Earth's atmosphere appears to have only a fraction of the inert gas xenon, but researchers at Jilin University in Changchun, China, think they've found where the rest of it is hidden. "Earth's core is a natural reservoir for xenon," said researcher Yanming Ma. Using a computer model, scientists looked at xenon's reactivity, which would not normally react with iron, the bulk of Earth's core. But at the extreme pressures and temperatures at the center of Earth, xenon and iron appear to be attracted to each other.

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