Ganymede might have ice and oceans like a ‘club sandwich’

Image of Ganymede’s anti-Jovian hemisphere taken by the Galileo probe. Lighter surfaces, such as in recent impacts, grooved terrain and the whitish north polar cap at upper right, are enriched in water ice. Credit: NASA

The largest moon in our Solar System, a companion to Jupiter named Ganymede, might have ice and oceans stacked up in several layers like a club sandwich, according to new NASA-funded research that models the moon’s makeup. Previously, the moon was thought to harbor a thick ocean sandwiched between just two layers of ice, one on top and one on bottom.

More at JPL: Ganymede May Harbor ‘Club Sandwich’ of Oceans and Ice

arXiv: A Passive Probe for Subsurface Oceans and Liquid Water in Jupiter’s Icy Moons

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NASA Jet Propulsion Laboratory California Institute of Technology