It's been all about oceans on moons lately! Plans for a mission to Europa, a moon of Jupiter famous for having global ocean, are being considered by NASA (http://goo.gl/ZuJzfy). Encleadus, a moon of Saturn, most likely has hydrothermal activity in its small ocean which warms the water (http://goo.gl/yZWVtH). Now we have observations that the largest moon in the solar system (it's even larger than the planet Mercury) may have an ocean as well!
NASA’s Hubble Space Telescope has the best evidence yet for an underground saltwater ocean on Ganymede, Jupiter’s largest moon. The subterranean ocean is thought to have more water than all the water on Earth's surface.
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