Ganymede, Jupiter's Largest Moon, Shows Youth

​​Jupiter has over 60 moons in orbit around this large gaseous planet. Its largest moon, Ganymede, is slightly larger than planet Mercury. Ganymede has three main layers, including a sphere of metallic iron at the center core, which generates a magnetic field. A spherical shell of rock (mantle layer) surrounds the core, and a spherical shell of mostly ice surrounding the rock shell and the core. In addition to its strange and unique surface filled with long grooves and craters, Ganymede was previously predicted by evolutionists to have no magnetic field. However, the NASA Galileo spacecraft took measurements of Ganymede and confirmed that it does have a magnetic field. Ganymede is one of the few moons in the solar system to have its own magnetic field. Yet it is difficult for evolutionists to explain how a planetary body the size of Ganymede has maintained a magnetic field for billions of years. Particularly with its small core, there should not be enough heat to supply the magnetic field with an electric current for billions of years according to the evolutionist's dynamo model. Ganymede also has a slow rotation rate, which hurts the ability to produce a dynamo process in the core where fluid material would be needed to produce an electric current through convection that continually sparks the magnetic field over billions of years. The creationist model explains that the magnetic field of Ganymede has gradually weakened over its 6,000 year history and will eventually disappear.

Bland, M.T., Showman, A.P. and Tobie, G., The production of Ganymede’s magnetic field, Icarus 198:384–399, 2008.
Ganymede: the surprisingly magnetic moon. Journal of Creation 23(1):8–9—April 2009.
Ganymede. https://solarsystem.nasa.gov/moons/jupiter-moons/ganymede/in-depth/