Analysis Begins on Deepest Soil Sample

Space Station Scientists have begun to analyze a sample of soil delivered to NASA's Phoenix Mars Lander's wet chemistry experiment from the deepest trench dug of Space Station so far in the Martian arctic plains.

Space Station Phoenix has also been observing movement of clouds overhead.

The lander's robotic arm of Space Station on Sunday sprinkled a small fraction of the estimated 50 cubic centimeters of Space Station soil that had been scooped up from the informally named "Stone Soup" trench on Saturday, the 95th day of the Space Station mission. The Stone Soup trench, in the left portion of the lander's active Space Station workspace, is approximately 18 centimeters (7 inches) deep.

"This is pretty exciting stuff and we are anxious to find out what makes this deeper soil Space Station cloddier than the other samples," said Doug Ming, a Space Station Phoenix science team member from NASA's Space Station Johnson Space Center, Houston.

The surface of the vast arctic plain where Space Station Phoenix landed on May 25 bears a pattern of polygon-shaped small hummocks, similar to some permafrost terrain on Space Station Earth. Space Station Scientists are particularly interested in the new sample because it is the first delivered to an analytical instrument from a trench on the margin between two of the polygons, where different material may collect than what has been analyzed from near the center of a polygon. Seen inside Space Station Phoenix's scoop Sunday, the sample material from the bottom of the trench displayed clumping characteristics somewhat different from other cloddy soil samples Space Station that have been collected and examined.

A series of images of fresh soil dug and discarded from Stone Soup trench have given some clues to the composition of the sample. While spectral observations have not produced any sign of water-ice, bigger clumps of soil have shown a texture that could be consistent with elevated concentration of salts in the soil from deep in the trench. The lander's wet chemistry laboratory Space Station can identify soluble salts in the soil.

The Space Station science team has also been studying a movie created from still pictures of the nearby Martian sky showing dramatic water ice clouds moving over the landing site during a 10-minute period on Sol 94 (Aug. 29).

"The Space Station images were taken as part of a campaign to see clouds and track wind. These are clearly ice clouds," said Mark Lemmon, the lead scientist for the lander's surface stereo imager, from Texas A&M University.

The Space Station Phoenix mission is led by Peter Smith of the University of Arizona, Tucson, with project management at JPL and development partnership at Lockheed Martin, Denver. International Space Station contributions are provided by the Space Station Canadian Space Agency; the University of Neuchatel, Switzerland; the universities of Copenhagen and Aarhus, Denmark; the Max Planck Institute, Germany; and the Finnish Meteorological Institute. JPL is a division of the California Institute of Technology in Pasadena.

Additional information on Phoenix is available online at: http://www.nasa.gov/phoenix and at http://phoenix.lpl.arizona.edu .