While driving eastward toward the northwestern flank of "McCool Hill," the
wheels of NASA's Mars Exploration Rover Spirit churned up the largest
amount of bright soil discovered so far in the mission. This image from
Spirit's panoramic camera (Pancam), taken on the rover's 788th Martian
day, or sol, of exploration (March 22, 2006), shows the strikingly bright
tone and large extent of the materials uncovered.
Several days earlier, Spirit's wheels unearthed a small patch of
light-toned material informally named "Tyrone." In images from Spirit's
panoramic camera, "Tyrone" strongly resembled both "Arad" and "Paso
Robles," two patches of light-toned soils discovered earlier in the
mission. Spirit found "Paso Robles" in 2005 while climbing "Cumberland
Ridge" on the western slope of "Husband Hill." In early January 2006, the
rover discovered "Arad" on the basin floor just south of "Husband Hill."
Spirit's instruments confirmed that those soils had a salty chemistry
dominated by iron-bearing sulfates. Spirit's Pancam and miniature thermal
emission spectrometer examined this most recent discovery, and researchers
will compare its properties with the properties of those other deposits.
These discoveries indicate that salty, light-toned soil deposits might be
widely distributed on the flanks and valley floors of the "Columbia Hills"
region in Gusev Crater on Mars. The salts, which are easily mobilized and
concentrated in liquid solution, may record the past presence of water. So
far, these enigmatic materials have generated more questions than answers,
however, and as Spirit continues to drive across this region in search of
a safe winter haven, the team continues to formulate and test hypotheses
to explain the rover's most fascinating recent discovery.
This stereo view combines images from the two blue (430-nanometer) filters
in the Pancam's left and right "eyes." The image should be viewed using
red-and-blue stereo glasses, with the red over your left eye.
