Martian Cleaners

Something -- or someone -- is regularly cleaning the US space rover on Mars, Opportunity.
The cleaning had boosted the panels' power output close to their maximum 900 watt-hours per day after at one stage dropping to 500 watt-hours because of the heavy Martian dirt.

By contrast, the power output of the solar panels of Mars Spirit - on a different part of the Red Planet - had dropped to just 400 watt-hours a day, clogged by the heavy dust.

"These exciting and unexplained cleaning events have kept Opportunity in really great shape," the magazine quoted Nasa rover team leader Jim Erickson as saying.

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