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A comment on Researchers identify largest ever solar storm in 14,300-year-old tree rings. Parent comment

Re:Researchers identify largest ever solar storm in 14,300-y... by schrectacular on Thursday October 19, 2023 @08:59PM (#37950945)
It's called "Dendrochronology" and this is exactly how it is done. In the Northern Hemisphere they can date back at least 13,910 years.
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