Wired has a small sampling of the more than 18,500 close up images that the Mars Reconnaissance Orbiter has taken over the last five years using its HiRise camera.
“These twisty trails were traced by dust devils, spinning columns of rising air that pick up loose red dust grains and reveal darker, heavier sand beneath. Dust devils have been blamed for unexpectedly cleaning off the Mars rovers’ solar panels.”
Isn’t it amazing that we have spacecraft on another planet?