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Spirit contained a rock abrasion tool and was able to drill into 15 different rock samples and analyze them.
Five years after this image was taken by Spirit in 2005, NASA scientists concluded that this area showed a past that was wet and non-acidic and could potentially sustain life as we know it. The rocks were identified as magnesium iron carbonate with a 10x higher concentration of carbonate that ever seen on Mars. NASA say "Carbonates originate in wet, near-neutral conditions, but dissolve in acid."
A look at Husband Hill, the 269-foot peak climbed by Spirit.