This March 22, 2014, self-portrait of NASAs Mars Exploration Rover Opportunity shows the effects of wind events that had cleaned much of the accumulated dust off the rovers solar panels.
Credit: NASA/JPL-Caltech
Mars Exploration Rover Opportunity has been exploring the Martian surface for over a decade, an amazing 10 years longer than the 3-month primary mission it began in January 2004.
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