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Ganymede is the largest moon, and one of the four Galilean moons of the planet Jupiter.
If it turns out to be real, this salty subsurface sea could have more than all the water on Earth's surface. Ganymede is larger than the planets Mercury and Pluto, and 2/3 the size of Mars. Ganymede is the largest of moons in the Solar system. Ganymede has an iron-rich, liquid core, followed by a layer of rock. The rock shell is mostly surrounded by the ice. But understanding the ocean will be one of the primary objectives of the European Space Agency's billion-pound Juice robot when it arrives at Ganymede in 2030. The ice shell is very thick, measuring up to almost 800 km. That’s astonishing. The surface of the Moon is the very top of the ice shell.
They also think that Ganymede has at least one (or more) oceans as well. Cassini Finds Likely Subsurface Ocean on Saturn Moon. There is a hypothesis about the oceans beneath the ice on these satellites, which is supported by various observational data and simulation results. This artist's concept shows a possible scenario for the internal structure of Titan, as suggested by data from NASA's Cassini spacecraft. Yet, for at least two decades, astronomers have suspected that the tiny moon Europa had subsurface oceans.
Like some other satellites of giant planets, Ganymede is globally covered with ice. It would be considered a planet if it were orbiting the Sun instead of Jupiter. Image credit: A. Tavani › Full image and caption › Related animation. Hubble finds 'best evidence' for Ganymede subsurface ocean There is further, compelling evidence that Ganymede - the largest moon in the Solar System - has an ocean of water beneath its icy crust. If so, then it contains more water than all the oceans on Earth! This ocean is probably located about 150 km deep under Ganymede’s surface and may extend another 100 km deeper.
06.28.12 . Radar sounding of the subsurface ocean on Ganymede: model description and numerical simulations. Now, they have strong evidence for a deep saline ocean there.
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