Phoenix Scrapes Up Water Ice Samples

By Andrea Thompson
published

Phoenix Scrapes Up Water Ice Samples
This image taken by Phoenix's Robotic Arm Camera on Sunday, June 29, shows the trench known as "Snow White 5." The trench is about 1.5-to-1.9 inches (4-to-5 centimeters) deep, about 9 inches (24 centimeters) wide and 13 inches (33 centimeters) long. Snow White 5 is located in a patch of Martian soil near the center of a polygonal surface feature, nicknamed "Cheshire Cat." The digging site has been named "Wonderland." (Image credit: NASA/JPL-Caltech/University of Arizona/Max Planck Institute)

NASA'sPhoenix Mars Lander scraped up some icy soil to analyze in its instruments,NASA announced on Tuesday.

OnSaturday, the lander's 33rd Martian day, or sol, on the red planet, Phoenixenlarged the "Snow White" trench in the so-called Wonderland area.Two days earlier, the spacecraft dug downto the hard icy layer beneath the subsurface dirt with its robotic arm.

It thenused the rasp on the scoop at the end of the arm to make 50 scrapes in the iceand then heaped the scrapings into little piles each with about two to fourteaspoonfuls of ice. The scraping created a grid in the icy layer about 0.08inches (2 millimeters) deep.

On Sunday,mission scientists used the craft's Surface Stereo Imager to viewthe scrapings and agreed that they were ideal representatives of theboundary between dirt and ice.

Mission controllers commanded thespacecraft to scoop up some of the scrapings for analysis in the lander'sinstruments. Phoenix will first sprinkle some of the material into the Thermaland Evolved-Gas Analyzer (TEGA), which bakes surface samples and analyzes theircomposition. TEGA is especially sensitive to the signature of water and candetermine the melting point of ice.

Byanalyzing these samples from the Martian surface, scientists hope to determinewhether the water ice near the planet's north pole may once of have beenliquid, possibly creating a habitable zone for Martian microbial life.

 

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Andrea Thompson
Andrea Thompson
Contributor

Andrea Thompson is an associate editor at Scientific American, where she covers sustainability, energy and the environment. Prior to that, she was a senior writer covering climate science at Climate Central and a reporter and editor at Live Science, where she primarily covered Earth science and the environment. She holds a graduate degree in science health and environmental reporting from New York University, as well as a bachelor of science and and masters of science in atmospheric chemistry from the Georgia Institute of Technology.