Photo: composite image looking toward the higher regions of Mount Sharp on Mars, taken 9 September 2015 by NASA/JPL’s Curiosity rover.
Note the colors were adjusted so that rocks look approximately as they would if they were on Earth, to help geologists interpret the rocks. This “white balancing” to adjust for the lighting on Mars overly compensates for the absence of blue on Mars, making the sky appear light blue and sometimes giving dark, black rocks a blue cast.
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