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The ice shell and subsurface ocean on icy worlds are strongly coupledtogether -- heat and salinity flux from the ice shell induced by the icethickness gradient drives circulation in the ocean, and in turn, the heattransport by ocean circulation shapes the ice shell. Since measurements in thenear future are likely to remain constrained to above the ice shell,understanding this ocean-ice interaction is crucial. Using an ocean box modeland a series of experiments simulating the 2D ocean circulation, we find thatlarge icy moons with strong gravity tend to have stronger ocean heat transportunder the same ice-shell topography. As a result, the equilibrium ice shellgeometry is expected to be flatter on moons with larger size, and vice versa.This finding is broadly consistent with the observed ice shell geometry forEnceladus and Europa.

In icy ocean worlds, size matters!