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NASA's Phoenix Lander Has an Oven Full of Martian Soil

12.06.2008
"We have an oven full," Phoenix co-investigator Bill Boynton of the University of Arizona, Tucson, said today. "It took 10 seconds to fill the oven. The ground moved."

Boynton leads the Thermal and Evolved-Gas Analyzer instrument, or TEGA, for Phoenix. The instrument has eight separate tiny ovens to bake and sniff the soil to assess its volatile ingredients, such as water.

The lander's Robotic Arm delivered a partial scoopful of clumpy soil from a trench informally called "Baby Bear" to the number 4 oven on TEGA last Friday, June 6, which was 12 days after landing.

A screen covers each of TEGA's eight ovens. The screen is to prevent larger bits of soil from clogging the narrow port to each oven so that fine particles fill the oven cavity, which is no wider than a pencil lead. Each TEGA chute also has a whirligig mechanism that vibrates the screen to help shake small particles through.

Only a few particles got through when the screen on oven number 4 was vibrated on June 6, 8 and 9.

Boynton said that the oven might have filled because of the cumulative effects of all the vibrating, or because of changes in the soil's cohesiveness as it sat for days on the top of the screen.

"There's something very unusual about this soil, from a place on Mars we've never been before," said Phoenix Principal Investigator Peter Smith of the University of Arizona. "We're interested in learning what sort of chemical and mineral activity has caused the particles to clump and stick together."

Plans prepared by the Phoenix team for the lander's activities on Thursday, June
12 include sprinkling Martian soil on the delivery port for the spacecraft's Optical Microscope and taking additional portions of a high-resolution color panorama of the lander's surroundings.

The Phoenix mission is led by Smith with project management at JPL and development partnership at Lockheed Martin, located in Denver. International contributions come from the Canadian Space Agency; the University of Neuchatel, Switzerland; the universities of Copenhagen and Aarhus, Denmark; Max Planck Institute, Germany; and the Finnish Meteorological Institute.

Lori Stiles | University of Arizona
Further information:
http://www.arizona.edu
http://phoenix.lpl.arizona.edu
http://www.nasa.gov/phoenix

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