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Old 12-06-15, 05:46 PM   #3
Xringer
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Just check out the specs on that hole..

Valles Marineris: Facts About the Grand Canyon of Mars

"Valles Marineris is a system of canyons that spans 2,500 miles (4,000 kilometers). At some points, the canyon is 125 miles (200 km) wide. Regions can reach depths of 6 miles (10 km). "

http://www.esa.int/images/valles_3d_H.jpg

It's a monster! And, the theory is... Wait for it.. It was blasted out, by an electric arc!
And it didn't take all day either..
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