Valles Marineris
Valles Marineris is the largest canyon in the solar system extending over 3,000 kilometers long and spanning as much 600 kilometers across and delving as much as 8 kilometers deep. The origin remains unknown, although a hypothesis stands that it started as a crack billions of year ago as the planet cooled. This pictured was compiled from over 100 images of Mars taken by Viking Oribiters in the 1970s.
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