Martin Jutzi coauthored simulations testing whether the lunar crustal dichotomy could result from accretion of a smaller companion moon. In the proposed low-speed collision, material accumulates on one hemisphere instead of forming the usual high-energy crater.[ref]
Forming the lunar farside highlands by accretion of a companion moon by Martin Jutzi and others. Companion-moon model and simulated accretionary collision
The model connects impact dynamics with crustal thickness and surface relief. It is a proposed formation mechanism to compare with lunar observations and alternative explanations, rather than a direct observation of an ancient second moon.
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