tectonically active, so maybe they couldn't have many?), but makes Europa more likely - it's nothing but ocean, and super-tectonically active.