NASA's Mars rover Opportunity has reached the main destination of its current two-year extended mission -- an ancient fluid-carved valley on the inner slope of a crater rim.
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NASA's Mars rover Opportunity has reached the main destination of its current two-year extended mission -- an ancient fluid-carved valley on the inner slope of a crater rim.
NASA/Aubrey Gemignani NASA astronauts Frank Rubio , center, and Marcos Berrios , right, share a laugh with staff during a White Ho...
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