The trunk of an ancient larch tree lies exposed on the muddy banks of the river Ob in Siberia. (IMAGE)

University of Arizona

The trunk of an ancient larch tree lies exposed on the muddy banks of the river Ob in Siberia.

Caption

The trunk of an ancient larch tree lies exposed on the muddy banks of the river Ob in Siberia. Samples from such trees that lived a long time ago allowed the researchers to search for spikes in radiocarbon documenting extreme solar storms in the distant past.

Credit

Irina Panyushkina, University of Arizona

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