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From SPACE.com:
Many space missions use robots to explore. The rovers Spirit and Opportunity are still travelling around Mars, taking pictures and digging in the dirt. But could a robot identify alien life? How would a machine know the difference, for instance, between a rock and bacteria?
Hoping to answer this question, a group of scientists led by Derek Pullan of the University of Leicester used robotic explorer instruments to examine rocks here on Earth. To make their tests as realistic as possible, the researchers collected rock samples similar to what we'd find on Mars and then studied them with high-tech equipment.
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