Believed to be a remnant of powerful ancient debris flows, Gediz Vallis Ridge is a destination long sought by the rover’s science team. Three billion years ago, amid one of the last wet periods on Mars, powerful debris flows carried mud and boulders down the side of a hulking mountain. The debris
the mission has ever faced, Curiosity arrived on August 14 at an area where it could study the long-sought ridge with its 7-foot robotic arm.
Mount Sharp rises about 3.4 miles above the floor of Gale Crater. This oblique view of Mount Sharp, is derived from a combination of elevation and imaging data from three Mars orbiters. The view is looking toward the southeast. Gale Crater is 96 miles in diameter. Credit: NASA/JPL-Caltech/ESA/DLR/FU Berlin/MSSSThe rover spent 11 days at the ridge, busily snapping photos and studying the composition of dark rocks that clearly originated elsewhere on the mountain.
The rover’s arrival at the ridge has also provided scientists the first up-close views of the eroded remnants of a geologic feature known as a debris flow fan, where debris flowing down the slope spreads out into a fan shape. Debris flow fans are common on both Mars and Earth, but scientists are still learning how they form.
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