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Jan 11, 2021, 4:49 am129 pts
The Next Web
Ten times longer than the Grand Canyon, and three times as deep, the Valles Marineris (The Mariner Valley) cuts through the surface of Mars. This grandest canyon in the Solar System stretches 4,000 km (2,500 miles) across the Red Planet — nearly covering a quarter of the circumference of that ruddy world.…
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