This is an image of Valles Marineris, a canyon on Mars. Also the largest canyon in the Solar System. It is approximately 3000 km long, 600 km across, and 8 km deep. To put that into perspective, the grand canyon in the United States is 800 km long, 30 km across, and 1.8 km deep. Scientists are still unsure of how the canyon formed, but they hypothesize that it was started as a crack on the planet that cooled billions of years ago. Just by looking at this image of the planet, it is obvious that the canyon is extremely large, as it is visible from space.
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