No one is quite sure how this happening, but one of the Mars Rovers (Opportunity) is getting its solar panels cleaned off at night. Did Guiliani send all the squeegee men that far away? :)
An unexplained phenomenon akin to a space-borne car wash has boosted the performance of one of the two U.S. rovers probing the surface of Mars, New Scientist magazine said on Tuesday.
It said something -- or someone -- had regularly cleaned layers of dust from the solar panels of the Mars Opportunity vehicle while it was closed down during the Martian night.
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.
"These exciting and unexplained cleaning events have kept Opportunity in really great shape," the magazine quoted NASA rover team leader Jim Erickson as saying.