Many of the moons of our solar system are icy bodies, and, among them, there are several that have been shown to likely contain subsurface oceans. Though Earth itself is an ocean world, this section is primarily for considering icy moons (including those with oceans). However, there will be comparisons to Earth and other potential worlds with surface oceans.
Hypothesis (less than 255 characters):
Counterhypothesis (less than 255 characters):
Background for the hypothesis: (max 1000 characters)