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Aurorae on Ganymede—auroral belt shifting may indicate a subsurface saline ocean. The permanent magnetic moment carves a part of space around Ganymede, creating a tiny magnetosphere embedded inside that of Jupiter ; it is the only moon in the Solar System known to possess the feature. [ 95 ]
Ganymede is composed primarily of silicate rock and water ice, and a salt-water ocean is believed to exist nearly 200 km below Ganymede's surface, sandwiched between layers of ice. [44] The metallic core of Ganymede suggests a greater heat at some time in its past than had previously been proposed.
A subsurface saline ocean is theorized to exist on Ganymede, a moon of Jupiter, following observation by the Hubble Space Telescope in 2015. Patterns in auroral belts and rocking of the magnetic field suggest the presence of an ocean. It is estimated to be 100 km deep with the surface lying below a crust of 150 km of ice. [23]
Mimas becomes the smallest of five moons in our solar system with compelling evidence of subsurface oceans, alongside Saturn's Enceladus and Titan, and Jupiter's Europa and Ganymede, Lainey said.
subsurface, global c. 30,000,000 est. 50–100 global ocean under 10 to 30 km of ice, perhaps twice the volume of Earth's ocean Ganymede: moon of Jupiter: 35.4 (internal global ocean) salt water? subsurface, global c. 80,000,000 apiece 100 100 km thick, under 150 km of ice, six times the volume of Earth's ocean; [13]
The main science objectives for Ganymede, and to a lesser extent for Callisto, are: [26] Characterisation of the ocean layers and detection of putative subsurface water reservoirs; Topographical, geological and compositional mapping of the surface; Study of the physical properties of the icy crusts
A deep ocean exists beneath the icy, cratered surface of Saturn’s moon Mimas, according to a new analysis of data from NASA’s Cassini mission.
Thought to have a subsurface ocean heated by tidal forces. [41] [42] Ganymede: Jupiter: Ganymede – Subsurface oceans: Thought to have a magnetic field, with ice and subterranean oceans stacked up in several layers, with salty water as a second layer on top of the rocky iron core. [43] [44] Io: Jupiter