Ice Cores Could Solve Cosmic Ray Mystery

Ice Cores Could Solve Cosmic Ray Mystery
AP Photo/Brennan Linsley

New evidence confirms that an influx of cosmic rays struck the entire planet around 994 CE—and it might solve the mystery of the event's origin.

Ice cores and tree rings around the world show mysterious increases in the concentrations of certain elements around 994 CE. The newest evidence originates in Antarctic ice, validating the prior observations and suggesting that the cosmic rays came from the Sun.

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