Valles Marineris is one of the biggest canyons in the Solar System, with a depth of over four times that of the Grand Canyon and a length that exceeds the distance from coast to coast of the United States.
Credit: NASA
Valles Marineris is one of the biggest canyons in the Solar System, with a depth of over four times that of the Grand Canyon and a length that exceeds the distance from coast to coast of the United States.
Credit: NASA