A few years ago, I attended a talk about the Mars rovers, where the speaker (Steve Squyres) mentioned that there was a time when one of the rovers had accumulat

A few years ago, I attended a talk about the Mars rovers, where the speaker (Steve Squyres) mentioned that there was a time when one of the rovers had accumulated so much dust on its solar panels that it was in danger of dying. When hopes were fading away for a solution, the rover experienced a few days of strong wind, which cleared off most of the dust, increasing power output 9 fold!