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Home A grid of small polygons on the Martian rock surface near the right edge of this view may have originated as cracks in drying mud more than 3 billion years ago. Multiple Dec. 20, 2016, images from the Mastcam on NASA’s Curiosity Mars rover were combined for this view of a rock called “Squid Cove.” (NASA/JPL-Caltech/MSSS) A grid of small polygons on the Martian rock surface near the right edge of this view may have originated as cracks in drying mud more than 3 billion years ago. Multiple Dec. 20, 2016, images from the Mastcam on NASA's Curiosity Mars rover were combined for this view of a rock called "Squid Cove." (NASA/JPL-Caltech/MSSS)

A grid of small polygons on the Martian rock surface near the right edge of this view may have originated as cracks in drying mud more than 3 billion years ago. Multiple Dec. 20, 2016, images from the Mastcam on NASA’s Curiosity Mars rover were combined for this view of a rock called “Squid Cove.” (NASA/JPL-Caltech/MSSS)

A grid of small polygons on the Martian rock surface near the right edge of this view may have originated as cracks in drying mud more than 3 billion years ago. Multiple Dec. 20, 2016, images from the Mastcam on NASA's Curiosity Mars rover were combined for this view of a rock called "Squid Cove." (NASA/JPL-Caltech/MSSS)

A grid of small polygons on the Martian rock surface near the right edge of this view may have originated as cracks in drying mud more than 3 billion years ago. Multiple Dec. 20, 2016, images from the Mastcam on NASA’s Curiosity Mars rover were combined for this view of a rock called “Squid Cove.” (NASA/JPL-Caltech/MSSS)

This view of a Martian rock slab called “Old Soaker,” which has a network of cracks that may have originated in drying mud, comes from the Mast Camera (Mastcam) on NASA’s Curiosity Mars rover. It was taken on Dec. 20, 2016. The slab is about 4 feet long.