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How did scientists figure out the ages of the Earth and the universe?

Four and a half billion years old, apparently ... the Earth.
Four and a half billion years old, apparently ... the Earth. Photograph: HO/AFP/Getty Images

How are the estimates of the ages of a) the Earth and b) the universe derived?

RJ Jarrett, London SE26

Post your answers – and new questions – below or email them to nq@theguardian.com

This article titled "How did scientists figure out the ages of the Earth and the universe?" was written by , for The Guardian on Wednesday 3 January 2018 03.00pm

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