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A salty ocean is lurking beneath the surface of Jupiter's largest moon, Ganymede, scientists using the Hubble space Telescope have found. The ocean on Ganymede which is buried under a thick crust of ice could actually harbor more water than all of Earth's surface water combined, according to NASA officials. Scientists think the ocean is about 60 miles (100 kilometers) thick, 10 times the depth of Earth's oceans, NASA added.