This image shows another portion of Ravi Vallis. In this image taken by NASA 2001 Mars Odyssey spacecraft, a small crater and the resistant material formed during the impact form a donut on the floor of the valley.
This image shows another portion of Ravi Vallis. In this image taken by NASA 2001 Mars Odyssey spacecraft, a small crater and the resistant material formed during the impact form a donut on the floor of the valley.