Catastrophic solar storms may not explain shadows of radiation in trees

A cryptic chemical signature of unknown origins, hidden for centuries inside the trunks of Earth’s trees, just became even more mysterious.

In the last decade, scientists have discovered traces on Earth of six intense bursts of radiation, known as Miyake events, scattered over the last 9,300 years. The most popular explanation is that these mysterious signatures were left behind by massive solar storms, leading some scientists to warn that the next Miyake event could cripple the world’s electrical grid. But new research, published in the October Proceedings of the Royal Society A, suggests that more than just solar flares might be behind the enigmatic radiation.

The finding underscores the

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