LONDON (Reuters) - 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.
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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