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Mars Odyssey's Picture of the Day: Rim of Henry Crater
posted: 01:35 pm ET
02 April 2002
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Untitled Scientists are releasing a picture each weekday from the Mars Odyssey spacecraft. Odyssey's Thermal Emission Imaging System (THEMIS) captures the images as the craft orbits Mars. The photos are not yet fully calibrated for scientific use, and so no science findings are being discussed, said researchers who operate the camera from Arizona State University. Today's picture ... | 
Click to Enlarge
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This portion of the rim of Henry Crater has numerous dark streaks located on the slopes of the inner crater wall. These dark slope streaks have been suggested to have formed when the relatively bright dust that mantles the slopes slides downhill, either exposing a dust-free darker surface or creating a darker surface by increasing its roughness. The topography in this region appears muted, indicating the presence of regional dust mantling. The materials on floor of the crater (middle to lower left) are layered, with differing degrees of hardness and resistance to erosion producing cliffs (resistant layers) and ledges (easily eroded layers). These layered materials may have been originally deposited in water, although deposition by other means, such as windblown dust and sand, is also possible. Henry Crater, named after a 19th Century French astronomer, is 106 miles (170 km) in diameter and is located at 10.9 N, 336.7 W in a region called Arabia Terra.
Image from April 1, 2002 |
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