Radioactive traces in tree rings reveal Earth’s history of ‘radiation storms’

Mitch Marner, Toronto Maple leafs
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Searching for planets and studying their stars, I have had the privilege of using some of the largest telescopes in the world. However, our team recently turned to an even larger system to study the cosmos: Earth’s forests.

We’ve analyzed radioactive signatures left in tree rings around the world to study the mysterious “radiation storms” that have swept across the Earth half a dozen times over the past 10,000 years or so.

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