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Critics questioned that age estimate, and scientists revised the date to at least 900,000 years old after using a complex technique called cosmogenic nuclide dating.

He used a technique called cosmogenic nuclide dating, which estimates the amount of time rocks have been buried by analyzing particles created when materials are exposed to radiation from space.

“This is a short-lived nuclide that only exists in the early solar system,” says Noriko Kita, an expert in meteorite aging from the University of Wisconsin-Madison.

A nuclide is an atomic nucleus.

After collecting rock samples in the field, we will ship them back to the Cosmogenic Nuclide Laboratory at the Lamont-Doherty Earth Observatory of Columbia University, where the samples will undergo chemical processing under the guidance of Professor Joerg Schaefer, who is a lead investigator on this Bhutan project.