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How the Mars Moon Phobos Got Its Grooves

• arclein
The 3-billion-year-old grooves on Phoboscan be divided into different "families," with each groove plane running parallel to the other grooves within the same family, Murray told The widths of the grooves vary greatly, from 76 feet (23 meters) to 1,558 feet (475 m). Similarly, they come in a large range of lengths — at least one groove stretches for 18.5 miles (30 km) without any breaks, while others are only a little more than 1 mile (1.6 km) long.

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