What planetary satellite may have a water ocean under its surface?

Europa, one of Jupiter's moons, exhibits several characteristics indicating the potential presence of a liquid water ocean beneath its icy crust. Europa's surface features, such as cracks, ridges, and chaos terrain, suggest that the icy shell is relatively thin and allows for internal liquid or slushy layers. Scientists believe Europa's composition and interactions with Jupiter's gravitational forces may generate enough heat to sustain subsurface ocean activity and liquid water environments.