Generally supposing that martian winds have blown dust clear off the probes on mars including the solar panels which power them increasing their energy output.
Spirit opportunity solar panels.
Both were taken by opportunity s panoramic camera pancam.
Sister rover spirit was not able to soldier on for as long as opportunity but it wasn t dust covering its solar panels that killed.
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Launched on july 7 2003 as part of nasa s mars exploration rover program it landed in meridiani planum on january 25 2004 three weeks after its twin spirit mer a touched down on the other side of the planet.
At the end of 2008 a winter storm further reduced the output of spirit s solar panel to about 89 watt hours per martian day.
A cleaning event is a phenomenon whereby dust is removed from solar panels in the context of exploration and science rovers on mars supposedly by the action of wind the term cleaning event is used on several nasa webpages.
Rover opportunity celebrates mars spring power boost.
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Various means of cleaning the panels were discussed with wiper blades being one of the worst but all were deemed unnecessary.
The mission was required to last for 90 sols plus the landing sol about 93 earth days.
In addition the mers spirit and opportunity each carry an array of seven tools for exploring the surface of mars.
Mars exploration rovers spirit and opportunity exploring the planet mars facts information videos and pictures.
Through much of the earth summer of 2007 both spirit and opportunity faced massive dust storms that eroded their ability to operate effectively mainly due to lack of power generated from the solar panels.
Opportunity went quiet during a historic mars wide dust storm in 2018 that reduced the energy available to the rover s solar panels.
The last signal from the spacecraft was heard on june 10 2018.
A self portrait of nasa s mars exploration rover opportunity taken in late march 2014 right shows that much of the dust on the rover s solar arrays has been removed since a similar portrait from january 2014 left.
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Designed to last just 90 martian days and to travel 1 100 yards 1 000 meters opportunity vastly surpassed all expectations in its endurance.