The black and white photograph shows the desert landscape with high rocky hills in the background.
In front of the larger rock formations, a tiny elongated white blob appears to be streaking past.
NASA has previously admitted to similar anomalies in pictures taken by the probe. This image was taken on 16 June, and while conspiracy theorists have said the photograph is evidence of extra-terrestrials on the Red Planet, it appears more likely to have been a cosmic ray, some kind of camera lens flare or sunlight reflecting on rocks.
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