Why Mars rover is spending so much time pondering a scoop of dirt
The slow testing of the scoop samples is in an effort to make sure that the rover's systems are scrubbed clean of all potential Earth residues.
Thu, Oct 11 2012 at 10:30 AM
This photo, taken by the Curiosity rover's ChemCam shows an extremely close-up shot of the bit of plastic (in the left hand side of the picture) that fell off the rover. (Photo: NASA)
NASA's Mars rover Curiosity will resume working with its first scoop of Red Planet dirt on Oct. 10 after taking a few days off to study an odd scrap of detritus on the ground, NASA officials said.
Curiosity scooped up the sandy soil on Oct. 7 to test out — and clean out — the sampling system at the end of its 7-foot (2.1 meters) robotic arm. But work with the soil was put on hold after mission scientists noticed a strange bright object lying near the scoop location.
The 1-ton rover took some close-up shots of the mysterious shard on Oct. 8, allowing the team to determine that it's likely some type of plastic wrapping material, such as the sort that might go around a wire.
The plastic may have fallen onto Curiosity from the rover's sky crane descent stage, which lowered the huge robot onto the Martian surface on the night of Aug. 5, researchers said.
Curiosity's sampling system is designed to deliver bits of soil and pulverized rock into two instruments on the rover's body known as SAM (Sample Analysis at Mars) and CheMin (Chemistry & Mineralogy). SAM and CheMin are two of the main tools Curiosity will use to determine if Mars could ever have supported microbial life.
The scoop won't make it into these instruments, however, and neither will the next scoop Curiosity snags. The first two samples will be vibrated vigorously inside the sampling system and then discarded, to ensure that the system is scrubbed clean of all Earth-originating residues, researchers have said.
After finishing its activities with the first scoop, Curiosity may take some more time to investigate the plastic material before grabbing scoop number two, NASA officials said.
The $2.5 billion Mars rover Curiosity landed inside the Red Planet's huge Gale Crater on Aug. 5 and is expected to spend the next two years or more roving about its Martian environs. The six-wheeled robot currently sits at a spot called "Rocknest" about 1,300 feet (400 meters) from its landing site as the crow flies.
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