The measurements obtained with Curiosity's instruments match up with what's been predicted by both the Viking landers and Martian meteorite studies. Adam Burrows, a professor of astrophysical sciences at Princeton University in New Jersey, says that its the SAM's precision that makes these new findings stand out. "The Viking measurements were very crude. Now, measuring with two different instruments, we get a pretty consistent picture saying that there's been isotopic enrichment," he said.

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