from Part II - Key Results from Dawn’s Exploration of Vesta and Ceres
Published online by Cambridge University Press: 01 April 2022
The Dawn mission revealed that Ceres’ interior underwent partial differentiation and aqueous alteration, probably in its early history. The dwarf planet also preserved brines until present, at least on a regional scale. This chapter addresses the various processes involved in shaping Ceres’ interior based on the Dawn observations and knowledge gained from the analysis of carbonaceous chondrites and from observations of other icy worlds. The Dawn results highlight the importance of better understanding the extent of the feedback between geophysical and chemical evolution in ice-rich bodies. In particular, brines produced as a consequence of aqueous alteration can drive geological activity and the transfer of material from the deep interior to the surface. The four main evolution pathways proposed to explain Ceres’ current state are assessed against observational constraints. Most of these models offer explanations for the presence of deep brines below Ceres’ crust. However, uncertainties in the density of Ceres’ mantle and the extent of the brine reservoir prevent converging on the most likely evolutionary path. Altogether, the knowledge gained at Ceres can be applied to other icy worlds, and in particular to dwarf planets and icy moons with limited tidal heating.
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