article_snippet.sent: For example, scientists using Nasa’s Hubble Space Telescope recently provided powerful evidence that Jupiter’s moon Ganymede has a saltwater, sub-surface ocean, likely sandwiched between two layers of ice.
article_snippet.sent: Signs of an underground ocean on Europa can be seen in the lines that are strewn across an underground ocean on Europa surface.
article_snippet.sent: Jupiter’s moon Ganymede, meanwhile, has layers of water and ice below Jupiter’s moon Ganymede surface .
article_snippet.sent: Scientists using Nasa’s Hubble Space Telescope recently provided powerful evidence that Jupiter’s moon Ganymede Jupiter’s moon Ganymede has a saltwater, sub-surface ocean, likely sandwiched between two layers of ice.
article_snippet.sent: The water forms because the moon is pushed and pulled by the gas giant Jupiter .
article_snippet.sent: Here the lines across Europa's surface can be seen, likely caused by the icy surface cracking due to the motion of water underground .
article_snippet.sent: On its surface, Callisto is a barren world covered in craters, but underground Callisto might also have an underground ocean.
article_snippet.sent: Water on worlds like Jupiter’s moon Ganymede forms through tidal heating; Water on worlds like Ganymede forms through tidal heating orbit around Jupiter is not perfectly circular, so its orbit around Jupiter is pushed and pulled by the planet’s gravity, melting ice beneath its orbit around Jupiter .