Jupiter's Moon Gannymede

More details below:
Size & Distance
Size.jpg

* the largest moon in our solar system and the only moon with its own magnetic field.

* the only moon in our solar system bigger than the planet Mercury.

* Ganymede is 2.4x smaller than Earth.                   Circumference 10,272 miles. (Earth's Data)

Geology
Geode.jpg

* Ganymede has three main layers. A sphere of metallic iron at the center (the core, which generates a magnetic field), a spherical shell of rock (mantle) surrounding the core, and a spherical shell of mostly ice surrounding the rock shell and the core.

 

* The ice shell on the outside is very thick, and about 500 miles (800 kilometers) thick.

 

* The surface is the very top of the ice shell. Though it is mostly ice, the ice shell might contain some rock mixed in.

 

* Ganymede's magnetic field is embedded inside Jupiter's massive magnetosphere.

* The subterranean ocean is thought to have more water than all the water on Earth's surface.

Atmosphere / Weather
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* magnetic field causes auroras, which are ribbons of glowing, electrified gas, in regions circling the moon’s north and south poles. (see illustration below)

Jupiter with Gannymede.jpg
For a yet more interactive and in-depth look at the moon click on this NASA link.... https://solarsystem.nasa.gov/moons/jupiter-moons/ganymede/in-depth/
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Credit NASA