Watery Moons Fire Up the Imagination!
Ganymede, the largest moon in our solar system, appears to have a vast subsurface ocean - so large that it might rival the oceans of Earth. However, being insulated from the cold of space, and being warmed by the moon's core, it is likely that water on Ganymede is very very hot. Ganymede orbits Jupiter.
"Follow the Plume"
Europa is also an interesting moon, and appears to have liquid water.
The warmth discovered in these moons also upends the old assumption that most energy comes from our Sun; that is clearly not the case. On Earth we have plants that use Chemosynthesis, instead of Photosynthesis for energy; so it does not appear that a Star is needed for a planetary body to evolve life.
Water in Our Solar System - How Much?
What do you predict?