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Granular materials are ubiquitous on the Moon and Mars. Their processing depends crucially on environmental conditions and particle properties, which are not known with sufficient certainty to guarantee successful equipment design without trial and error. The safe return of astronauts and their protection demands a deeper understanding of the fine-grained material covering the Martian and lunar landscapes. Shelter construction, spaceport maintenance, and In-Situ Resource Utilization (ISRU) all require reliable processing of massive amounts of granular materials with or without gases. The safe landing of large astronaut-bearing spacecrafts on the Moon and Mars is only feasible if rocket blast, which involves interacting gases and solids, can be mitigated to prevent destruction of craft and nearby equipment (Donahue, Metzger and Immer, 2006). The human exploration of space also brings a convergence of interests between Engineering and Geophysics. An understanding of Martian landslides requires better insight on dynamics of granular materials found at future settlements, such as constitutive relations. Much Martian sedimentary rock is believed to be of volcanic Aeolian origin. Although erosion and dust-lifting mechanisms elicit research on Earth, see for exampl