How do we date something as old as the Earth?

By Amalyah Hart
Updated February 11 2022 - 4:53am, first published 3:30am
How do scientists know how old the Earth is? Picture: Shutterstock.

How do you know that it was 4.6 billion years ago that the Earth formed? That seems a very specific number to be confident about! As compared with saying estimated to be around 5 billion years.

- Asked by David

It's a question humans have grappled with for centuries - how old is the Earth?

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