New way to probe Earth's deep interior proposed

Researchers propose a new technique that might one day reveal in higher detail than ever before the composition and characteristics of the deep Earth. There's just one catch: it relies on a fifth force of nature that has not yet been detected, but which some particle physicists think might exist. If it does, this new force would connect matter at Earth's surface with matter hundreds to thousands of kilometers below, deep in Earth's mantle.

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