NASA’s Hubble Observations Suggest Underground Ocean on Jupiter's Largest Moon

NASA’s Hubble Observations Suggest Underground Ocean on Jupiter's Largest Moon

03/12/2015 12:00 PM EDT

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