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This Breathtaking Close-Up of Mars' 'Grand Canyon' Is Giving Us Goosebumps - ScienceAlert
Jan 11, 2021 33 secs
At a staggering 810 kilometres (503 miles) long, it's a large part of Valles Marineris - the biggest canyon system we know of in the whole Solar System.

The Grand Canyon on Earth – which is five times shallower and 10 times shorter than the Valles Marineris – was carved by the Colorado River.

But scientists aren't sure what would have formed the 8- to 10-kilometre (5 to 6.2 miles) deep canyon of Valles Marineris and Tithonium Chasma, so they've been taking photos to try and find out.

Some researchers suspect a large tectonic "crack" may have split Mars' surface, to be later enhanced by lava flow, or potentially water if the planet's axial tilt was just right. 

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