Recorded January 8, 2004, at NASA Ames Research Center, Moffett Field, Calif.
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9.“Why does the Martian soil look muddy where the MER airbags contacted the ground?” (1:02 MINUTES)
Jeff Moore: "The slick, mud-like looking appearance of disturbed ground where the airbags, umm, have been dragged across the surface as they were pulled up underneath the lander is probably due to a combination of two things – that beneath the rocks there’s probably a layer of very fine grain dust storm fallout which has basically the same consistency and particle size as talcum powder or flour. And just as you can . . . you can do this experiment at home. You can take flour or talcum powder and dump it on the kitchen table and smooth it with your hands or knife or something and it will make that same sort of silky, compact, umm, mud-like looking texture that you see in the pictures on Mars. That in combination probably with some electrostatic forces holding the little clay-size particles together all work in concert to produce that sort of appearance.”Multimedia Archive | MER Missions with Jeff Moore