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The features in the foreground, taken six months after a rain event, resemble a muddy puddle that has dried up.

Evidence of Rare Desert Rain – Atacama Rover Astrobiology Drilling Studies

The Atacama Desert in Chile is one of the driest places on Earth. However, a rare rain event did occur here in August 2017, and the features in the foreground of this photo, resembling a dried-up muddy puddle, suggest that rainwater may have pooled here.

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