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Mars rover captures first close-up photos of giant 'spiderwebs' on the Red Planet

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NASA 's Curiosity Mars rover has taken the first ever close-up images of gigantic Martian "spiderwebs" on the Red Planet .

The web-like features, known as "boxwork," are made up of criss-crossing ridges of mineral-rich rocks that infrequently litter the surface of Mars .

The patterns can span up to 12 miles ( 20 kilometers ) across and look as if they have been spun by giant arachnids when viewed from space.