This chapter is dedicated to H. Jay Melosh who tragically passed away during this endeavor. From his earliest publications on the concept of acoustic fluidization, to the publication of his landmark book Impact Cratering—A Geologic Process in 1989, to his latest contributions to the paper by Trowbridge et al. (2020) cited herein on understanding of the South Pole-Aiken basin, Jay’s contributions to the understanding of the impact cratering process, and planetary surface processes in general, are unparalleled. His passing leaves a huge void in the community and he will be sorely missed.

Impact craters are the Moon’s quintessential landform. First...

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