These photos of the Mariner Valleys on Mars show just how vast the canyons and volcanoes are there. The largest valley is the length of the U.S. from the Pacific to the Atlantic Ocean. The main canyon is so wide that if you stood on one side, you wouldn't be able to see the other. [Designyoutrust]
Photos Of The Galaxy's Largest Valley On Mars
It's the length of the entire United States.
Image via Complex Original
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