Fig. 1: Schematic of simulated crustal structures.
From: An ancient and impure frozen ocean on Ceres implied by its ice-rich crust
a, A uniform crust, 40 km thick. b, A two-layer crust, where the top layer is icier than the bottom layer. Each layer is 20 km in our simulations. c, The gradational crust, in which the ice content decreases linearly with depth. The uniform crust in a would need to be more impurity rich than the top layer and more ice-rich than the bottom layer of b for both scenarios to match Dawn gravity inversions. The composition gradient in c depends on the ice content in the near subsurface to match gravity inversions.
