Interestingly, nearly half of the samples collected by the Curiosity rover from five different locations had surprisingly high levels of carbon12 compared to what has been observed in the Martian atmosphere and in meteorites.
"We have to understand whether the same explanation works for Mars, or if there are other explanations because Mars is very different," said Christopher House, a Curiosity scientist based at Penn State who led the carbon study.
A major reason for the study of carbon is that this element is found throughout all living things on Earth; it moves continuously through the air, water, and soil in a cycle that its isotopes can measure.
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Written by Thea Felicity
