NASA debunks rumors of new evidence of life on Mars, but its Curiosity rover continues to make many smaller discoveries. Some of NASA's latest images raise interesting questions.
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Curiosity's robotic arm dug up five scoops of dirt, creating the "bite marks" that are visible in this image. The first scoop was collected on Oct. 7 and the last one two days later. The first two samples were used to "scrub" the inside of the chambers of the robotic arm's sample-handling mechanism, while the remaining scoops were analyzed by the rover's Chemistry and Mineralogy instrument. There had been some speculation that these soil samples had resulted in a discovery of great scientific significance, but NASA says the rumors are false. Credit: NASA
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