![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEje01OJhxwcZtEU5IWjzWV8nk-dVH-yHOq5HFBPPxA_t-vPNVPGi4vZQYMeyyEDxWdW-AB5XtXf2yHIVPu4n9g8u2Ety_rsFF4Lk_49x3yfULOB9zcWfWDKm9LwGqnWkrolqZoxMA/s320/ne_213.jpg)
The Mars Phoenix Lander optical microscope captured these photos of dust and sand grains, as small as one-tenth the diameter of a human hair. A translucent grain was identified as a possible salt. [photo, NASA/JPL, UA, Max Planck Inst.]
blog of the State Geologist of Arizona
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