Figure 1: The depth to diameter ratio of craters smaller than a certain size is a constant, as predicted by the Maxwell Zmodel. Below a break point (10 km for the Moon), the ratio follows a power law, decreasing as size increases [Hiesinger, 2006, Sharpton, 1994]. Source: [Hiesinger, 2006]. The uniformity of the phenomena suggests that there are two excavation processes, one for features with a...