PIA02915: Tracking Boulders
 Target Name:  Mars
 Is a satellite of:  Sol (our sun)
 Mission:  Mars Global Surveyor (MGS)
 Spacecraft:  Mars Global Surveyor Orbiter
 Instrument:  Mars Orbiter Camera (MOC)
 Product Size:  2048 x 3584 pixels (w x h)
 Produced By:  Malin Space Science Systems
 Producer ID:  MOC2-1400
 Full-Res TIFF:  PIA02915.tif (7.347 MB)
 Full-Res JPEG:  PIA02915.jpg (769.7 kB)

Click on the image above to download a moderately sized image in JPEG format (possibly reduced in size from original)

Original Caption Released with Image:

13 March 2006
This Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) image shows a portion of a trough in the Sirenum Fossae region. On the floor and walls of the trough, large -- truck- to house-sized -- boulders are observed at rest. However, there is evidence in this image for the potential for mobility. In the central portion of the south (bottom) wall, a faint line of depressions extends from near the middle of the wall, down to the rippled trough floor, ending very near one of the many boulders in the area. This line of depressions is a boulder track; it indicates the path followed by the boulder as it trundled downslope and eventually came to rest on the trough floor. Because it is on Mars, even when the boulder is sitting still, this once-rolling stone gathers no moss.

Location near: 29.4S, 146.6W
Image width: ~3 km (~1.9 mi)
Illumination from: upper left
Season: Southern Summer

Image Credit:
NASA/JPL/Malin Space Science Systems

Image Addition Date:
2006-03-13